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MPSC AE 2023: Maharashtra Electrical Engineering Services Main Examination, Paper 2

  • Paper code: 123
  • Language: Bilingual
  • 6 pages
MPSC AE 2023 question paper, Maharashtra Electrical Engineering Services Main Examination, Paper 2, page 1 of 6
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  EE                                                  2023                                     R18
                                                                                         BOOKLET NO.


                                                                                         400 101

                                 Electrical Engineering
                                              Paper II
  Tirne Allowed : Three Hours                                                   Maximurn Marks:200
  Mediurn: English                                                    Type of Paper: Conventional
                                Question Paper Speeific Instruetions

  Pleoae read eoch of the following instructions corefully before ottempting queetion :
     1. There are EIGHT questions divided in two sections, out of which FI\IE are to be attempted.
    2. Questions no. 1 and 5 are compulsory. Out of the remaining questions, THREE are to be attempted
        choosing at least ONE question from each Sections.                                                     F.1

    3. lhe number of marke earried by a question/sub question is indicated against it.
    4. Keep in mind the word limit indicated in the question if any.                                           a
                                                                                                               FE

    5. Wherever option has been given, only the required number of responses in the serial order
        attempted shall be assessed. Unlese struck off, attempt of a queetion shall be counted even if
        attempted partly. Excees responses shall not be assessed and shall be ignored.
    6. Candidates are expected to answer all the sub-questions of a question together. If sub-question of
        a question is attempted elsewhere (after leaving a few page or afber attempting another question)

        the later eub-question shall be overlooked.
    7. Any page or portion of the page left blank in the Answer Booklet must be clearly struck off.
    8. Unless otherwise mentioned, symbol and notation have their usual standard meanings. Assume
        suitable data, if necessary and indicate the same clearly.
    9. Neat sketches may be drawn, wherever required.
   10. The medium of answer should be mentioned on the answer book as claimed in the application and
        printed on admission card. The answers written in medium other than the authorized medium
        will not be assessed and no marke will be assigned to them.

  Note : 1. Candidates will be allowed to use Scientific (Non-programmable type) calculators.


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MPSC AE 2023 question paper, Maharashtra Electrical Engineering Services Main Examination, Paper 2, page 2 of 6
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                                          SECTIoN - A

Q1. Answer any five of the following :
                                                                                                t

       (a) With reference to operational amplifier explain following terms with their
           ideal and practical values :

            r) Slew rate
           ii) Open loop gain.                                                           (4x2=8)

       (b) With neat circuit diagram explain voltage follower circuit of the operational
           amplifier.                                                                               8

       (c) Draw only block diagram of analog communication system. Name each block.
           Explain function of each block in one line.                                              8

       (d) State difference between the digital combinational and sequential togic
           circuits.                                                                                E

       (e) State advantages of digital communication system.                                        8

       (f) Draw forward and reverse V-I characteristic of thyr"istor (SCR) and clearly
           indicate on it

            r) Holding current
           ii) Latching current
          iii) Effect of increase in gate cument
          iv) Reverse breakdown voltage.                                                            8

       G) In single phase half wave controlled rectifier SCR is fired             angle for a
                                                                         ^t's,'
           resistive load. Derive expression of a average load voltage (Va" ) across load.
           (Assume into the rectifier is pure sinusoidal voltage).
           Also calculate output voltage if
           t) c[=0o
           ii) .,'=TElz or 9oo'
                                                                                         (6+2=g)
MPSC AE 2023 question paper, Maharashtra Electrical Engineering Services Main Examination, Paper 2, page 3 of 6
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GIz. (a) With neat circuit diagram explain op-amp based high pass filter (l"torder) write
         down expression for

         r) Voltage gain (Ay) in terms of operating frequency (f )and cut-offfrequency (fJ
        ii) Maximum pass band gain of the filter (A--.).
        Also draw ideal characteristic of high pass frlter.                              15

    (b) What is modulation ? Why modulation is necessary in communication system ?
        With simple diagram show amplitude modulation and frequency modulation
        used in analog communication system.                                   15

    (c) Do the following :

         ,) Convert (25.75)rcto equivalent binary number.
        ii) Find the 2's complement of given binary number - 11010.                     10

Q8. (a) What is time domain multiplexing used in digital communication system ?
        Draw and explain the block diagram of time domain/division multiplexing
        process used in digital communication circuits.                         15

    (b) With the help of simple schematic diagram explain fundamental circuit of
        series inverter. Also state few disadvantages ofseries inverter.                15

    (c) Draw and explain chopper controlled step-down/buck regulator with suitable
        waveform of the operation.                                                      10

Q . (a) Simplify the following three variable minterms expreesion using algebraic
        simplifieation.
        Y=Im(1,3,5,7)                                                                   15
   (b) Draw symbol, VI characteristics and 2 applications of following power devices
        r) GTO
        ii) MoSFET
       l1, rGBT.                                                                        15

    (c) Discuss various frequency bands and their names/short names used in
        connection with communication system in practice (Any five frequency band
        wilt do).                                                                 10


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MPSC AE 2023 question paper, Maharashtra Electrical Engineering Services Main Examination, Paper 2, page 4 of 6
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                                     SECTION_ B

Q5. Answer any five of the following :
   (a) Draw basic block diagram of electric drive system and explain function
       of each block in one line.                                                     8

   O) Find inverse Laplace transform of the following :
      F(s)=,     1.                                                                   E
        \ / (s+1)s
    (c) Mathematically only express following properties of Fourier transform
        r) Linearity
        ii) Time scaling
       iii) Time shifting
       ,v) Symmetry or duality.                                                       8
   (d) Find the system function and impulse response of the system described by
       the difference equation: y(n) - x(n) + 2x(n- 1) -4x(n-2) + x(n-3).             8
   (e) State advantages and disadvantages of digital frlters over along filters.      8
   (f) A closed loop control system is having forward path TF G(s), feedbaek path
       TF H(s) and input signal R(s). For this system write the formula for system
       error calculation on time domain basis. AIso state on which parameters error
       depends.                                                                       8

   G) State the effect of P, P[ PD controllers on the performance of the control
       system in brief.                                                               8


Q6.(a) Speed control of d.c. separately excited motor is done by single phase fuII
        converter. Show the schematic representation of the operation. Draw the
        supply voltage waveform, output/armature voltage waveform and armature
        current waveform. AIso draw speed-torque characteristics of the operation if
        converter SCR firing angle is increased in steps.                            15
    (b) Determine the solution of following differential equation using Laplace

        transform method.
        q-s9*2y=tify(o)=o*'d+l =r.                                                    lE
         dt'     dt                        dtlt=o
    (c) Determine inverse z transform of the function =
                                                                ,
                                                          (z-5) ("* 4) '
        Solve this problem by Residue Theorem.                                        10
MPSC AE 2023 question paper, Maharashtra Electrical Engineering Services Main Examination, Paper 2, page 5 of 6
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                 Q7. (a) Determine stability of a system whose transfer function is given by
                        TF'=              S*9
                               s5 +1.bs'+zss +4s2 +bs+10
                         For the same system, how many roots are on the LHS of 's'plane ?          r5
                    (b) Obtain state model of the system whose transfer function is
                         V(.) _ s+S
                         uO-J +Bs+4
l
                         Also draw state diagram of the system.                                    15
        rt
                     (c) Two sequences
                         x(n) = {3, 2, 1,2} and h(n) = {7 2 L 2)
                                                         t
                         Determine convolution sum for them by any one method.                     10

                 Q8. (a) What is FACT system ? Benefi.ts offered by FACTS controllers in electrical
                         transmission system. Also state clearly operational difference between SVC
                         (Static VAR Compensator) and STAT COM.                                     15
                    (b) System having openloop transfer function                                         I
                        G(s)n(s)= ,        L      .                                                      I
                                    s(s+1)(s+3)                                                           I
                                                                                                         i1


                                                                                                         {
                        Draw root locus plot and show on it
                          i) Angle of asymptotes
                         ii) Breakaway point
                        iii) Range of 'k'for stability
                        w) Intersection of root locus with imaginary axis.                         L5
                     (c) Ttansfer function of the system is given by
                        Y(:)   s+3
                        U(*) s2+Bs+z
                        Obtain state model of above system in canonical form                       10




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MPSC AE 2023 question paper, Maharashtra Electrical Engineering Services Main Examination, Paper 2, page 6 of 6
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Source: Maharashtra Public Service Commission. Question paper published by Maharashtra Public Service Commission.

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