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

  • Date: 28 January 2018
  • Paper code: JAN38218
  • Series: A
  • Language: Bilingual
  • 16 pages
MH SET 2018 question paper, 28 January 2018, Paper II, Electronic Science, page 1 of 16
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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 - 38218                                                                                          (To be filled by the Candidate)
Time Allowed : 1¼ Hours]                                                                            [Maximum Marks : 100
Number of Pages in this Booklet : 16                                                   Number of Questions in this Booklet : 50
                     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 50 objective type questions. Each question
          will carry two marks. All questions of Paper-II 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               (i)
                   a booklet without sticker-seal or open booklet.
          (ii)     Tally the number of pages and number of questions
                   in the booklet with the information printed on the                     (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
                   from the invigilator within the period of 5 minutes.
                   Afterwards, neither the Question Booklet will be
                   replaced nor any extra time will be given. The same
                   may please be noted.
          (iii)    After this verification is over, the OMR Sheet Number
                   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.
8.        If you write your Name, Seat Number, Phone Number or put               6.
          any mark on any part of the OMR Sheet, except for the space            7.
          allotted for the relevant entries, which may disclose your             8.
          identity, or use abusive language or employ any other unfair
          means, you will render yourself liable to disqualification.
9.        You have to return original OMR Sheet to the invigilator at the
          end of the examination compulsorily and must not carry it with         9.
          you outside the Examination Hall. You are, however, allowed
          to carry the Test Booklet and duplicate copy of OMR Sheet on
          conclusion of examination.
10.       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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                               Electronic Science
                                         Paper II
Time Allowed : 75 Minutes]                                        [Maximum Marks : 100

Note : This Paper contains Fifty (50) multiple choice questions. Each question
        carries Two (2) marks. Attempt All questions.


1.   The potential barrier in a pn -                 3.   Most of the majority carriers from
     junction is formed after stabilizing
                                                          the emitter :
     the carrier transport. Under this
     condition :                                          (A) Recombine in the base

     (A) Drift Current > Diffusion
                                                          (B) Recombine in the emitter
          Current
                                                          (C) Pass through the base region to
     (B) Drift Current < Diffusion
          Current                                             the collector

     (C) Drift Current = Diffusion                        (D) Remain in the base
          Current
                                                     4.   An enhancement type, basically
     (D) Drift Current >> Diffusion
          Current                                         termed as normally OFF N-

2.   In the breakdown region, a Zener                     MOSFET works only with :
     diode behaves like a..............source.
                                                          (A) Large positive gate voltage
     (A) Constant voltage
                                                          (B) Large negative gate voltage
     (B) Constant current

     (C) Constant current sink                            (C) Large positive drain voltage

     (D) Constant power                                   (D) Large negative drain voltage

                                                 3                                   [P.T.O.
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5.   The process of selectively removing       7.   The voltage V in the circuit shown

     certain protective regions from the            in the following figure is :

     surface of a substrate is known

     as :

     (A) Epitaxy

     (B) Lithography
                                                    (A) 10 V
     (C) Metalization                               (B) 15 V

     (D) Bonding                                    (C) 5 V
                                                    (D) 3 V
6.   Refer to the network shown in the         8.   In the graph shown in the following
     following figure :                             figure, the number of trees (P) and
                                                    the number of cut sets (Q) are :




     The tie set matrix is :

     (A) [1, 1]

     (B) [4, 4]                                     (A) P = 2, Q = 2
                                                    (B) P = 2, Q = 6
     (C) [10, 25]
                                                    (C) P = 4, Q = 6
     (D) [10, 4]
                                                    (D) P = 4, Q = 10

                                           4
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9.   The Fourier series of a real periodic       11. Calculate the cut-off frequency of an
     function has only :
                                                     OP-Amp based first order low pass
     P : cosine terms if it is even
                                                     filter for R = 2·5 k     and C = 0·05
     Q : sine terms if it is odd
                                                       F.
     R : cosine terms if it is odd
                                                     (A) 1·273 kHz
     S : sine terms if it is even

     Which of the above statements are               (B) 12·73 kHz

     correct ?
                                                     (C) 127·3 kHz
     (A) P and S
                                                     (D) 127·3 Hz
     (B) P and Q
                                                 12. Current sense resistor in a voltage
     (C) P and R

                                                     regulator circuit is placed at :
     (D) Q and R

10. The trigonometric Fourier series of              (A) Across the pass transistor

     a periodic time function can have
                                                     (B) Parallel to the load resistor
     only :

     (A) cosine terms                                (C) In series with emitter of pass


     (B) sine terms                                         transistor

     (C) DC and cosine terms                         (D) In series with the collector of

     (D) cosine and sine terms                              pass transistor

                                             5                                     [P.T.O.
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13. According to transfer characteristics         15. The output of a rectifier circuit

    of XLL the phase error between                    without filter is :

    VCO output and incoming signal
                                                      (A) 50 Hz AC
    must be maintained between.............
                                                      (B) Smooth DC
    in order to maintain a lock.

                                                      (C) Pulsating DC
    (A) 0 and

                                                      (D) 25 Hz DC
    (B) 0 and    /2

                                                  16. For a NAND gate having two inputs
    (C) 0 and 2

                                                      the output is low (0) only :
    (D)    and 2

                                                      (A) When both inputs are high
14. Voltage regulator LM 723 is best

    suited for voltage regulation :                   (B) When both inputs are low


    (A) 0 to 40 V                                     (C) When any one of the inputs is


    (B) 0 to 27 V                                         high and other is low


    (C) 9·5 to 40 V                                   (D) When a specified input is high


    (D) 2 to 37 V                                         and other is low

                                              6
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17. Synchronous counters are different         19. Boolean algebra does not apply to

    from ripple counters in which clock
                                                   the relation :

    pulses are applied ?
                                                   (A) 0 + 0 = 0
    (A) In cascade manner to all flip-

                                                   (B) 0 + 1 = 1
        flops


    (B) To the inputs of all flip-flops            (C) 1 + 1 = 1


    (C) To the even number of flip-flops           (D) 0 – 1 = 1


    (D) To the odd number of flip-flops
                                               20. Commutative law for addition and

18. An OR gate in positive logic
                                                   multiplication holds good for :

    functions as :
                                                   (A) OR gate only
    (A) AND gate in Negative logic

                                                   (B) AND gate only
    (B) NAND gate in Negative logic

                                                   (C) Both OR and AND gate
    (C) NOR gate in Negative logic


    (D) NOT gate in Negative logic                 (D) NOT gate only

                                           7                                  [P.T.O.
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                                               23.   IO/M signal is generally used for
21. What is the order decided by a

                                                     distinguishing between :
    processor or the CPU of a controller
                                                     (A) Data entry from keyboard and
    to execute an instruction ?
                                                         memory device

    (A) Decode, fetch, execute
                                                     (B) Memory mapped IOs and IO


    (B) Execute, fetch, decode                           mapped IOs


                                                     (C) Serial       and       parallel
    (C) Fetch, execute, decode
                                                         communication

    (D) Fetch, decode, execute
                                                     (D) Synchronous and asynchronous

22. An internal RAM memory of the                        data transfers


    8051 is :                                  24. When PUSH PSW instruction is

                                                     executed, the stack pointer :
    (A) 32 bytes
                                                     (A) Decrements by 1
    (B) 64 bytes
                                                     (B) Increments by 1

    (C) 128 bytes
                                                     (C) Increments by 2


    (D) 64 k bytes                                   (D) Decrements by 2

                                           8
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25. The width of the instruction queue/              28. In C++/C operators such as.............

     pipeline in 8086 microprocessor is :                 cannot be overloaded.

     (A) 4-bytes                                          (A) +

                                                          (B) + +
     (B) 6-bytes
                                                          (C) : :
     (C) 8-bytes
                                                          (D) = =
     (D) 2-bytes
                                                     29. The first index number in an array
26. In C++ .................. operator is used
                                                          starts with................and the index
     for Dynamic memory allocation.                       number of an array of size n will

     (A) Scope resolution                                 be :

     (B) Conditional                                      (A) 0, n – 1

                                                          (B) 1, n – 1
     (C) New
                                                          (C) 0, n
     (D) Membership access
                                                          (D) 1, n
27. The.................objects have values
                                                     30. To overload an operator..................
     that can be tested for various error
                                                          keyword must be used along with
     conditions.
                                                          the operator to be overloaded.
     (A) osstream
                                                          (A) Over
     (B) ofstream
                                                          (B) Overload
     (C) stream                                           (C) Void

     (D) ifstream                                         (D) Operator

                                                 9                                       [P.T.O.
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31. Ohm’s law     when     applied   to        33. A   transmission      line   when

   electromagnetic phenomenon gives                terminated in a certain load has a

   the following expression :                      reflection coefficient of 1/3. What

                                                   will be the VSWR ?
   (A) J    E

                                                   (A) 1
   (B) V = IR

                                                   (B) 2
   (C)     JE

                                                   (C) 2·5
   (D) E   J

                                                   (D) 3
32. What is the amplitude of the

   displacement current density in             34. In which of the following devices

   A/m2 inside a capacitor where D =               mobility of the electrons decreases

   3 × 10–7 sin (6 × 107t – 0·35x) aˆ z            as the electric field strength

   C/m2 and     r = 100.
                                                   increases over a certain range ?


   (A) 3 A/m2                                      (A) Si


   (B) 6 A/m2                                      (B) Ge


   (C) 9 A/m2                                      (C) GaAs


   (D) 18 A/m2                                     (D) Metals

                                          10
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35. A Gunn diode of thickness 7 m has             37. The maximum dynamic range for a

     a drift velocity of 1 × 105 m/s, find            linear PCM system using 16-bit


     the transit time of an electron :                quantizing :


                                                      (A) 98·08 dB
     (A) 7 × 10–11 s

                                                      (B) 49·04 dB
     (B) 7 × 10–1 s

                                                      (C) 32 dB
     (C) 7 × 10–6 s

                                                      (D) 16 dB
     (D) 7 s

                                                  38. A modular transmits symbols, each
36. A signal x1(t) is bandlimited to 2 kHz
                                                      of which has sixty four different
     while x2(t) is bandlimited to 3 kHz.
                                                      possible states, 10,000 times per
     The Nyquist sampling rate for signal
                                                      second. The baud rate and bit rate
     x1(t) x2(t) shall be :
                                                      are :

     (A) 10 kHz
                                                      (A) 10 kbaud, 60 kb/s

     (B) 4 kHz
                                                      (B) 10 kbaud, 30 kb/s

     (C) 6 kHz                                        (C) 0·64 Mbaud, 60 kb/s

     (D) 12 kHz                                       (D) 10 kbaud, 10 kb/s

                                             11                                 [P.T.O.
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39. Choose the correct statement :               41. TRIAC is a bidirectional power


    (A) Narrowband FM offers better                  electronic device which contains :


         SNR than AM                                 (A) Two BJTs connected in parallel


    (B) Narrowband FM offers poor                    (B) Two    pn    junction   diodes

         SNR than AM                                     connected in series


    (C) Narrowband FM offers no                      (C) Two SCRs connected in reverse

         improvement in SNR over AM                      parallel


    (D) Narrowband FM augments                       (D) Two SCRs connected in series

         SNR as compared to AM                   42. In a step down chopper using pulse

40. In order to transmit at 4·8 kbps over            width modulation, TON = 9 × 10–3 s

    a channel with 3·2 kHz bandwidth,                and TOFF = 1 × 10–3 s. The chopping

    which would be most suitable ?                   frequency is :


    (A) BPSK                                         (A) 200 Hz


    (B) QPSK                                         (B) 1000 Hz


    (C) 8-PSK                                        (C) 500 Hz


    (D) 16-PSK                                       (D) 100 Hz

                                            12
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                                              45. Molecular size of SiO2 in optical
43. Colour of light emitted by LED
                                                  fiber leads to the following :
    depends on :
                                                  (A) Absorption

    (A) Reflector used in construction            (B) Scattering

                                                  (C) Pulse dispersion
    (B) Magnitude of forward bias
                                                  (D) Strain

    (C) Energy band gap
                                              46. Strain gauge is a/an :


    (D) Forward current                           (A) Active device and converts

                                                      mechanical displacement into a

44. Which is the major cause of                       change of resistance.


    dispersion in multimode step index            (B) Passive device and converts

                                                      electrical displacement into a
    optical fiber ?
                                                      change of resistance.

    (A) Intermodal                                (C) Passive device and converts

                                                      mechanical displacement into a
    (B) Material
                                                      change of resistance.

                                                  (D) Active device and converts
    (C) Wave guide
                                                      electrical displacement into a

    (D) Chromatic                                     change of resistance.

                                         13                                   [P.T.O.
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47. Which    of   the    following   are        49. For the system shown in the

                                                    following figures, the damping ratio
    integrating instruments ?
                                                    of closed loop poles is :
    (A) Ammeters


    (B) Voltmeters


    (C) Wattmeters
                                                    (A) 1·5
    (D) Ampere-hour and Watt-hour

         meters                                     (B) 1


48. A piezoelectric force transducer has            (C) 0·5

    a charge sensitivity of 20 pC/N. It
                                                    (D) 0·25
    is connected to a charge amplifier
                                                50. A PI controller increases :
    and overall gain of transducer and
                                                    (A) Type of system by 1
    amplifier is 50 mV/N. The gain of

    the amplifier is :                              (B) Order of system by 1

    (A) 1 mV/pC                                     (C) Type and order of system

    (B) 1·5 mV/pC                                       decreases by 1

    (C) 2·5 mV/pC                                   (D) Type and order of system

    (D) 4 mV/pC                                         increases by 1

                                           14
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Source: Savitribai Phule Pune University. Question paper published by Savitribai Phule Pune University.