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MH SET 2019: 23 June, Paper II, Electronic Science

  • Date: 23 June 2019
  • Paper code: JUN-38219
  • Series: A
  • Language: Bilingual
  • 32 pages
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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.
JUN - 38219                                                                                          (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)
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                                                                                           (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
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           allotted for the relevant entries, which may disclose your
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           end of the examination compulsorily and must not carry it with          9.
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           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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JUN - 38219/II—A




2
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JUN - 38219/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.   Which of the following compounds          3.   Ebers-Moll model of BJT has two
     is not suitable for Light Emitting             coupled back to back diodes in
     Diodes (LEDs) ?                                parallel with controlled current
                                                    sources.
     (A) GaN
                                                    Which of the following is/are correct
     (B) GaP
                                                    for switching applications ?
     (C) SiCa
                                                    (1) If two diodes are both in
     (D) GaAs
                                                        forward bias, then the BJT is
2.   The distribution coefficient Kd is                 in a low impedance state.
     given by
                                                    (2) If two diodes are both in reverse
                     CS
                Kd                                      bias, then BJT is in a high
                     CL
                                                        impedance state.
     where C S = Concentration of
                                                    (3) If two diodes are both in
     impurity in the solid
                                                        forward bias, then the BJT is
     CL = Concentration in the liquid                   in high impedance state.
     Which of the following is not a                (4) If two diodes are both in reverse
     function of Kd ?                                   bias, then BJT is in low
     (A) Growth rate                                    impedance state.

     (B) The impurity concentration                 (A) 1 and 2

     (C) The temperature of the solid-              (B) 2 and 4

         liquid interface                           (C) 1, 2 and 3

     (D) The orientation of the material            (D) 2, 3 and 4

                                           3                                       [P.T.O.
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4.   The technique of growing an                6.   When the applied voltage across the

     oriented single crystal layer on a              PN junction is less than zero,


     substrate wafer is called :                     then :


                                                     (A) Energy barrier between P and
     (A) Oxidation

                                                            N junction becomes small
     (B) Ion-implantation
                                                     (B) Drift current flow is favourable
     (C) Epitaxy
                                                     (C) Diffusion current       flow is
     (D) Diffusion
                                                            favourable

5.   Determine the values of current
                                                     (D) Drift current flow is not

     amplification factor ( ) of two
                                                            favourable

     different     transistors     having
                                                7.   Band gap of SiO2 in electron volt

      1 = 0.99 and     2 = 0.98 :
                                                     is :

     (A) 99 and 98 respectively
                                                     (A) 1.12 eV

     (B) 49 and 99 respectively                      (B) 1.42 eV

     (C) 99 and 49 respectively                      (C) 5 eV


     (D) 98 and 99 respectively                      (D) 8 eV

                                            4
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8.   The tunnel diode is useful in               10. Match List-I with List-II :

     microwave oscillators and amplifiers                               List I

     because of the following reasons :              (a) Drift current

                                                     (b) Diffusion current
     (A) Because it is lightly doped as

         compared to PN junction diode.                                   qVD
                                                     (c)   ID      IS e
                                                                           kT
     (B) Because it absorbs power.
                                                     (d) ID        – IS
     (C) Because it exhibits a negative
                                                                    List II
         resistance characteristic in the
                                                     (1) Ideal current when V D is
         region between peak current IP                  negative
         and valley current IV.                      (2) A current when there is an
                                                           electric field
     (D) Because it exhibits a positive
                                                     (3) A current when there is
         resistance characteristic in the
                                                           concentration difference for
         region between peak current IP
                                                           either the electrons or holes or
         and valley current IV.                            both

9.   Identify which one of the following             (4) Ideal current when V D is

     materials cannot be used for the gate               positive

     electrode in a MOSFET ?                         Codes :

                                                           (a)    (b)     (c)    (d)
     (A) Aluminium
                                                     (A) (1)      (2)     (3)    (4)
     (B) Tungsten
                                                     (B) (2)      (3)     (4)    (1)
     (C) Gold
                                                     (C) (3)      (4)     (1)    (2)

     (D) Hafnium dioxide                             (D) (2)      (3)     (1)    (4)
                                             5                                         [P.T.O.
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11. Find the short circuit current (IS.C.)       13. An ideal filter is the one which

     of the following circuit using                  has :
     Norton’s theorem :
                                                     (A) Zero attenuation in the pass

                                                         band


                                                     (B) Zero attenuation in the reject

                                                         band


                                                     (C) Infinite attenuation in the pass
     (A) 4 A
                                                         band
     (B) 2.5 A
                                                     (D) Finite attenuation in the reject
     (C) 8 A
                                                         band
     (D) 6 A
                                                 14. If a network contains B branches
12. A two port network is a rectangular
                                                     and N nodes, then the number of
     box that represents a network
                                                     mesh current equations would be :
     consisting of :
                                                     (A) B – (N – 1)
     (A) Two pairs of ports

                                                     (B) N – (B – 1)
     (B) Two pairs of terminals

                                                     (C) B – N – 1
     (C) n-pairs of ports

     (D) Two terminals                               (D) (B + N) – 1

                                             6
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15. A power factor of 1 indicates a :           18. What is the phase angle of a series

    (A) Purely resistive element                    RLC circuit at resonance ?

    (B) Purely resistive circuit                    (A) Zero

    (C) Purely reactive element
                                                    (B) 90°
    (D) Purely reactive circuit
                                                    (C) 45°
16. The Laplace transform of first
                                                    (D) 30°
    derivative of function f(t) is :

    (A) F(s)/s                                  19. A function is said to be even if :

    (B) sF(s) – f(0)                                (A) f(t) = – f(– t)

    (C) F(s) – f(0)
                                                    (B) f(t) = f(– t)
    (D) f(0)
                                                                      T
                                                    (C) f(t) = – f t – 0
17. State variable analysis is not                                     2

    applicable to which of the following            (D) f(t) = – f(t)
    circuits ?
                                                20. A superposition theorem is valid for
    (A) A circuit consisting of resistors
                                                    which of the following ?
        only

    (B) A circuit with resistors and                (A) Resistors with voltage sources

        capacitors                                  (B) Resistors with diodes
    (C) A circuit with capacitors and
                                                    (C) Resistors with transistors
        inductors
                                                    (D) Resistors with zener diodes
    (D) A RLC circuit

                                            7                                     [P.T.O.
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21. Peak inverse voltage of diodes in
                                                     24. An amplifier having open loop gain
    bridge rectifier is normally .............
    times that of diodes in full wave                    of 100 is provided with a negative

    rectifier with centre tap transformer.               feedback having feedback factor of
    (A) 3
                                                         0.02. The gain of the amplifier after
    (B) 2
                                                         feedback will be :
    (C) 0.5

    (D) 1                                                (A) 50.00

22. Load regulation of a regulated power                 (B) 33.33
    supply must be :
                                                         (C) 60.72
    (A) As high as possible

    (B) Varying with load impedance                      (D) 21.89

    (C) As low as possible
                                                     25. The number of harmonics in addition
    (D) Fixed to some intermediate
         value                                           to base frequency present in the

23. For a 3-stage amplifier having gains                 output of a tuned oscillator are :
    of 5 dB, 10 dB and 15 dB respectively,
                                                         (A) 5
    the overall gain would be :

    (A) 750 dB                                           (B) 2

    (B) 15 dB
                                                         (C) 0
    (C) 25 dB

    (D) 30 dB                                            (D) 1

                                                 8
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                                              28. Arrange the following semicon-
26. The output of the following circuit
                                                  ductor devices in increasing order of
    will be :                                     number of p-n junctions :
                                                  (i)   diode
                                                  (ii) mosfet
                                                  (iii) bjt
                                                  (iv) scr
                                                  Codes :
                                                  (A) (ii), (i), (iii), (iv)
                                                  (B) (i), (ii), (iii), (iv)
    (A) 2 V                                       (C) (iii), (ii), (i), (iv)
                                                  (D) (iii), (ii), (iv), (i)
    (B) 0 V
                                              29. Match List-I with List-II :
    (C) – 1 V                                                        List-I
                                                  (a) Active filters
    (D) 1 V
                                                  (b) Multivibrators
27. Which of the following is not true            (c)   Schmitt trigger
    in case of phase locked loop ?                (d) Voltage regulator
                                                                    List-II
    (A) The phases of input and VCO
                                                  (i)   Hysteris
        are matched                               (ii) dc output

    (B) The frequency of input and                (iii) Pulse/Pulse train
                                                  (iv) R-C network with OP-Amp.
        VCO are same
                                                  Codes :
    (C) The VCO frequency tracks the                    (a)   (b)      (c)     (d)
        input                                     (A) (i)     (ii)     (iii) (iv)
                                                  (B) (iv) (iii) (i)           (ii)
    (D) The VCO input is always zero
                                                  (C) (iv) (iii) (ii) (i)
        when locked                               (D) (iii) (ii)       (i)     (iv)

                                          9                                            [P.T.O.
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                                                  31. The correct circuit of a Half Adder
30. Assertion (A) :

                                                      is :

    An     oscillator      is   basically
                                                      (A)
    multivibrator with feedback.



    Reason (R) :



    R-C combination is used for low or                (B)


    high pass filtering.



    (A) Both (A) and (R) are true and

                                                      (C)
         (R) is correct explanation of (A)



    (B) Both (A) and (R) are true and (R)


         is not correct explanation of (A)
                                                      (D)

    (C) (A) is true and (R) is false



    (D) (A) is false and (R) is true

                                             10
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                                                                      1
32. A 16-bit presetable counter with 1         34. An ADC used in 3     (Three and half)
                                                                      2

    MHz clock input can be used to                 digital multimeter is generally :

    generate delay in the range of :
                                                   (A) 12 bit dual slope

    (A) 0 to 64 mS with 1 S resolution
                                                   (B) 8-bit successive approximation

    (B) 16      S with 1   S resolution
                                                   (C) 8-bit flash

    (C) 6400     S with 1 mS resolution
                                                   (D) 8-bit dual slope
    (D) 16 mS with 1 mS resolution
                                               35. A state equation specifies :
33. Address and Data lines required to

                                                   (A) Next state as a function of
    access 32 kB, byte organised memory

                                                        present state and inputs
    will be :


    (A) 12 and 8                                   (B) Clock applied



    (B) 13 and 8                                   (C) Behaviour of a combinational


    (C) 32 and 1                                        circuit



    (D) 15 and 8                                   (D) Number of arithmetic operations

                                          11                                      [P.T.O.
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36. An 8-bit DAC is used to control a
                                                   38. What does the following HDL
    linear valve with a 0 to 5 volt signal.

    The valve is fully open if the signal             statement mean ?

    is 5 volts and closed if signal is 0

    volt. An approximate resolution of                     wire [7 : 0] data-a;

    the DAC in terms of volts and
                                                      (A) data-a is an 8-bit wire and the
    percentage of valve opening will be :


    (A) 0.02 V and 0.4%                                   msb is bit 7

    (B) 0.01 V and 10%
                                                      (B) data-a is a 4-bit wire and the
    (C) 0.1 V and 10%


    (D) 0.02 V and 4%                                     msb is bit 7


37. Decimal to BCD priority encoder,
                                                      (C) data-a is a 4-bit wire and the
    74147 will have :


    (A) 8 inputs and 4 outputs                            lsb is bit 7


    (B) 10 inputs and 8 outputs
                                                      (D) data-a is a 8-bit wire and the
    (C) 10 inputs and 4 outputs

                                                          lsb is bit 7
    (D) 8 inputs and 8 outputs

                                              12
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39. Match the List-I with List-II and          40. Assertion (A) :

    select the correct answer using the
                                                   Universal shift register can be used
    codes given below the lists :

                      List-I                       to implement accumulator.

    (a) ALU
                                                   Reason (R) :
    (b) Parity checker

    (c) Shift register                             Addition and subtraction can be

    (d) DRAM                                       realised using shift registers.

                      List-II
                                                   (A) Both (A) and (R) are true and
    (i)   EXOR-Gate
                                                       (R) is the correct explanation
    (ii) Full adder

    (iii) MOS Transistor                               of (A).

    (iv) DFF
                                                   (B) Both (A) and (R) are true but
    Codes :
                                                       (R)   is   not    the   correct
          (a)   (b)     (c)     (d)

    (A) (iii) (iv)      (i)     (ii)                   explanation of (A).

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

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

                                          13                                    [P.T.O.
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41. Microcontroller 8051 operates with         43. Which of the following special

                                                   function registers of 8051 is not bit
    12 MHz oscillator and one machine
                                                   addressible ?
    cycle is defined as 12 oscillator
                                                   (A) Accumulator (ACC)
    periods. The execution time for a 4
                                                   (B) Program Status Word (PSW)
    machine cycle instruction would
                                                   (C) Port O (PO)
    therefore be :
                                                   (D) Serial Data Buffer (SBUF)
    (A) 4   s
                                               44. The fastest I/O data transfer uses :
    (B) 8   s
                                                   (A) Polled I/O

    (C) 1   s
                                                   (B) Interrupt driven I/O

    (D) 2   s                                      (C) Memory mapped I/O


42. 8086 works in multiprocessing mode             (D) DMA


    with the help of :                         45. MUL A, B instruction of micro-

                                                   controller 8051 needs :
    (A) Virtual memory
                                                   (A) 4 machine cycles
    (B) DMA mode
                                                   (B) 2 machine cycles

    (C) Max mode
                                                   (C) 1 machine cycle

    (D) Minimum mode                               (D) 3 machine cycles

                                          14
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46. If the contents of code segment            48. The correct sequence of execution of

    register of 8086 is 1000H and the              Read/Write instruction in 8086 Min

    instruction pointer is loaded with
                                                   mode of operation is :

    0134H, then the instruction will be
                                                   (A) Set MN/MX high, Output high
    fetched from :
                                                        on M/IO, Set ALE, Transfer

    (A) 10000H
                                                        data

    (B) 0134H
                                                   (B) Set MN/MX low, Output high

    (C) 10134H
                                                        on M/IO, Transfer data, Set

    (D) 1134H
                                                        ALE

47. Vector addresses of 8051 interrupts
                                                   (C) Output high on M/IO, Transfer

    are located in :
                                                        data, Set ALE, Set MN/MX

    (A) On-chip RAM                                     high

    (B) 0000-0023H                                 (D) Transfer data, Set ALE, Set

    (C) 0001-1000H                                      MN/MX high, Output high


    (D) External memory                                 on M/IO

                                          15                                    [P.T.O.
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49. Match List-I with List-II :            50. ASSERTION (A) :

           List I : Register
                                              LCALL adder16 calls a subroutine
    (a) IP
                                              located at the indicated address.
    (b) CX
                                              REASON (R) :
    (c) SI

                                              The execution of LCALL results in
    (d) SP

                                              putting the 16-bit address on the
                List II : Use

    (i)   Loop operations                     stack.


    (ii) String manipulation                  (A) Both (A) and (R) are true and

    (iii) Modular programming                     (R) is the correct explanation

    (iv) Code access                              of (A)

    Codes :
                                              (B) Both (A) and (R) are true but
          (a)    (b)   (c)    (d)
                                                  (R)      is   not   the   correct
    (A) (iv) (ii)      (iii) (i)
                                                  explanation of (A)
    (B) (ii) (i)       (iii) (iv)
                                              (C) (A) is true but (R) is false
    (C) (iv) (i)       (ii)   (iii)

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

                                      16
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51. Identify the ordered processing            53. Which of the following cannot be
    steps in fabrication of integrated
                                                   obtained from an X-ray crystallography
    circuits :
                                                   study ?
    (A) Diffusion, Oxidation, Chemical

           vapour deposition, Photo-               (A) Packing arrangements
           lithography, Metallization
                                                   (B) Spacing between two parallel
    (B) Oxidation, Diffusion, Chemical

           vapour deposition, Photo-                   atomic rings

           lithography, Metallization
                                                   (C) Vibration frequency of a
    (C) Chemical vapour deposition,
                                                       carbonyl group
           Oxidation, Diffusion, Photo-

           lithography, Metallization              (D) Geometry of hydrogen bonding

    (D) Diffusion, Oxidation, Photo-
                                               54. Most of the VLSI foundries specify
           lithography, Chemical vapour
                                                   Design Rule files. These design rules
           deposition, Metallization
                                                   however do not specify :
52. In nMOS device, gate material could

    be :                                           (A) Line widths

    (A) Silicon
                                                   (B) Interpattern separations
    (B) Polysilicon
                                                   (C) Layer colours
    (C) Boron

    (D) Phosphorus                                 (D) Pattern extensions

                                          17                                     [P.T.O.
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55. In CMOS logic circuits the p-MOS           57. The Fast Fourier Transform

    transistor acts as :                           algorithm exploits properties of the

                                                   twiddle factor :
    (A) Pull-down network
                                                   (A) Symmetry and periodicity
    (B) Pull-up network
                                                   (B) Convolution and correlation
    (C) Short to ground
                                                   (C) Linearity and causality
    (D) Load
                                                   (D) Asymmetry and linearity
56. The circuit diagram shown in figure
                                               58. ASSERTION (A) : Epitaxy refers
    represents :
                                                   to the deposition of a crystalline

                                                   overlayer on a crystalline substrate.

                                                   REASON (R) : An epitaxial layer

                                                   cannot be doped during growth

                                                   phase.

                                                   (A) Both (A) and (R) are true and

                                                       (R) is correct explanation of (A)

                                                   (B) Both (A) and (R) are true but
    (A) Two input CMOS AND gate
                                                       (R) is not correct explanation

    (B) Two input CMOS NAND gate                       of (A)

    (C) Two input CMOS NOR gate                    (C) (A) is true but (R) is false

    (D) Two input CMOS OR gate                     (D) (A) and (R) both are false

                                          18
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59. Match List-I with List-II :
                                               61. On which of the following principles
                      List-I
    (a) Gate conductor                             does Klystron operate ?

    (b) Masking impurity diffusion
                                                   (A) Amplitude modulation
    (c) Isolation method
    (d) Layout planning                            (B) Frequency modulation
                      List-II
    (i)   SiO2 layer                               (C) Pulse modulation

    (ii) Polysilicon
                                                   (D) Velocity modulation
    (iii) Stick diagram
    (iv) Trench oxidation (LOCOS)              62. DSO cannot be used for :
    Codes :
          (a)   (b)     (c)     (d)                (A) Signal analysis

    (A) (ii) (iii) (iv) (i)
                                                   (B) Signal monitoring
    (B) (iii) (i)       (ii)    (iv)
    (C) (iv) (i)        (ii)    (iii)              (C) Signal digitisation
    (D) (ii) (i)        (iv) (iii)
60. Identify the correct sequence for              (D) Signal generation
    implementing sensors in IOT :
                                               63. Duplexer in RADAR system is :
    (A) Data acquisition, conversion,
          sensing and communication
                                                   (A) An oscillator
    (B) Sensing, data acquisition,
          conversion and communication             (B) Microwave switch
    (C) Sensing, conversion, data
          acquisition and communication            (C) An amplifier
    (D) Sensing, conversion, communi-
          cation and data acquisition              (D) Active filter

                                          19                                     [P.T.O.
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64. Which of the following is the
                                              67. The dominant mode of a rectangular
    Poisson’s equation ?
    (A)    2V = –         /                       wave guide is :
    (B)    2V = – 4

    (C)    2V = – 4                               (A) TE 11
    (D)    2V = 0
                                                  (B) TE 12
65. The Health status of functioning
    heart is recorded as ECG, which is
    represented as :                              (C) TE 10

    (A) Current in              A
                                                  (D) TE21
    (B) DC voltage in mV
    (C) Pulsed waveform of micro volt
                                              68. Arrange the following microwave
    (D) High frequency signal
66. Match List-I with List-II :                   frequency bands on increasing order
      List-I : Number on Display
                                                  of frequency :
    (a) 1072
    (b) 893                                       (i)   L Band
    (c) 132
    (d) 59705                                     (ii) S Band
                List-II : ADC
    (i)   8-bit                                   (iii) C Band

    (ii) 10-bit
                                                  (iv) X Band
    (iii) 12-bit
    (iv) 16-bit
                                                  (A) (iii), (i), (iv), (ii)
    Codes :
          (a)     (b)    (c)    (d)               (B) (iv), (iii), (ii), (i)
    (A) (iii) (i)        (ii)   (iv)
    (B) (iii) (ii)       (i)    (iv)              (C) (ii), (iii), (iv), (i)
    (C) (iv) (i)         (ii)   (iii)
    (D) (i)       (ii)   (iii) (iv)               (D) (i), (ii), (iii), (iv)

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69. Match the following lists :              70. Assertion-Reason type questions :

                       List I
                                                 Assertion (A) :

    (a) Tunnel diode
                                                 Electromagnetic waves are trans-
    (b) Gunn diode
                                                 verse in nature.
    (c) Reflex klystron
                                                 Reason (R) :
    (d) TRAPATT
                                                 The electric and magnetic fields are
                   List II
                                                 perpendicular to the direction of
    (i)   Negative Resistance
                                                 wave propagation.
    (ii) Two cavity
                                                 (A) Both (A) and (R) are true and
    (iii) Oscillator
                                                     (R) is the correct explanation
    (iv) Low noise oscillator
                                                     of (A)
    Codes :

                                                 (B) Both (A) and (R) are true but
          (a)   (b)      (c)    (d)
                                                     (R) is not correct explanation
    (A) (i)     (iii) (iv) (ii)
                                                     of (A)
    (B) (i)     (iii) (ii)      (iv)

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

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

                                        21                                    [P.T.O.
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71. An AM signal is detected using an            73. A frame in video transmission

    envelope detector. The carrier                   system has 800 × 400 pixel grid with

    frequency and modulating signal                  64 intensity levels per pixel. The

                                                     transmission system transmit 360
    frequency are 2 MHz and 1 kHz
                                                     picture frames per second. The data
    respectively. An appropriate value
                                                     rate of the system is :
    for the time constant of the envelope

    detector is :                                    (A) 1382.4 Mb/s

                                                     (B) 3686 Mb/s
    (A) 2000        s

                                                     (C) 691.2 Mb/s
    (B) 0.050       s

                                                     (D) 7372 Mb/s
    (C) 100     s
                                                 74. Receiver without automatic gain
    (D) 200     s
                                                     control is tuned to a strong station,
72. Which of the following is not the
                                                     the signal may ................ the later IF
    MEMS application ?
                                                     and AF stage.

    (A) Impact sensor in air bags                    (A) Cut-off

    (B) Face detection                               (B) Overload

    (C) Hall effect proximity sensor                 (C) Underload

    (D) Accelerometer                                (D) Cut-in

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75. An eye diagram is an oscillocope                      77. In frequency shift keying :

                                                              (a) The combined signal in FSK
    display in which the ...................... is
                                                                    modulator generated from two
    synchronized to the ..................... .
                                                                    separate oscillators cannot have

    (A) Bit rate, intensity base                                    discontinuities in amplitude.

                                                              (b) The combined signal in FSK
    (B) Intensity base, time base
                                                                    modulator generated from two

    (C) Time base, bit rate                                         separate oscillators cannot have
                                                                    discontinuities in phase.
    (D) Bit rate, time base
                                                              (c)   The combined signal in FSK
76. Three sinusoidal signals 2400 Hz,                               modulator generated from
                                                                    single oscillator method can
    1200 Hz and 800 Hz are sampled
                                                                    have     discontinuities     in
    at their respective Nyquist rates,
                                                                    amplitude.
    these are encoded with 8 bit words                        (d) The combined signal in FSK
    and time division multiplexed. The                              modulator generated from
                                                                    single oscillator method cannot
    bit rate for the multiplexed signal
                                                                    have     discontinuities     in
    is :                                                            amplitude.

    (A) 35.2 kb/s                                             Options :

                                                              (A) (b) and (d)
    (B) 105.6 kb/s
                                                              (B) (a) and (d)
    (C) 352 kb/s
                                                              (C) (d) only
    (D) 10.56 kb/s                                            (D) (a) and (c)

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78. Match List I with List II and select
                                                       79. The main difference between the
    the correct answer using codes given

    below :                                                thermal noise and shot noise is


                      List I                               that :

    (a) DSB-SC modulation
                                                           (A) Mean square noise component
    (b) Amplitude modulation

    (c) Frequency modulation                                   is dependent noise bandwidth in

    (d) Phase modulation
                                                               shot and thermal noise
                    List II

                                  t                        (B) Mean noise component is zero
    (i)   A sin (wct + k              m( z) dz)
                                 –

    (ii) A sin (wct + km(t))                                   in both

    (iii) k.m(t) A sin (wct)
                                                           (C) Shot      noise   non-uniform
    (iv) {1 + km(t)} A sin (wct)

    Codes :                                                    spectrum in high microwave

          (a)   (b)     (c)    (d)
                                                               frequency range
    (A) (iv) (i)        (iii) (ii)

    (B) (iii) (iv)      (i)    (ii)
                                                           (D) Shot noise and thermal noise is
    (C) (iii) (i)       (ii)   (iv)
                                                               temperature dependent
    (D) (iv) (iii) (i)         (ii)

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                                                  82. For the following DIAC triggered
80. Which of the following technologies is
                                                      circuit the pattern of the current
                                                      trigger pulses at gate (IG) will be :
     associated with IOT implementation ?


     (A) High power drivers


     (B) Big data analytics


     (C) LTCC


     (D) Cryogenics                                   (A)


81. Find maximum operating/switching


     frequency of a converter grade SCR
                                                      (B)
     whose turn on time and turn off time


     are 50   s and 150    s respectively.


     (A) 20 kHz
                                                      (C)

     (B) 10 kHz


     (C) 5 kHz

                                                      (D)
     (D) 2 kHz

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                                                    85. In two transistor analogy of a
83. In thyristor circuits to isolate control
                                                        thyristor, if ‘ ’ is current gain and
     part from power section the following
                                                        ICBO is the collector leakage current,

     method of coupling is used :                       the expression for anode current ‘IA’

                                                        is given by :
     (A) Pulse transformer
                                                        (A) I A    1IG    ICBO1 – ICBO2
                                                                         1–( 1   2)
     (B) High voltage capacitor
                                                        (B) I A    1IG    ICBO1 ICBO2
                                                                         1 ( 1   2)
     (C) Specialized RC section
                                                                   2 IG     ICBO2 ICBO1
                                                        (C) I A
                                                                         1 – ( 1 – 2)
     (D) High speed relay

                                                        (D) I A    2 IG   ICBO1 ICBO2
                                                                         1–( 1  2)
84. Field breakdown voltage for silicon

                                                    86. The following light source has the
     used in power devices is :

                                                        best directivity :
     (A) 100 kV/cm
                                                        (A) Burrus LED

     (B) 300 kV/cm
                                                        (B) Edge emitting LED

     (C) 1 MV/cm
                                                        (C) Surface emitting LED


     (D) 10 MV/cm                                       (D) Double Heterojunction LED

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87. The following technique is best              90. Match the following :
    suited for low cost optical fibers :
                                                                       Set I
    (A) VAD
                                                     (a) Line width
    (B) OVD
                                                     (b) Directionality
    (C) MCVD
                                                     (c)   Energy
    (D) Double crucible

88. The following optical fiber has no               (d) Quality factor

    effect of impurity in the axis region                              Set II
    in its transmission properties :
                                                     (i)   Wavelength
    (A) Graded index fiber
                                                     (ii) Coherence
    (B) Single mode fiber
                                                     (iii) Energy stored
    (C) Step index multimode fiber
                                                     (iv) Scattering
    (D) Plastic cladded silica fiber

89. In a four level laser system :                   Codes :

    (A) There are four blocks in the                       (a)   (b)     (c)    (d)

        laser system
                                                     (A) (i)     (iii) (ii) (iv)
    (B) Power levels are very high
                                                     (B) (iv) (iii) (i)         (ii)
    (C) Lower lasing level empty
                                                     (C) (i)     (iv) (ii) (iii)
    (D) Pumping power is designed

        with four stages                             (D) (ii) (iv) (i)          (iii)

                                            27                                          [P.T.O.
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Q. No. 91 – 95 :
                                                 (4) Resolution : The smallest
    The static characteristics of an
                                                     change in a measured variable
    instrument      are,    in   general,
                                                     to which an instrument will
    considered for instruments which
    are used to measure an unvarying                 respond.
    process condition. All the static
                                                 (5) Precision : A measure of the
    performance characteristics are
    obtained by one form or another of               consistency or repeatability of

    a process called calibration. There              measurements i.e., successive
    are a number of related definitions              reading do not differ. (Precision
    (or characteristics), which are
                                                     is the consistency of the
    described below, such as accuracy,
    precision, repeatability, resolution             instrument output for a given
    errors, sensitivity, etc.                        value of input).
    (1) Instrument : A device or
                                                 (6) Expected value : The design
        mechanism used to determine
                                                     value i.e., the most probable
        the present value of the
        quantity under measurement.                  value that calculations indicate

    (2) Measurement : The process of                 one should expect to measure.
        determining        the   amount,
                                                 (7) Error : The deviation of the
        degree,      or    capacity   by
        comparison (direct or indirect)              true value from the desired

        with the accepted standards of               value.
        the system units being used.
                                                 (8) Sensitivity : The ratio of the
    (3) Accuracy : The degree of
                                                     change in output (response) of
        exactness (closeness) of a
        measurement compared to the                  the instrument to a change of

        expected (desired) value.                    input or measured variable.

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91. W h i ch of t h e fol l ow i n g i s not an        94. Which of the following has very low

     instrument ?                                          precession ?

                                                           (A) Mercury thermometer
     (A) Fuel gauge in motorbike
                                                           (B) PTC thermometer
     (B) Meter scale
                                                           (C) Thermistor gauge
     (C) PID controller
                                                           (D) Pyroelectric gauge
     (D) Wrist watch
                                                       95. Which of the following is highly
92. Which of the following is most
                                                           sensitive transducer ?
     accurate       device     for    length
                                                           (A) Photodiode
     measurement ?
                                                           (B) Potentiometer
     (A) Odometer
                                                           (C) Thermocouple
     (B) Calorimeter
                                                           (D) Thermistor
     (C) Micrometer
                                                       96. Transient analysis in a control

     (D) Vernier calipers                                  system means :

93. Which of the following instruments                     (A) Subjecting a system for short

     has highest resolution ?                                  duration of period

                                                           (B) Applying      high     voltage
     (A) Electrometer
                                                               momentarily
     (B) Micro-ammeter
                                                           (C) Analysing system with infinite
     (C) 6½ digit multimeter                                   frequency spectrum

     (D) Galvanometer                                      (D) A mathematical tool

                                                  29                                   [P.T.O.
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97. Derivative control is desirable in a        99. In a control system, what is the

    system in which :                               percentage error in measurement if

    (A) Output goes to steady state                 the variable range is 4.20 mA and

         below the set level                        the measured value is 13 mA with

    (B) Value of the controlled variable            set point of 10 mA :

         changes rapidly
                                                    (A) 18.75

    (C) Environmental variables play
                                                    (B) 20.50
         higher role
                                                    (C) 24.00
    (D) Cost    effective   design    is
                                                    (D) 28.75
         necessary

                                                100. Disadvantage of an electronic
98. The following is an example for
                                                    control system is :
    closed loop system :

                                                    (A) Large current requirement
    (A) Room fan


    (B) Air cooler                                  (B) Expensive


    (C) Laboratory soldering iron                   (C) Susceptible to fire risk


    (D) Refrigerator                                (D) Varies with seasonal changes

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ROUGH WORK




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ROUGH WORK




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