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MH SET 2018: 28 January, Paper III, Electronic Science

  • Date: 28 January 2018
  • Paper code: JAN38318
  • Series: A
  • Language: Bilingual
  • 24 pages
MH SET 2018 question paper, 28 January 2018, Paper III, Electronic Science, page 1 of 24
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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.

JAN - 38318                                                                                         (To be filled by the Candidate)
Time Allowed : 2½ Hours]                                                                            [Maximum Marks : 150
Number of Pages in this Booklet : 24                                                   Number of Questions in this Booklet : 75
                     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 75 objective type questions. Each question
          will carry two marks. All questions of Paper-III will be compulsory,   2.
          covering entire syllabus (including all electives, without options).
3.        At the commencement of examination, the question booklet
          will be given to the student. In the first 5 minutes, you are
          requested to open the booklet and compulsorily examine it as           3.
          follows :
          (i)      To have access to the Question Booklet, tear off the
                   paper seal on the edge of this cover page. Do not accept
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                   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                    (ii)
                   cover page. Faulty booklets due to missing pages/
                   questions or questions repeated or not in serial
                   o rder or any other discre pancy should not be
                   accepted and correct booklet should be obtained
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                   Afterwards, neither the Question Booklet will be
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          (iii)    After this verification is over, the OMR Sheet Number
                   should be entered on this Test Booklet.                               (iii)
4.        Each question has four alternative responses marked (A), (B),
          (C) and (D). You have to darken the circle as indicated below on
          the correct response against each item.                                4.                       (A), (B), (C)   (D)
          Example : where (C) is the correct response.

                             A        B                 D
                                                                                                    (C)
5.        Your responses to the items are to be indicated in the OMR
          Sheet given inside the Booklet only. If you mark at any place                                   A        B              D
          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.
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          any mark on any part of the OMR Sheet, except for the space            7.
          allotted for the relevant entries, which may disclose your             8.
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          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.       Use only Blue/Black Ball point pen.                                    10.
11.       Use of any calculator or log table, etc., is prohibited.               11.
12.       There is no negative marking for incorrect answers.                    12.
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JAN - 38318/III—A




2
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JAN - 38318/III—A
                                   Electronic Science
                                                 Paper III
Time Allowed : 2½ Hours]                           [Maximum Marks : 150
Note : This paper contains Seventy Five (75) multiple choice questions, each
       question carrying Two (2) marks. Attempt All questions.

1.   If the temperature of a semi-                       3.   If a full wave rectifier circuit is

     conductor diode increases, then                          operating from 50 Hz mains, then

     leakage current .........................                the fundamental frequency in the

     (A) remains the same                                     ripple will be :


     (B) decreases                                            (A) 25 Hz


     (C) increases                                            (B) 50 Hz


     (D) becomes zero                                         (C) 70.7 Hz


2.   If the base current is 30             A and              (D) 100 Hz

     current gain is 50, then the collector              4.   Thermal oxidation in IC fabrication

     current will be :                                        is a process carried out at :

     (A) 15 mA                                                (A) High temperature

     (B) 1.5 mA                                               (B) Low pressure

     (C) 150 mA                                               (C) Sub zero temperature

     (D) 1.5 A                                                (D) Room temperature


                                                     3                                      [P.T.O.
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5.   Match List I with List II and select                6.   Match List I with List II and select
     the correct answer using codes given                     the correct answer using codes given
     below :                                                  below.
                    List I                                                   List I
     (a) BJT                                                  (a) Ion Implantor
     (b) JFET                                                 (b) CVD Reactor
     (c) ZENER diode                                          (c) UV Exposure
     (d) MOSFET                                               (d) Pad to pin connection

                   List II                                                   List II
     (i)   High                                               (i)   Photolithography
     (ii) Voltage regulator                                   (ii) Conductor and directric film
     (iii) Insulated          gate         voltage                  deposition
           controlled current                                 (iii) Bonding
     (iv) Reverse biased gate                                 (iv) Doping
     Codes :                                                  Codes :
            (a)    (b)     (c)     (d)                               (a)     (b)       (c)    (d)
     (A)    (iv) (ii)      (iii)   (i)                        (A)    (i)     (iii)     (ii)   (iv)
     (B)    (i)    (iii)   (ii)    (iv)                       (B)    (ii)    (iv)      (i)    (iii)
     (C)    (ii)   (iv)    (iii)   (i)                        (C)    (iv)    (ii)      (i)    (iii)

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


                                                     4
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7.   The driving point impedance Z(s) of         9.   The Bode magnitude plot of a certain
     a network has the pole-zero locations
                                                      control system shows the gain to be
     as shown in the following figure. If

     Z(o) = 3, then Z(s) is :                         –20 dB at the phase cross over

                                                      frequency. What is the gain margin


                                                      expressed as a ratio ?


                                                      (A) 1


                                                      (B) 5
     (A) 3 (s+3) | (s2+2s+3)

     (B) 2 (s+3) | (s2+2s+2)                          (C) 10


     (C) 3 (s–3) | (s2–2s–2)                          (D) 20

     (D) 2 (s–3) | (s2–2s–3)
                                                 10. Laplace transform of      (t–T) is :

8.   Z-transform of x (–n) is :
                                                      (A) constant
     (A) X (Z)
                                                      (B) 1|e–sT
     (B) X (Z–2)

                                                      (C) e–sT
     (C) X (n)

     (D) X (Z–1)                                      (D) s e–sT


                                             5                                     [P.T.O.
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11. Match the List-I with List II and                  12. Match the List-I with List II and
    select the correct answer using the
                                                           select the correct answer using the
    codes given below :
                                                           codes given below :
                  List I
    (a) hfe                                                               List I

    (b) hoe                                                (a) Voltage gain = 10
    (c) hie
                                                           (b) Power gain = 10
    (d) hre
                                                           (c) Power gain = 1000
                         List II
                                                           (d) Voltage gain = 100
            vbe
    (i)     vce I                                                        List II
                    B    constant


            vbe                                            (i)   10 dB
    (ii)     ib V
                    ce    constant
                                                           (ii) 40 dB
            ic
                                                           (iii) 30 dB
    (iii)   vce I
                    b    constant

                                                           (iv) 20 dB
            ic
    (iv)    ib V                                           Codes :
                   ce    constant


    Codes :                                                       (a)    (b)      (c)     (d )

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

    (A)     (iv)         (ii)       (i)    (iii)           (B)    (i)    (iv)     (iii)   (ii)
    (B)     (iv)         (i)        (ii)   (iii)
                                                           (C)    (i)    (iv)     (ii)    (iii)
    (C)     (ii)         (iii)      (iv)   (i)
                                                           (D)    (iv)   (i)      (iii)   (ii)
    (D)     (iv)         (iii)      (ii)   (i)
                                                   6
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13. Schmitt Trigger is a special               16. Regulated output voltage of a 3-pin
    configuration of :                             fixed voltage regulator can be
                                                   increased :
    (A) Open loop op-amp                           (A) Adding external pass transistor

    (B) Differential input op-amp                  (B) By increasing ground pin
                                                       voltage
    (C) Positive feedback op-amp                   (C) Cascading with another 3-pin
                                                       voltage regulator
    (D) Negative feedback op-amp
                                                   (D) Using voltage doubler at input
14. ID and VGS notations in a FET              17. Match the List-I with List II and
                                                   select the correct answer using the
    denote the following parameters :
                                                   codes given below :
    (A) Total instantaneous values                 List I (Configuration) :
                                                   (a) Common emitter
    (B) Instantaneous ac values
                                                   (b) Common collector
    (C) Phasor values                              (c)   Common base
                                                   (d) Emitter follower
    (D) DC values
                                                   List II (Characteristics) :
15. For fabrication of current mirror in           (i)   High input resistance
    an integrated circuit the following            (ii) Low output resistance
    components are required :                      (iii) Moderate input resistance
                                                   (iv) Low input resistance
    (A) Two transistors
                                                   Codes :
    (B) One     transistor   and    one                   (a)     (b)       (c)     (d )

         MOSFET                                    (A)    (i)     (iii)     (iv)    (ii)
                                                   (B)    (i)     (ii)      (iii)   (iv)
    (C) Two transistors in super   mode            (C)    (iii)   (ii)      (iv)    (i)

    (D) One transistor and Al reflector            (D)    (iv)    (ii)      (i)     (iii)

                                           7                                                [P.T.O.
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18. Match the List-I with List II and           19. In successive approximation ADC

    select the correct answer using the             offset voltage equal to 1/2 LSB is
                                                    added to the D/A converter's output.
    codes given below :
                                                    This is done to :
                 List I                             (A) Improve the speed of operation

    (a) Voltage gain                                (B) Reduce maximum quantization
                                                          error
    (b) Current gain
                                                    (C) Increase the number of bits at
    (c) Power gain                                        the output

    (d) Output resistance                           (D) Increase the range of input
                                                          voltage that can be converted
                   List II
                                                20. The main difference between JK and
    (i)   Very high CE                              RS flip-flop is that :

    (ii) Very low in CC                             (a) JK flip-flop requires clock input

    (iii) High in CB                                (b) There is a feedback in JK flip-
                                                          flop
    (iv) Low in CB
                                                    (c) JK flip-flop accepts both inputs
    Codes :                                               as high

                                                    (d) JK flip-flop is similar to D-flip
           (a)      (b)     (c)     ( d)
                                                          flop
    (A)    (iii)    (iv)    (i)     (ii)
                                                    (A)    a and b
    (B)    (ii)     (iii)   (iv)    (i)             (B)    b only

    (C)    (ii)     (iv)    (iii)   (i)             (C)    a and c

    (D)    (ii)     (iv)    (i)     (iii)           (D)    b and d

                                            8
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21. In a D flip-flop output Q = Input D       23. Match the pairs and select the

    when :                                        correct answer from the codes given
                                                  below :
    (a) The output is low
                                                  (a) GAL

    (b) The output is high                        (b) PAL

                                                  (c)   CPLD
    (c) Clock is enabled
                                                  (d) FPGA
    (d) Both reset and set input
                                                  (e)   EEPROM
        disabled
                                                  (i)   Complex programmable logic
    (A) (c)                                             device

                                                  (ii) Field programmable gate array
    (B) (a) and (b)
                                                        logic

    (C) (a) and (c)                               (iii) Programmable array logic

                                                  (iv) Gate      array       logic       devices
    (D) (c) and (d)
                                                        (generic)
22. How many entries will be there in             (v) Electrical erasable program-
    the truth table of a 3 input NAND                   mable read only memory.

    gate ?                                        Codes :
                                                         (a)     (b)       (c)     (d )     (e)
    (A) 3
                                                  (A)    (ii)    (i)       (iv)    (iii)    (v)
    (B) 6
                                                  (B)    (i)     (ii)      (iii)   (iv)     (v)

    (C) 9                                         (C)    (i)     (iv)      (iii)   (v)      (ii)

                                                  (D)    (iv)    (iii)     (i)     (ii)     (v)
    (D) 8
                                                  (E)    (iii)   (iv)      (ii)    (i)      (v)
                                          9                                                [P.T.O.
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24. Match the List-I with List II and           25. Which of the following 8051
    select the correct answer using the             instruction perform the move
    codes given below :                             accumulator to external RAM of
                                                    16-bit address ?
                   List I
                                                    (A) MOV @ D PTR, A
    (a) Sequential logic circuits
                                                    (B) MOV X @ Ri, A
    (b) Combination logic circuits
                                                    (C) MOV A, @ Ri
    (c) Synchronous sequential logic
                                                    (D) MOV X @ DPTR, A
    (d) Asynchronous logic circuits
                                                26. In 8085 microprocessor, RST 6
                   List II
                                                    instruction transfers program
    (i)   Independent of clock signal
                                                    execution    to     the   following
    (ii) Depends on clock signal                    location :
    (iii) Combinational circuit with                (A) 0024 H
          storage element as feedback
                                                    (B) 0030 H
          path
                                                    (C) 0048 H
    (iv) Decoder, multiplexers
                                                    (D) 0060 H
    Codes :
                                                27. SIM instruction in 8085 stands
           (a)     (b)     (c)     ( d)
                                                    for :
    (A)    (ii)    (iii)   (i)     (iv)
                                                    (A) select interrupt mask
    (B)    (iii)   (iv)    (ii)    (i)
                                                    (B) sort interrupt mask
    (C)    (i)     (iv)    (iii)   (ii)
                                                    (C) set interrupt mask
    (D)    (ii)    (i)     (iv)    (iii)
                                                    (D) subscribe interrupt module

                                           10
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28. The register which acts as 'receive'        30. Match List I with List II and select
    and 'transmit' buffer in serial                 the correct answer using codes given
    communication in 8051 is :
                                                    below :
    (A) SCON
                                                                 List I
    (B) PCON
    (C) SBUF                                        (a) Port 0 (SFR 80 H)
    (D) Accumulator                                 (b) Port 1 (SFR 90 H)
29. Match List I with List II and select
                                                    (c)   Port 2 (SFR A0 H)
    the correct answer using codes given
    below the list :                                (d) Port 3 (SFR B0 H)
                   List I
                                                                 List II
    (a) S1 = 0, S0 = 0
    (b) S1 = 0, S0 = 1                              (i)   Quasi Bi-directional general

    (c) S1 = 1, S0 = 0                                    purpose

    (d) S1 = 1, S0 = 1                              (ii) Content of DPL
                   List II
                                                    (iii) Serial data communication/
    (i)   OPCODE FETCH
                                                          interrupts
    (ii) READ
                                                    (iv) External memory HIGH byte
    (iii) HALT
    (iv) WRITE                                       Codes :
    Codes :                                               (a)    (b)      (c)     (d )
           (a)     (b)    (c)     ( d)
                                                     (A) (ii)    (i)      (iii)   (iv)
    (A)    (i)     (ii)   (iii)   (iv)
    (B)    (iii)   (iv)   (ii)    (i)                (B) (ii)    (i)      (iv)    (iii)

    (C)    (ii)    (i)    (iv)    (iii)              (C) (i)     (ii)     (iii)   (iv)
    (D)    (iv)    (i)    (ii)    (iii)
                                                     (D) (ii)    (iv)     (iii)   (i)

                                           11                                             [P.T.O.
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Instructions (Q. Nos. 31 to 40) :                  31. Assertion (A) :

    Assertion-Reason type questions :                  Tunnel diode is used as a memory
                                                       element.
    The following items consist of two
                                                       Reason (R) :
    statements,      one    labelled    as
                                                       It has negative resistance
    'Assertion (A)', and the other labelled            characteristics due to quantum
    the 'Reason (R)'. You are to examine               mechanical effect.

    these two statements and decide if             32. Assertion (A) :

    the Assertion (A) and the Reason (R)               Superposition theorem is not
                                                       applicable for power calculations.
    are individually true and if so,
                                                       Reason (R) :
    whether the reason is a correct
                                                       Power is a non-linear quantity.
    explanation of the Assertion.
                                                   33. Assertion (A) :
    Select your answer to these items
                                                       Op-amp has high input impedance.
    using the codes given below and
                                                       Reason (R) :
    mark your answer sheet accordingly.
                                                       Op-amps have low input offset
    Codes :                                            current.
                                                   34. Assertion (A) :
    (A) Both (A) and (R) are true and
                                                       In order to synchronise a Mealy type
        (R) is the correct explanation of
                                                       circuits the inputs of the sequential
        (A)                                            circuit must be synchronized with
    (B) Both (A) and (R) are true but                  the clock and the outputs must be
                                                       sampled only during the clock edge.
        (R)    is   not    the    correct
                                                       Reason (R) :
        explanation of (A)
                                                       In Mealy model the outputs may
    (C) (A) is true but (R) is false                   change if input changes during the
                                                       clock period and output may have
    (D) (A) is false and (R) is true
                                                       momentary false values.

                                              12
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35. Assertion (A) :                               39. Assertion (A) :

    PWM signal can be easily generated                Graded index optical fibers are used
    by 8051.                                          for reasonably high band width
    Reason (R) :                                      application.

    It has built in timer/count.                      Reason (R) :

36. Assertion (A) :                                   Graded index fibers are designed to

    The result of a logical and operations            have low time dispersion.
    in C will be true only if both                40. Assertion (A) :
    operands are true.
                                                      A hot wire ammeter has a cramped
    Reason (R) :                                      scale.
    The result of a logical or operations             Reason (R) :
    will be true if either operand is true
                                                      The heat is proportional to square
    or if both operands are true.
                                                      of current.
37. Assertion (A) :
                                                      Read the following paragraph and
    A stub is shorted or open section of
                                                      answer the question Nos. 41 to 45 :
    transmission line used inconjun-
    ction with transmission line.                     An oscillator having initially been
                                                      set at a particular frequency will
    Reason (R) :
                                                      generally drift and wander about in
    A stub cancel out reflections and
                                                      frequency. The frequency stability of
    provide impedance match.
                                                      an oscillator is a measure of its
38. Assertion (A) :                                   ability to maintain as nearly a fixed
    From SNR point of view, FM is                     frequency as possible over as long
    superior to PM by a factor of 3.                  a time as possible. These deviations
                                                      of frequency arise because the
    Reason (R) :
                                                      values of critical features, on which
    Narrowband        FM     offers    no
                                                      the oscillator frequency depends, do
    improvement in SNR over AM.

                                             13                                     [P.T.O.
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not remain constant in time. The                  dependent, whereas the frequency

critical features include circuit                 dependence on the far larger number

components, transistor parameters,                of features is comparatively slight.
supply voltage, stray capacitances                For example the frequency of phase

etc. Accordingly, an obvious but                  shift oscillator primarily depends on

clearly useless solution of the                   R and C and other parameters do
                                                  not affect it too much. In a parallel
problem of making a frequency
                                                  resonant circuit the impedance
stable oscillator is to keep all these
                                                  changes from an inductive to a
features constant. In the first place,
                                                  capacitive         reactance   as   the
the number of circuit features is very
                                                  frequency is increased through
large and some of the features like
                                                  resonance point. If the Q is infinite
transistor parameters are inherently              this change in phase is abrupt.
unstable and extremely difficult to               Hence a tuned circuit oscillator will
keep constant. Moreover, it is hard               have excellent frequency stability
to know where stray circuit elements              independent of temperature, current

and couplings are located and how                 etc.

to estimate their magnitudes. Thus            41. The frequency of any oscillator is :
making it difficult to maintain them              (A) Unstable
constant.
                                                  (B) Constant
However, it is recognized that in                 (C) Not dependent on component
every oscillator circuit there are                       selection
relatively few circuit features on
                                                  (D) Decided by semiconductor
which the frequency is sensitively                       device only

                                         14
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42. Which among the following is a              44. The frequency of a phase shift
    false statement ?                                oscillator :

    (A) An oscillator would not produce              (A) depends heavily on parasitic
                                                         components
           constant frequency
                                                     (B) is decided basically by amplifier
    (B) The tuned circuit oscillator is
                                                         gain
           highly unstable
                                                     (C) depends primarily on R and C
    (C) Transistor parameters are                        only

           inherently unstable                       (D) is independent of temperature,
                                                           current etc.
    (D) Stray circuit elements and
                                                45. The tuned oscillator has excellent
           couplings affect stability of            frequency stability because :
           oscillator                                (A) the frequency is basically
43. An effective solution to maintain                    decided by R and C

    oscillation frequency highly stable              (B) the change in phase is abrupt
                                                         due to high Q
    is :
                                                     (C) supply voltage is highly stable
    (A) Switch off the circuit
                                                     (D) stray capacitances are of large
    (B) To identify the stray compo-                     value

           nents and bypass them                46. A stream of type .................... can be
                                                     connected to a file with a call to the
    (C) Choose a circuit configuration
                                                     member function open.
           which does not have large
                                                     (A) ifstream
           number of critical features
                                                     (B) ofstream
    (D) Make the circuit impedance                   (C) both (A) & (B)
           high
                                                     (D) object

                                           15                                           [P.T.O.
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47. A do-while loop always executes its                  50. Match the List-I with List II and
     loop body at least ..................                   select the correct answer using the

     (A) twice                                               codes given below :

     (B) three times                                                         List I

                                                             'C' Function
     (C) once
                                                             (a) a cos (d)
     (D) four times
                                                             (b) abs (i)
48. All subtasks in a program can be
                                                             (c) fprint (f, ..........)
     implemented as functions, either as
                                                             (d) time (p)
     functions that return a value or

     as .....................                                               List II

                                                             Include File
     (A) Return-function
                                                             (i)   time.h
     (B) Void-functions
                                                             (ii) stdio.h
     (C) Call functions
                                                             (iii) math.h
     (D) All of the above
                                                             (iv) stdlib.h
49. A ......................... is a program that            Codes :
     does nothing but test a function.
                                                                   (a)       (b)       (c)     (d )
     (A) Hello program                                       (A) (i)         (ii)      (iii)   (iv)
     (B) Print program                                       (B) (iii)       (iv)      (ii)    (i)

     (C) Interrupt program                                   (C) (iv)        (iii)     (ii)    (i)

     (D) Driver program                                      (D) (ii)        (iii)     (iv)    (i)


                                                    16
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51. Match the List-I with List II and          53. A train of pulses with each pulse
    select the correct answer using the            30 s wide and having an inter-
    codes given below :                            pulse separation of 20         s is
                                                   propagating through a transmission
                   List I
                                                   line. How long should the
    Expression in 'C'
                                                   transmission line be in meters so
    (a) dx + x                                     that exactly three pulses are on the
    (b) ((int) dx) + ix                            line at a time ? Assume propagation
    (c) i + c                                      speed to be 3 × 108 m/s.
    (d) x + c                                      (A) 2.5 km
                 List II                           (B) 3.9 km
    Data type                                      (C) 25 km
    (i)   long integer                             (D) 39 km
    (ii) double - precision                    54. The Maxwell's equation
    (iii) float or double float
    (iv) integer                                                           D
                                                         H   J cond            for
                                                                           t
    Codes :
         (a)       (b)     (c)    ( d)             free space becomes :
    (A) (iv)       (iii)   (ii)   (i)              (A)       H   0
    (B) (i)        (ii)    (iv)   (iii)
                                                   (B)       H    J cond
    (C) (ii)       (i)     (iv)   (iii)
    (D) (iii)      (iv)    (ii)   (i)                                 D
                                                   (C)       H
52. For a given rectangular wave guide,                               t
    the cut-off frequency for TE10 mode            (D)       H   infinite
    is always :
                                               55. Back bombardment of the cathode
    (A) Lower than that for the TE11               occurs in ...................
        mode
                                                   (A) Klystron
    (B) Higher than that for the TE11
                                                   (B) Magnetron
        mode
    (C) Equal to that for the TE11 mode            (C) Vacuum tubes

    (D) Zero                                       (D) GaAs FET

                                          17                                         [P.T.O.
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56. Match List I with List II and select                     57. Match List I with List II and select
    the correct answer using codes given
                                                                 the correct answer using codes given
    below :
                                                                 below :
                          List I
    (a) Maxwell's equation based on                                             List I
        Ampere's law                                             (a) Gunn diode
    (b) Maxwell's second equation
                                                                 (b) GaAs FET
        based on Faraday's law
    (c) Maxwell's third equation based                           (c) Conventional transistor
        on Gauss' law                                            (d) Pin diode
    (d) Maxwell's fourth equation
                                                                                List II
        based on non-existence of
        magnetic monopole                                        (i)   exhibit stray capacitances and
                      List II                                          inductances               at          higher
                                                                       frequencies
    (i)     ·B        0
                                                                 (ii) has small capacitance when
                                        D
    (ii)          H             J                                      reverse biased
                                         t
                                                                 (iii) transferred electron device
    (iii)   ·D
                                                                 (iv) used in low noise amplifier
                                    B
    (iv)          E
                                t                                Codes :
     Codes :
                                                                        (a)     (b)       (c)         (d )
            (a)           (b)           (c)     ( d)
                                                                 (A)    (iii)   (iv)      (i)         (ii)
    (A)     (ii)          (iv)          (i)     (iii)
                                                                 (B)    (iii)   (iv)      (ii)        (i)
    (B)     (iv)          (ii)          (i)     (iii)
                                                                 (C)    (iv)    (iii)     (ii)        (i)
    (C)     (ii)          (iv)          (iii)   (i)
                                                                 (D)    (i)     (iii)     (iv)        (ii)
    (D)     (ii)          (i)           (iii)   (iv)

                                                        18
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                                               62. Match the Column I with Column
58. In FM superheterodyne receiver, the            II and select the correct answer
    beat frequency is :                            using the codes given below :
                                                            Column I
    (A) 910 kHz                                    (P) Low Pass Filter
                                                   (Q) High Pass Filter
    (B) 455 kHz
                                                   (R) Band Pass Filter
    (C) 21.14 MHz                                  (S) FIR Filter
                                                            Column II
    (D) 10.7 MHz
59. Superheterodyne AM receiver has :
    (A) Delayed AGC
    (B) AGC                                        (1)
    (C) No AGC
    (D) Ideal AGC
60. A Hilbert transformer is a :
    (A) Non-linear System
    (B) Non-causal System                          (2)
    (C) Time-varying System
    (D) Low Pass System

61. Consider the following system :

                                                   (3)


    Impulse response h(t ) is a filter
    matched to x ( t ). The Fourier
    transform of the output y(t) shall
    be :                                           (4)
    (A) e   f2

    (B) e 2 f 2                                    Codes :
                                                   (A)   P–3,   Q–1,   R–2,   S–4
    (C) e   f 22                                   (B)   P–1,   Q–3,   R–2,   S–4
                                                   (C)   P–1,   Q–3,   R–4,   S–2
    (D) e |f |                                     (D)   P–3,   Q–1,   R–4,   S–2
                                          19                                        [P.T.O.
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63. Match the Column I with Column                64. Turn off time of an SCR in series
                                                      with RL circuit can be reduced
    II and select the correct answer
                                                      by :
    using the codes given below :
                                                      (a) increasing circuit resistance R

               Column I                               (b) decreasing circuit resistance R

                                                      (c) increasing circuit inductance L
    (P) Km (t) A sin ( ct)
                                                      (d) decreasing circuit inductance L
    (Q) A sin [ ct + Km(t)]
                                                      Options :

    (R) [1 + Km (t)] A sin ( ct)                      (A) b and d

                                                      (B) a and d
                           t

    (S) A sin    ct    K       m(t)d                  (C) b and c
                           –

                                                      (D) d only
             Column II
                                                  65. For an SCR with turn-on time of 5 s,
    (W) PM                                            an ideal trigger pulse should
                                                      have :
    (X) FM
                                                      (A) Short rise time with pulse width
    (Y) AM
                                                             = 3   s
    (Z) DSBSC                                         (B) Long rise time with pulse width
                                                             = 6   s
    (A) P–Z,    Q–W,       R–Y,        S–X
                                                      (C) Short rise time with pulse width
    (B) P–W,    Q–Z,       R–Y,        S–X
                                                             = 6   s
    (C) P–X,    Q–W,       R–Z,        S–Y            (D) Long rise time with pulse width

    (D) P–Y,    Q–Z,       R–W,        S–X                   = 3   s

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66. Match List I with List II and select                  67. The following are the components in

    the correct answer using codes given                      optical communication :
    below :
                                                              (i)    Modulator
                   List I

    (a) Single       phase         full     bridge            (ii) Wavelength Division Multiplexer
          inverter
                                                              (iii) Repeaters
    (b) Power device combining BJT
          and MOSFET                                          (iv) Time Division Multiplexer

    (c) Device conducting during OFF                          The correct sequence of their
          period of SCR
                                                              placement from transmission side
    (d) Circuit used for converting low
                                                              is :
          voltage dc to high voltage dc

                   List II                                    (A) (i)     (iii)    (ii)   (iv)

    (i)   step up chopper                                     (B) (ii)    (iii)    (iv)   (i)
    (ii) free wheeling diode
                                                              (C) (iv)    (ii)     (i)    (iii)
    (iii) IGBT
                                                              (D) (i)     (iv)     (ii)   (iii)
    (iv) can be operated in Load
          commutation mode                                68. The following is the most important
    Codes :                                                   requirement for laser :
           (a)     (b)     (c)       ( d)
                                                              (A) Optical pumping
    (A)    (i)     (ii)    (iii)     (iv)

    (B)    (ii)    (iii)   (iv)      (i)                      (B) Stimulated emission

    (C)    (iii)   (ii)    (i)       (iv)                     (C) Positive feedback

    (D)    (iv)    (iii)   (ii)      (i)                      (D) Current modulation

                                                     21                                           [P.T.O.
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69. Match List I with List II and select        71. Which         of     the      following     are
    the correct answer using codes given            piezoelectric substances ?
    below :                                         (1) Barium titanate
                    List I                          (2) Lead titanate
          (Optical Wavelength)                      (3) Lead zirconate
    (a) 1440 nm                                     (4) Cadmium and sulphate
    (b)    850 nm                                   (A) 1, 2 and 4
    (c) 1300 nm
                                                    (B) 1, 3 and 4
    (d) 1550 nm
                                                    (C) 1, 2 and 3
                    List II
                                                    (D) 2, 3 and 4
    (i)    Low loss
                                                72. Match List I with List II and select
    (ii) High speed
                                                    the correct answer using codes given
    (iii) High loss
                                                    below :
    (iv) Low cost
                                                                       List I
    Codes :
                                                    (a) Electron microscope
         (a)        (b)    (c)    ( d)
                                                    (b) Oscilloscope
    (A) (i)         (ii)   (iv)   (iii)
                                                    (c) Galvanometric recorder
    (B) (iv)        (i)    (ii)   (iii)
                                                    (d) Magnetic recorder
    (C)     (iii)   (iv)   (ii)   (i)
    (D)     (i)     (ii)   (iv)   (iii)                                List II

70. The drawbacks of strain gauges                  (i)   Electron gun
    are :                                           (ii) Condensing magnetic lens
    S1 : Low fatigue life                           (iii) Recording head
    S2 : They are expensive, brittle                (iv) Drive motor
         and sensitive to temperature               Codes :
    S3 : Poor linearity                                    (a)         (b)       (c)    (d )
    (A) S1 and S2                                   (A)    (ii)        (iv)      (i)    (iii)
    (B) S2 and S3                                   (B)    (ii)        (iii)     (i)    (iv)
    (C) S1 and S3                                   (C)    (iii)       (ii)      (iv)   (i)
    (D) S1 only                                     (D)    (ii)        (i)       (iv)   (iii)
                                           22
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73. The order and type of the system               75. Match List I with List II and select
                                                       the correct answer using codes given
    shown in the following figure is :
                                                       below :
                                                                      List I
                                                       (Characteristic Equation of
                                                                   the System)
                                                      (a) s5 + s4 + 2s3 + 2s2 + 3s + 15 = 0
    (A) Type : 1, Order : 3
                                                      (b) s6 + 2s5 + 8s4 + 12s3 + 20s2 +16s
    (B) Type : 3, Order : 1                               + 16 = 0

    (C) Type : 2, Order : 2                           (c) G(s) H(s) = 10/s (s + 2) (s + 5)
    (D) Type : 1, Order : 1                                         s+5
                                                      (d) G(s) = s2 + 4s + 9
74. Consider the following statements
    regarding root loci.
                                                                      List II
    (1) All root loci start from the
                                                        (Stability of the System)
        respective poles of G (s) H (s)
                                                       (i)   marginally stable
    (2) All root loci end at the respective
                                                       (ii) unstable
        zeros of G(s) H(s) or go to
                                                       (iii) stable
        infinity.
                                                       (iv) phase angle of the system varies
    (3) The root loci are symmetrical
                                                             between 0° and –90°.
        about the imaginary axis of the
        S-plane.                                        Codes :
                                                             (a)      (b)       (c)     (d )
    Of these statements :
                                                        (A) (ii)      (i)       (iii)   (iv)
    (A) 1, 2 and 3 are correct
                                                        (B) (i)       (ii)      (iii)   (iv)
    (B) 1 and 2 are correct
                                                        (C) (iii)     (iv)      (i)     (ii)
    (C) 2 and B are correct
                                                        (D) (iv)      (iii)     (ii)    (i)
    (D) 1 and 3 are correct
                                              23                                               [P.T.O.
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ROUGH WORK




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