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MH SET 2023: 26 March, Paper II, Electronic Science

  • Date: 26 March 2023
  • Paper code: MAR-38223
  • Series: A
  • Language: Bilingual
  • 32 pages
MH SET 2023 question paper, 26 March 2023, Paper II, Electronic Science, page 1 of 32
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Test Booklet Code & Serial No.
                                                                                                                     A
                                                ELECTRONIC SCIENCE
Signature and Name of Invigilator                                                          Seat No.
1. (Signature) .........................................
                                                                                                           (In figures as in Admit Card)
      (Name) ................................................
                                                                                  Seat No. ..............................................................
2. (Signature) .........................................                                              (In words)
      (Name) ................................................                 OMR Sheet No.
MAR - 38223                                                                                         (To be filled by the Candidate)
Time Allowed : 2 Hours]                                                                                 [Maximum Marks : 200
Number of Pages in this Booklet : 32                                                     Number of Questions in this Booklet : 100
                      Instructions for the Candidates
1.         Write your Seat No. and OMR Sheet No. in the space provided              1.
           on the top of this page.
2.         This paper consists of 100 objective type questions. Each question
           will carry two marks. All questions of Paper II will be compulsory.      2.
3.         At the commencement of examination, the question booklet
           will be given to the student. In the first 5 minutes, you are            3.
           requested to open the booklet and compulsorily examine it as
           follows :
           (i)      To have access to the Question Booklet, tear off the
                    paper seal on the edge of this cover page. Do not accept                (i)
                    a booklet without sticker-seal or open booklet.
           (ii)     Tally the number of pages and number of questions in
                    the booklet with the information printed on the cover                   (ii)
                    page. Faulty booklets due to missing pages/questions
                    or questions repeated or not in serial order or any
                    other discrepancy should not be accepted and correct
                    booklet should be obtained from the invigilator within
                    the period of 5 minutes. Afterwards, neither the Question
                    Booklet will be replaced nor any extra time will be
                    given. The same may please be noted.
           (iii)    After this verification is over, the OMR Sheet Number
                                                                                            (iii)
                    should be entered on this Test Booklet.
4.         Each question has four alternative responses marked (A), (B),
           (C) and (D). You have to darken the circle as indicated below on         4.                     (A), (B), (C)    (D)
           the correct response against each item.
           Example : where (C) is the correct response.

                              A        B                 D                                           (C)
5.         Your responses to the items are to be indicated in the OMR                                      A        B               D
           Sheet given inside the Booklet only. If you mark at any place
           other than in the circle in the OMR Sheet, it will not be evaluated.     5.
6.         Read instructions given inside carefully.
7.         Rough Work is to be done at the end of this booklet.                     6.
8.         If you write your Name, Seat Number, Phone Number or put                 7.
           any mark on any part of the OMR Sheet, except for the space
                                                                                    8.
           allotted for the relevant entries, which may disclose your
           identity, or use abusive language or employ any other unfair
           means, you will render yourself liable to disqualification.
9.         You have to return original OMR Sheet to the invigilator at the
           end of the examination compulsorily and must not carry it with           9.
           you outside the Examination Hall. You are, however, allowed
           to carry the Test Booklet and duplicate copy of OMR Sheet on
           conclusion of examination.
                                                                                    10.
10.        Use only Blue/Black Ball point pen.
                                                                                    11.
11.        Use of any calculator or log table, etc., is prohibited.
12.        There is no negative marking for incorrect answers.                      12.
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MAR - 38223/II—A




2
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MAR - 38223/II—A
                            Electronic Science
                                    Paper II
Time Allowed : 120 Minutes]                          [Maximum Marks : 200
Note : This Paper contains Hundred (100) multiple choice questions. Each question
       carrying Two (2) marks. Attempt All questions.

1.   Identify the correct expression for        3.   Which one of the following is the
                                                     correct expression for the Fermi-
     the Einstein relation :
                                                     Dirac distribution ?
           µ   KT                                                            1
     (A)
           D    q                                    (A) f (E)         (E E f )/KT
                                                                   e                     1
           D    q                                                            1
     (B)
           µ   KT                                    (B) f (E)         (E f E)/KT
                                                                   e                     1

           µ    q                                                            1
     (C)                                             (C) f (E)         (E E f )/KT
           D   KT                                                  e                     1

         D     KT                                                            1
     (D)                                             (D) f (E)         (E E f )
         µ      q                                                  e              / KT
                                                4.   In the process of photolithography,
2.   Which of the following is/are direct
                                                     an optical stepper is used for the
     band semiconductor/s ?
                                                     exposure of the wafers. Write the
     (1) GaAs                                        correct order of various processes
                                                     starting from the light source to the
     (2) Si
                                                     die on wafer in an optical stepper.
     (3) Ge                                          (1) Illumination diffuser
     (4) InP                                         (2) Condenser lens
                                                     (3) Reficle
     (A) (1) and (4) only
                                                     (4) Interferometer
     (B) (2) and (3) only                            (A) (1), (3), (2), (4)
                                                     (B) (1), (2), (3), (4)
     (C) (1) and (2) only
                                                     (C) (3), (1), (2), (4)
     (D) (2) only                                    (D) (4), (1), (2), (3)

                                            3                                                [P.T.O.
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5.   Wet oxidation is given by :
                                                         8.   Si sample is doped with 1010 arsenic
     (A) Si + O2
                                                              atoms/cm3. What is the equilibrium
     (B) Si + HF

     (C) Si + 2H2O                                            hole concentration p 0 at 300ºK

     (D) Si + H2                                              if intrinsic hole and electron
6.   In, ................. device the conductivity
                                                              concentration n i = 1.5 × 10 10
     of a layer of a semiconductor is
     modulated by a transverse electric                       atoms/cm3 ?
     field.
     (A) BJT                                                  (A) 1.5 × 1010 cm–3

     (B) P-N diode
                                                              (B) 2.25 × 1010 cm–3
     (C) Zener diode

     (D) FET                                                  (C) 3.25 × 1010 cm–3
7.   Which of the following statements
     is correct when the effective mass of                    (D) 4.5 × 1010 cm–3
     an electron is taken into account ?
                                                         9.   After the photoresist pattern is
     (A) Electrons near the top of the
          valence band have negative                          formed, which of the process is
          effective mass
                                                              followed :
     (B) Electrons near the top of the
          valence band have positive                          (A) Oxidation
          effective mass

     (C) Holes near the top of the valence                    (B) Masking
         band have negative effective
          mass                                                (C) Etching

     (D) d 2E/dK 2 is negative at the
         conduction band minima                               (D) Bonding

                                                     4
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10. Match List I with List II and select       11. The Laplace transform of a unit step
    the correct answer using the codes             function is :
    given below :
                                                         1
                                                   (A)
                      List I                             s

    (a) BJT                                        (B) 1

    (b) Tunnel diode                                     1
                                                   (C)
                                                         s2
    (c) Zener diode

                                                             1
    (d) MOSFET                                     (D)
                                                         s a
                  List II
                                               12. Find the power dissipation in the
    (i)   High
                                                   resistor of the following circuit :
    (ii) Voltage regulator

    (iii) Heavily doped diode

    (iv) High input impedance

    Codes :

          (a)   (b)     (c)    (d)
                                                   (A) 100 W
    (A) (iv) (ii)       (iii) (i)
                                                   (B) 0.4 W
    (B) (i)     (iii) (ii) (iv)

    (C) (ii) (iv) (iii) (i)                        (C) 6.25 W


    (D) (i)     (iv) (ii) (iii)                    (D) 25 W

                                           5                                     [P.T.O.
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13. Find the value of VTH using the           15. Match the List I with List II and

    Thevenin’s theorem of the following           select the correct answer using the

    circuit :                                     codes given below :

                                                                     List I

                                                              (Function)

                                                  (a) Impulse

                                                  (b) Pulse

                                                  (c) Sine wave

    (A) 7.92 V                                    (d) DC/constant signal

                                                                  List II
    (B) 8.57 V
                                                        (Fourier Transform)
    (C) 1.71 V
                                                  (i)   Sin C function
    (D) 8.35 V
                                                  (ii) Impulse function at zero
14. Let a system be represented by :
                                                  (iii) Constant function
                s( s 1 j 2) (s 1 j 2)
     F(s)                                         (iv) Impulse function at corresponding
                 ( s 2) (s j1) (s j1)
                                                        frequency
    Identify which one of the following
                                                  Codes :
    do not define a zero ?
                                                        (a)   (b)      (c)    (d)
    (A) 1 – j 2
                                                  (A) (iii) (i)        (iv) (ii)
    (B) 0
                                                  (B) (iii) (ii)       (i)    (iv)
    (C) –2
                                                  (C) (i)     (ii)     (iii) (iv)
    (D) 1 + j 2                                   (D) (ii) (i)         (iv) (iii)

                                          6
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16. For a reciprocal or bilateral two port       18. Z transform of an x(n) is :

     network, which of the following is              (A) X ( a z)

     correct for the shown circuit ?
                                                     (B) X ( a / z)


                                                     (C) X ( z / a)


                                                     (D) X ( zn / an )


                                                 19. For the following circuit, find the

     (A) Z11 = Z22                                   voltage needed across a – b terminal

                                                     so that drop across the 10    resistor
     (B) Z12 = Z21
                                                     is 20 V :
     (C) Z11 = Z12


     (D) Z12 = Z22


17. Fourier transform of eiw0t x(t) is :


     (A) X ( jw0 )
                                                     (A) 20 V
     (B) X ( jw w0 )
                                                     (B) 40 V

     (C) X ( jw), e jw0
                                                     (C) 60 V

     (D) X ( jw)                                     (D) 80 V

                                             7                                     [P.T.O.
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20. State variable analysis is applicable       22. For the triangular wave input to the

    to :                                            circuit as shown in figure the output

                                                    waveform will be :
    (1) LTI systems

    (2) Time varying systems

    (3) Non-linear systems

    Which one of the following is/are

    correct ?                                       (A)


    (A) (1) and (2) only                            (B)

                                                    (C)
    (B) (1), (2) and (3)
                                                    (D)
    (C) (2) and (3)
                                                23. The conventional rectifier works well
    (D) (1) only
                                                    for voltages much larger than 0.7 V.
21. Practical value of loop gain A     is
                                                    Which of the following can be used
    always set slightly higher than 1 to
                                                    for smaller voltages (of the order of
    compensate :                                    few millivolts) :

    (A) Noise                                       (A) Active filter

    (B) Phase shift                                 (B) Precision rectifier

    (C) Non-linearity                               (C) Amplifier

    (D) Change in feedback voltage                  (D) Bridge rectifier

                                            8
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24. Silicon controlled rectifier is a          27. The VCO in a PLL operates over a
    semiconductor device with :
                                                   frequency range between 350 kHz
    (A) 2 junctions                                and 450 kHz. The lock range of the
    (B) 1 junction                                 PLL would be :

    (C) 4 junctions
                                                   (A) 350 kHz
    (D) 3 junctions
                                                   (B) 100 kHz
25. Open loop voltage gain of an
                                                   (C) 450 kHz
    amplifier is 80. When a negative
    feedback of 4% is provided, the gain           (D) 200 kHz
    would be :
                                               28. Which of the following represents
    (A) 16
                                                   the correct sequence in ascending
    (B) 100                                        order of bandwidth ?

    (C) 80
                                                   (A) dc amplifier, audio amplifier,
    (D) 24
                                                       radio amplifier, video amplifier
26. For converting a triangular wave to
                                                   (B) audio amplifier, radio amplifier,
    a wave shape close to a sinusoidal
                                                       dc amplifier, video amplifier
    wave which circuit would be used ?

    (A) Clamper                                    (C) video amplifier, radio amplifier,

    (B) Rectifier                                      audio amplifier, dc amplifier

    (C) Clipper                                    (D) radio amplifier, dc amplifier,

    (D) Integrator                                     audio amplifier, video amplifier

                                           9                                    [P.T.O.
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29. Match List I with List II and select        30. Assertion (A) :
    the correct answer using the codes

    given below the lists :                         Active filters are better than passive


                       List I                       filters in terms of price and

    (a) Oscillator                                  performance.

    (b) Amplifier                                   Reason (R) :

    (c) Active filter
                                                    Integrated circuit technology has
    (d) JFET
                                                    made available cheaper operational
                    List II
                                                    amplifiers.
    (i)   Reverse biased input junction

                                                    (A) Both (A) and (R) are true and
    (ii) Noise rejection

    (iii) Enhanced output                               (R) is the correct explanation

    (iv) Positive feedback                              of (A)

    Codes :                                         (B) Both (A) and (R) are true but

          (a)   (b)      (c)    (d)
                                                        (R) is not the correct explanation

    (A) (i)     (ii)     (iii) (iv)
                                                        of (A)
    (B) (ii) (iv) (i)           (iii)
                                                    (C) (A) is true but (R) is false
    (C) (iii) (i)        (iv) (ii)

                                                    (D) (A) is false but (R) is true
    (D) (iv) (iii) (ii) (i)

                                           10
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31. The Boolean function                      33. A   JKMS       flip-flop   has     the

                                                  characteristic that :
      A (x, y, z) =    (0, 3, 4, 6)
                                                  (A) Change      in   the   input    is
      B (x, y, z) =    (0, 1, 4, 7)
                                                      immediately reflected in the

      C (x, y, z) =    (1, 5)                         output


     D (x, y, z) =     (0, 1, 3, 5, 7)            (B) Change in the output occurs
                                                      when the state of the master is
    can be implemented using a :
                                                      affected

    (A) 4 × 4 ROM                                 (C) Change in the output occurs

    (B) 8 × 2 ROM                                     when the state of the slave is
                                                      affected
    (C) 16 × 2 ROM
                                                  (D) Both the master and the slave
    (D) 8 × 4 ROM                                     states are affected at the same

                                                      time
32. Number of 2-input multiplexers

    required to construct a 210 input         34. A 4-bit ring counter is loaded with

    multiplexer is :                              1000 data and 100 kHz clock input.

                                                  The output at Q0 would be :
    (A) 32
                                                  (A) 50 kHz with 50% duty cycle
    (B) 9
                                                  (B) 25 kHz with 25% duty cycle
    (C) 128
                                                  (C) 50 kHz with 25% duty cycle

    (D) 1023                                      (D) 25 kHz with 50% duty cycle

                                         11                                    [P.T.O.
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35. An 8-bit successive approximation            From figure below at t = 0, the reset

    analog to digital converter has full         switch S 1 opens and a negative

    scale reading of 2.55 V and its              input signal (–v'A) is applied to the

    conversion time for an analog input          integrator. The input signal v'A is

    of 1 V is 20 µS. The conversion time         a sampled portion of the analog

                                                 signal vA and hence is a constant
    for a 2 V input will be :
                                                 during the conversion process. The
    (A) 10 µS
                                                 output v01 of the integrator is a
    (B) 20 µS                                    positive linear signal as shown in the

    (C) 40 µS                                    timing diagram. The slope of the

                                                 signal is proportional to the value
    (D) 50 µS
                                                 of v'A. This portion of the conversion
36–39 : Dual-Slope A/D
                                                 process continues for a fixed time T1,

    Another type of A/D conversion               at which time the counter has

    scheme is the dual-slope A/D                 reached its maximum value and

    converter shown below. This type of          overflows.

    converter is found in high-resolution        At this time, the input switch S2

    data acquisition systems, for                changes to a positive input reference

    example, since 20-bit conversions            voltage VREF. The output of the

    can be achieved.                             integrator starts at the peak output

                                            12
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  voltage reached at T1 and now has           36. The characteristic of the above
  a negative slope. The counter has
                                                  converter is relatively linear
  been reset and is now counting. The
                                                  because :
  counting stops when the output

  voltage v01 reaches zero.                       (A) V01 Vs. T graphs are linear

  The time T2 is related to T1 and v'A            (B) Uses same capacitor for charge
  by :
                                                      and discharge

               vA'
  T2     T1                                       (C) High    performance      linear
              VREF

                                                      comparator


                                                  (D) High performance op-amp


                     v01                      37. The switch S1 is used for the

                                                  following operation :


                                                  (A) Discharge the capacitor at end

                                                      of T1


                                                  (B) Discharge capacitor of residual
v01

                                                      voltage at end of T2


                                                  (C) Starting of A/D operation


                                                  (D) Reset during over flow

                                         13                                    [P.T.O.
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38. The converted output of the ADC                   41. After reset, SP register in 8051 is
    depends upon :                                          initialized to address ............... .
    (A) Value of R
                                                            (A) 8 H
    (B) Value of C
                                                            (B) 9 H
    (C) T 2
                                                            (C) 7 H
    (D) T 1

39. The simple and high resolution ADC                      (D) 6 H
    converter are based on ...................
                                                      42. What is the address range of SFR
    principle.
                                                            Register bank ?
    (A) Flash converter

    (B) Dual slope A/D                                      (A) 00H – 77H

    (C) SAR                                                 (B) 40H – 80H

    (D) Counting                                            (C) 80H – 7FH
40. The    following state         diagram
                                                            (D) 80H – FFH
    represents :
                                                      43. If the .......... pin is ............., then we
                                                            have the option of using the ..........
                                                            ROM or EPROM together with
                                                            ............... memory and devices.

                                                            (A) EA , high, internal, external
    (A) Serial Adder
                                                            (B) EA , low, internal, external
    (B) Shift Register
                                                            (C) EA , high, external, internal
    (C) Serial Parity Checker

    (D) Counter                                             (D) EA , low, external, internal

                                                 14
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44. What is the function of watchdog             46. Pipelining is implemented in 8086
    timer ?                                          with :

    (A) The watchdog timer is an                     (A) Segmented addressing
          external timer that resets the             (B) Queue register in BIU which is
          system if the software fails to                  LIFO
          operate properly                           (C) Queue register in BIU which is
    (B) The watchdog timer is an                           FIFO
          internal timer that sets the               (D) Direct memory access
          system if the software fails to        47. In 8086 which of the following is not
          operate properly                           true ?
    (C) The watchdog timer is an                     (A) Pipelining is implemented
          internal timer that resets the
                                                     (B) Segmented addressing is used
          system if the software fails to
                                                     (C) Co-processor is interfaced in
          operate properly
                                                           minimum mode
    (D) Maintain log of execution
                                                     (D) Consists of Execution unit and
45. Which of the following is of bit                       Bus interface unit
    operations ?                                 48. What is the correct sequence of
    (i)   SP                                         actions while interfacing an ADC
                                                     with microprocessor ?
    (ii) P 2
                                                     (i)   Data ready
    (iii) TMOD
                                                     (ii) Address enable
    (iv) SBUF
                                                     (iii) End of conversion
    (v) IP
                                                     (iv) Start of conversion
    (A) (ii) and (v) only
                                                     (A) (iv), (iii), (ii), (i)
    (B) (ii), (iv), (v) only
                                                     (B) (ii), (iv), (iii), (i)
    (C) (i), (v) only
                                                     (C) (ii), (iii), (i), (iv)
    (D) (iii), (ii) only                             (D) (iii), (ii), (i), (iv)

                                            15                                     [P.T.O.
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49. Match List I with List II and select          50. Assertion (A) :
    the correct answer using the codes
    given below :                                     Chip select is a signal which allows

                      List I                          multiple chips to be connected to the

    (a) TCON                                          database.

    (b) SBUF
                                                      Reason (R) :
    (c) TMOD

    (d) PSW                                           The chip select enables the pins of

    (e) PCON                                          the chip to make transitions between

                  List II                             connected and high impedance

    (i)   contains status information                 states.

    (ii) timer/counter control register
                                                      (A) Both (A) and (R) are true and
    (iii) idle bit, power down bit
                                                          (R) is the correct explanation
    (iv) serial data buffer for Tx and Rx
                                                          of (A)
    (v) timer/counter modes of operation

    Codes :                                           (B) Both (A) and (R) are true but

          (a)   (b)     (c)    (d)   (e)                  (R) is not the correct explanation

    (A) (ii) (iv) (v)          (i)   (iii)                of (A)

    (B) (i)     (v)     (iv) (iii) (ii)
                                                      (C) (A) is true but (R) is false
    (C) (v)     (iii) (ii) (iv) (i)
                                                      (D) (A) is false but (R) is true
    (D) (iii) (ii)      (i)    (v)   (iv)

                                             16
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51. Hierarchy of system design is :                53. Which factor does not affect CMOS
                                                       loading ?
    (A) System level, register transfer
                                                       (A) Charging time associated with
        level, logic gate level, circuit
                                                           output resistance of driving gate
        level, physical level                          (B) Discharging time associated
                                                           with the output resistance of
    (B) Physical level, register transfer
                                                           driving gate
        level, system level, logic gate
                                                       (C) Output capacitance of the load
        level, circuit level                               gate

    (C) System level, circuit level,                   (D) Input capacitance of the load
                                                           gate
        register transfer level, logic gate
                                                   54. Assertion (A) :
        level, physical level
                                                       A stick diagram is an easy method
    (D) Logic gate level, system level,                to create schematic circuit of a logic
        register transfer level, circuit               gate.

        level, physical level                          Reason (R) :
                                                       The stick diagram uses ‘sticks’ or
52. The convolution of
                                                       lines to represent the devices and
        x(m)    h(n)   (1, 2, 1)                       conductors.
                                                       (A) Both (A) and (R) are true and
    will be :                                              (R) is the correct explanation
                                                           of (A)
    (A) {1, 4, 2, –4, 1}
                                                       (B) Both (A) and (R) are true but
    (B) {1, 4, 4, 2, 1}                                    (R) is not the correct explanation
                                                           of (A)
    (C) {1, 4, 6, 4, 1}
                                                       (C) (A) is false but (R) is true
    (D) {1, 4, 1}
                                                       (D) (A) and (R) both are false

                                              17                                     [P.T.O.
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55. Match List I with List II and select        56. Positive photo resists are used more

    the correct answer using the codes              than negative photo resists because :

    given below :                                   (A) Negative photo resists are more

                       List I                            resistive to light, but their
                                                         photolithographic resolution is
    (a) Chemical analysis
                                                         not as high as that of the
    (b) Structural characteristics                       positive photo resists

    (c) Topology                                    (B) Positive photo resists are more
                                                         sensitive to light, but their
    (d) Electrical characteristics
                                                         photolithographic resolution is
                    List II
                                                         not as high as that of negative
    (i)   Probe station                                  photo resists

    (ii) SEM                                        (C) Negative photo resists are less
                                                         sensitive to light
    (iii) XRD
                                                    (D) Positive photo resists are less
    (iv) EDAX
                                                         sensitive to light
    Codes :
                                                57. Which is used for the inter-
          (a)   (b)      (c)    (d)                 connection ?

    (A) (i)     (ii)     (iv) (iii)                 (A) Boron

    (B) (iv) (ii)        (i)    (iii)               (B) Oxygen

    (C) (iv) (iii) (ii) (i)                         (C) Aluminium

    (D) (iii) (i)        (ii) (iv)                  (D) Silicon

                                           18
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58. One can get information on chemical         61. The ratio of electric field intensity
    composition of samples using :                  E and magnetic field intensity H has
                                                    numerical value in free space :
    (A) EDAX
                                                    (A) 35
    (B) TEM
                                                    (B) 377
    (C) SEM only
                                                    (C) 75
    (D) XRD
                                                    (D) 225
59. The device which moves charge
                                                62. Skin depth or depth of penetration
    between capacitive bins for creating
                                                    in a conductor :
    image pixels is popularly known as :
                                                    (1) is inversely proportional to
    (A) Charge Coupled device
                                                         square root of µ and
    (B) Capacitive Cellular Device
                                                    (2) is inversely proportional to
    (C) Charge on Capacitor Device                       square root of f

    (D) Capacitor Charging Device                   (3) is increased as frequency

60. For an NMOS inverter the ratio of                    increases

    Zpu (pull up impedance) and Zpd                 (4) is directly proportional to
    (pull down impendance) has to be at                  square root of µ and
    least :                                         Which statements is/are correct ?
    (A) 1 : 4                                       (A) (1) and (3)

    (B) 4 : 1                                       (B) (1) and (2)

    (C) 1 : 2                                       (C) (2) and (4)

    (D) 2 : 1                                       (D) (4) only

                                           19                                     [P.T.O.
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63. CW RADAR gives :                          66. Which of the following properties of

                                                  electromagnetic waves are correct ?
    (A) Range of target
                                                  (1) The energy of electromagnetic
    (B) Radial velocity of target
                                                       wave is divided between electric
    (C) Size of the target
                                                       and magnetic wave vectors
    (D) Colour of the target                           equally

64. The phase velocity of an electro-             (2) Electric and magnetic field
    magnetic wave depends on frequency                 vectors reach the maxima and
    in aqueous medium, the said                        minima at the same place and
    phenomenon is called :                             same time

    (A) Dispersion                                (3) Both electric and magnetic field

                                                       vectors are perpendicular to
    (B) Polarization
                                                       each other and parallel to the
    (C) Absorption
                                                       direction of propagation of
    (D) Scattering                                     waves

65. A wave guide section in microwave             (4) These waves do require material
    circuits will act as a :                           medium to propagate

    (A) Band stop filter                          (A) (1), (2), (3) and (4)

    (B) Low pass filter                           (B) (1), (2) and (4)

    (C) High pass filter                          (C) (1), (3) and (4)

    (D) Band pass filter                          (D) (1), (2) and (3)

                                         20
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                                               69. Match List I with List II and select
67. We say transmission is matched
                                                   the correct answer using the codes
    when :                                         given below the list :

                                                                      List I
    (A) ZL     z0
                                                   (a) Klystron

    (B) ZL      z0                                 (b) Magnetron

                                                   (c)   Gunn diode
    (C) ZL     z0 / 2
                                                   (d) PIN diode

    (D) ZL     2z0                                                List II

                                                   (i)   Operates on DC power
68. If   a     transmission   line   of
                                                   (ii) RF amplification by kinetic
    characteristic impedance 50      is                  energy

                                                   (iii) High     level injection
    terminated with a load impedance
                                                   (iv) Operation between 10 GHz to
    of 150     , then VSWR is :
                                                         1 THz

                                                   Codes :
    (A) 0.75
                                                         (a)   (b)      (c)    (d)
    (B) 0.5
                                                   (A) (i)     (ii)     (iii) (iv)

                                                   (B) (ii) (i)         (iv) (iii)
    (C) 2
                                                   (C) (iv) (ii)        (iii) (i)
    (D) 1.4                                        (D) (i)     (iii) (ii) (iv)

                                          21                                         [P.T.O.
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70. Assertion (A) :
                                                 71. Suppose the modulating signal is

    Microstrip is very commonly used in
                                                     m(t)     2 cos(2 fmt) and the carrier
    microwave integrated circuits.
                                                     signal      is     yc (t)   A c cos(2 fc t) ,

    Reason (R) :
                                                     which one of the following is a

    Microstrip has an easy access to the
                                                     conventional AM signal without over
    top-surface so that active and

                                                     modulation ?
    passive discrete components can be

    easily mounted.
                                                     (A) x(t)     A cm(t) cos(2 fc t)

    (A) Both (A) and (R) are correct and
                                                                                      Ac
                                                     (B) x(t)     A c cos(2 f c t)       m(t)
                                                                                      4
        (R) is correct explanation of (A)

                                                                                     cos(2 fc t)
    (B) Both (A) and (R) are correct but

        (R) is not correct explanation
                                                     (C) x(t)     A c [1 m(t) cos(2 f c t)

        of (A)

                                                     (D) x(t)     A c cos (2 fm t) cos(2 f c t)
    (C) (A) is correct but (R) is wrong

                                                                + A c sin (2 fm t) cos(2 fc t)
    (D) (A) is wrong but (R) is correct

                                            22
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                                                        74. Which among the following is a false
72. Which of the following communication
                                                            statement ?
    systems is not suitable in IoT                          (A) Channel encoder is to modify
                                                                 the binary stream in such a way
    integration ?
                                                                 that errors in the received
                                                                 signals can be detected and
    (A) Bluetooth
                                                                 possibly corrected

    (B) WiFi                                                (B) If the error can be corrected at
                                                                 a receiver without the need to
    (C) IRDA                                                     request a retransmission of a
                                                                 message is referred as forward
    (D) I 2 C                                                    error correction

                                                            (C) In block encoding the bit stream
73. Delta modulation is a special case                           is partitioned into binary words

    of DPCM in which only the polarity                      (D) Binary words from the source
                                                                 will be referred as codewords
    of the ................... signal is encoded
                                                                 and those from the channel
                                                                 encoder as data words
    as output.
                                                        75. Which of the following can store,
    (A) Summation                                           manipulate and retrieve waveform
                                                            related information ?
    (B) Integration
                                                            (A) CRO

    (C) Difference                                          (B) DMM

                                                            (C) Spectrum analyser
    (D) Differentiation
                                                            (D) DSO

                                                   23                                     [P.T.O.
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76. Which among the following is a false          78. Match List I with List II and select
    statement ?                                       the correct answer using the codes

    (A) FDM is not sensitive to                       given below :
         propagation delay
                                                                        List I
    (B) Channel equalization techniques
                                                      (a) Mixer
         for FDM are complex than those
         for TDM system                               (b) VCO

    (C) TDM uses relatively simple and                (c) Ring modulator
         less costly digital logic circuit
                                                      (d) Codes
         compared to FDM
                                                                      List II
    (D) Code division multiplexing
         allows signals from series of                (i)   Convolution
         independent sources to be
                                                      (ii) Frequency conversion
         transmitted at the same time
         over various frequency band                  (iii) Generation of DSB-SC

77. MEMS stands for :                                 (iv) Generation of FM

    (A) Micro-electro-mechanical systems              Codes :

    (B) Miniature electronic measure-                       (a)   (b)     (c)    (d)
         ment systems
                                                      (A) (iii) (i)       (iv) (ii)
    (C) Motorised electro-mechanical
                                                      (B) (ii) (iii) (iv) (i)
         systems
                                                      (C) (iii) (ii)      (iv) (i)
    (D) Mechanically enhanced micro-
         systems                                      (D) (ii) (iv) (iii) (i)

                                             24
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79. The correct statement for shot noise          80. Electro-encephalogram (EEG) is a

    and Johnson noise is that :                       technique used for checking function
                                                      of :
    (a) Shot noise occurs because the
                                                      (A) Retina
         carriers do not cross the barrier
                                                      (B) Muscular strength
         simultaneously
                                                      (C) Brain
    (b) Shot      noise    is   a   random
                                                      (D) Kidney
         fluctuation that accompanies
                                                  81. At high frequency operation of
         any direct current crossing a
                                                      SCR :
         potential barrier
                                                      (A) di/dt becomes significant
    (c) Johnson noise arises from
                                                      (B) dv/dt becomes significant
         thermal cause wherein electron
                                                      (C) Reverse          blocking   voltage
         in conductor possess kinetic
                                                             becomes significant
         energy
                                                      (D) Switching losses becomes
    (d) Mean noise voltage across the                        significant
         conductor is zero but the root-          82. Square wave inverters provide :
         mean-square value is infinite
                                                      (A) Fixed DC voltage
         and cannot be measured
                                                      (B) Fixed AC with appreciable low
    (A) (a) and (b)                                          frequency harmonics

    (B) (a), (b) and (c)                              (C) Fixed DC with low frequency
                                                             harmonics
    (C) (d) only
                                                      (D) Variable AC voltage with high
    (D) (a) and (c)                                          frequency harmonics

                                             25                                        [P.T.O.
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83. Triac is an integration of :                 85. Match the pair :

    (A) A pair of UJT                                                  SET I

    (B) A pair of converter grade SCR                (a) Chopper
         connected in anti-parallel
                                                     (b) Dimmerstat
    (C) A pair of converter grade SCR
                                                     (c) Inverter
         connected in parallel
                                                     (d) Phase controlled rectifier
    (D) A pair of converter grade SCR

         connected in series                                        SET II

84. In   high      voltage   SCR   based             (i)   Variable speed DC drive

    applications Gate control circuit of
                                                     (ii) Variable speed AC drive
    SCR prefer fibre optical cable for
                                                     (iii) PMDC motor speed control
    triggering purpose, because :

    (A) It provides low impedance for                (iv) Variable AC voltage applications

         power circuit                               Codes :

    (B) It provides high gain for control                  (a)   (b)    (c)    (d)
         circuit
                                                     (A) (i)     (ii)   (iii) (iv)
    (C) It provides very high level of
                                                     (B) (iv) (iii) (ii) (i)
         insulation/isolation
                                                     (C) (iii) (iv) (ii) (i)
    (D) It provides high current for

         power circuit                               (D) (iii) (iv) (i)        (ii)

                                            26
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86. For a typical p-n photodiode the             88. Grating based demultiplexers use

    width of depletion layer (W) is 10               the phenomenon of ............... from an

    µm and drift velocity is 105 m/s,
                                                     optical grating.

    then what is the transit time ?
                                                     (A) Diffraction (Bragg)
    (A) 10 PS

                                                     (B) Scattering
    (B) 10000 PS

                                                     (C) Reflection
    (C) 100 PS


    (D) 1000 PS                                      (D) Transmission


87. The physical mechanism behind the            89. Which of the following would need

    operation of an Acousto-optic filters
                                                     a 4½ digit digital multimeter ?

    in WDM is the :
                                                     (A) 1.999 mA
    (A) Photoelectric effect

                                                     (B) –1.999 µV
    (B) Electro-optical effect

                                                     (C) 1000 V
    (C) Electromagnet effect


    (D) Photoelastic effect                          (D) 1.4856 mV

                                            27                                        [P.T.O.
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90. The following can be used as               92. A basic analog movement with full

    WDM     component      in   optical            scale deflection of 50 µA and


    communication :                                internal resistance of 500   (ohm)

                                                   is used as voltmeter. What is the
    (A) Fibre coupler
                                                   value of multiplier resistor to get
    (B) Optical filters
                                                   voltage range of 0 V to 10 V ?

    (C) Graded index lens
                                                   (A) 200 k

    (D) Epoxy splicer                              (B) 195 k

91. The one of the disadvantages of                (C) 199.5 k

    magnetic flowmeters is :
                                                   (D) 199.9 k

    (A) Handle slurries and greasy
                                               93. The resolution of a 3½ digit DMM

        material only                              on 1 V and 10 V is :

    (B) Handles corrosive fluids                   (A) 0.1 V and 0.01 V


    (C) Very low pressure drop                     (B) 0.01 V and 0.1 V


    (D) Handles fluids having adequate             (C) 0.001 V and 0.1 V

        electrical conductors                      (D) 0.001 V and 0.01 V

                                          28
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94. Match the pair :                             95. For the following the Ra/Rb = 1000,
                                                     R1 = 5      and R1 = 0.5 R2. What
                      SET I
                                                     is the value of RX ?

    (a) Output power measurement

    (b) High resistance measurement

    (c) pH measurement

    (d) Electrical properties of coil and

          capacitors
                                                     (A) 0.001
                   SET II                            (B) 0.01
                                                     (C) 0.1
    (i)   Q meter
                                                     (D) 1.0
    (ii) Calomel electrode
                                                 96. A linear time invariant single input-

    (iii) Megger                                     output system has the state space
                                                     model given by :
    (iv) Wattmeter
                                                             dX/dt = FX + GU

    Codes :                                                       Y = Hz

                                                     (where, X – State space variable,
          (a)   (b)    (c)    (d)
                                                                U – input; Y – output)
    (A) (iv) (i)       (ii) (iii)                    What is the output ?

    (B) (iv) (ii)      (iii) (i)                     (A) 0.25

                                                     (B) 0.5
    (C) (iv) (iii) (ii) (i)
                                                     (C) 1
    (D) (i)     (ii)   (iii) (iv)                    (D) 2

                                            29                                     [P.T.O.
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97. A transfer function of control system          99. In a stable control system backlash
                                                       can cause the following :
    does not have pole-zero cancellation.
                                                       (A) Underdamping
    Which     one   of     the    following
                                                       (B) Overdamping
    statements is correct ?                            (C) Poor stability at reduced values
                                                             of open loop gains
    (A) System is neither controllable
                                                       (D) Low level oscillations
         nor observable
                                                   100. Match the pair :

    (B) System        is         completely                              SET I

                                                       (a) Bode plot
         controllable and observable
                                                       (b) Nyquist criterion
    (C) System is observable but
                                                       (c) Z-transform
         uncontrollable                                (d) Inverse-Laplace transform

                                                                      List II
    (D) System is controllable but
                                                       (i)   Time response solution
         unobservable
                                                       (ii) Sampled data system
98. Loop which do not possess any                      (iii) Frequency response method

    common node are said to be :                       (iv) Stability of control system

                                                       Codes :
    (A) Forward gain loops
                                                             (a)   (b)    (c)    (d)
    (B) Touching loops                                 (A) (iii) (iv) (ii) (i)

                                                       (B) (i)     (ii)   (iii) (iv)
    (C) Non-touching loops
                                                       (C) (iv) (iii) (ii) (i)
    (D) Feedback gain loops                            (D) (iv) (i)       (iii) (ii)

                                              30
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ROUGH WORK




    31                 [P.T.O.
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ROUGH WORK




    32
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Source: Savitribai Phule Pune University. Question paper published by Savitribai Phule Pune University.