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Monday, 15 April 2013

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SAIL MANAGEMENT TRAINEE EXAM PAPERS I SAIL ELECTRONICS AND COMMUNICATION EXAM PAPERS I SAIL ELECTRONICS SAMPLE PAPERS I

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STEEL AUTHORITY OF INDIA LIMITED

Sample Exam Papers

Electronics & Communication

Q.1.If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is
  • Triangular
  • Trapezoidal
  • Sinusoidal
  • Rectangular
Q.2.One of the following statement which is true for relative dielectric constant is -
  • It is dimensionless
  • It is not equal to unity for vacuum
  • It’s value for all substances is less than one
  • None
Q.3.Pure metals generally have
  • high conductivity and low temperature coefficient
  • high conductivity and large temperature coefficient
  • low conductivity and zero temperature coefficient
  • low conductivity and high temperature coefficient
Q.4.For small size, high frequency coils, the most common core material is
  • Air
  • Ferrite
  • Powdered ion
  • Steel
Q.5.For an abrupt junction Varactor diode,the dependence of device capacitance (C) on applied reverse bias (V) is given by
  • C a V1/3
  • C a V-1/3
  • C a V1/2
  • C a V-1/2
Q.6.A superconductor is a
  • A material showing perfect conductivity and Meissner effect below a critical temperature
  • A conductor having zero resistance
  • A perfect conductor with highest dimagnetic susceptibility
  • A perfect conductor which becomes resistive when the current density through it exceeds a critical value
Q.7.When a semiconductor based temperature transducer has a temperature coefficient of –2500 mV/0C then this transducer is indeed a
  • Thermistor
  • Forward biased pn junction diode
  • Reverse biased pn junction diode
  • FET
Q.8.The location of lightning arrestor is -
  • Near the transformer
  • Near the circuit breaker
  • Away from the transformer
  • None
Q.9.Time constant of an RC circuit increases if the value of the resistance is -
  • Increased
  • Decreased
  • Neither a nor b
  • Both a and b
Q.10.Intrinsic semiconductors are those which -
  • Are available locally
  • Are made of the semiconductor material in its purest from
  • Have more electrons than holes
  • Have zero energy gaps
Q.11.The primary control on drain current in a JFET is exerted by -
  • Channel resistance
  • Size of depletion regions
  • Voltage drop across channel
  • Gate reverse bias
Q.12.The electrical conductivity of metals which is expressed in ohm-1 m-1 is of the order of -
  • 1010
  • 105
  • 10-4
  • 10-6
Q.13.When biased correctly, a zener diode –
  • acts as a fixed resistance
  • has a constant voltage across it
  • has a constant current passing through it
  • never overheats
Q.14.The current amplification factor adc is given by –
  • IC/IE
  • IC/IB
  • IB/IC
  • IB/IC
Q.15.Compared to bipolars, FETs have
  • high input impedance
  • low input impedance
  • same input impedance
  • none
Q.16.The source-drain channel of JFET is -
  • ohmic
  • bilateral
  • unilateral
  • both a and b
Q.17.A diac is equivalent to a -
  • Pair of SCRs
  • Pair of four layer SCRs
  • Diode and two resistors
  • Triac width
Q.18.When a sample of N type semiconductor has electron density of 6.25 ´1011 /cm3 at 300K and if the intrinsic concentration of carriers in this sample is 2.5 ´ 1013/cm3 then the hole density will be –
  • 106/cm3
  • 103/ cm3
  • 1010/ cm3
  • 1012/ cm3
Q.19.When the two networks shown in fig. are equivalent with respect to the terminals 1 and 2 at all frequencies then the values of CA, LB, LC and CC will be –
  • 0.5, 0.33, 6, 0.166
  • 0.5, 3, 6, 0.66
  • 0.5, 3, 3, 2
  • 0.5, 3, 6, 0.166
Q.20.Poles and zeros of a driving point function of a network are simple and interlace on the jw axis.The network consists of elements –
  • R and C
  • L and C
  • R and L
  • R, L and C
Q.21.The statement 'In any network of linear impedances, the current flowing at any point is equal to the algebraic sum of the currents caused to flow at that point by each of the sources of emf taken separately with all other emf's reduced to zero’ represents -
  • Kirchhoff's law
  • Norton's theorem
  • Thevenin's theorem
  • Superposition theorem
Q.22.One of the following modes which has the characteristics of attenuation becoming less as the frequency is increased and is attractive at icrowave frequencies of circular cylindrical wave guides is –
  • TE1 mode
  • TM01 mode
  • TE01 mode
  • Higher order mode
Q.23.A two-port network is symmetrical if –
  • z11z22 – z12z21 = 1
  • h11h22 – h12h21 = 1
  • AD – BC = 1
  • y11y22 – y12y21 = 1
Q.24.For transmission line load matching over a range of frequencies,it is best to use
  • a balun
  • a broad band directional coupler
  • a double stub
  • a single stub of adjustable position
Q.25.The poles and zeros of a driving point function of a network are simple and interlace on the negative real axis with a pole closest to the origin. It can be realised -
  • by an LC network
  • as an RC driving point impedance
  • as an RC driving point admittance
  • only by an RLC network
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11 comments:

  1. Anonymous13 July 2013 at 09:50

    ans ???

    ReplyDelete
  2. Anonymous13 July 2013 at 09:50

    add ans also...

    ReplyDelete
  3. Anonymous8 January 2014 at 22:28

    Plz add ans

    ReplyDelete
  4. Anonymous13 January 2014 at 00:24


    add answers

    ReplyDelete
  5. Anonymous21 January 2014 at 06:23

    it will be better if you add answers aalso

    ReplyDelete
  6. Unknown9 March 2014 at 09:09

    plz given ans

    ReplyDelete
  7. Anonymous9 March 2014 at 09:10

    plz given answer

    ReplyDelete
  8. Anonymous9 March 2014 at 09:10

    plz given an answer

    ReplyDelete
  9. Anonymous7 March 2015 at 14:28

    plz upload the ans of question no 19 and procedure

    ReplyDelete
  10. Anonymous7 May 2015 at 23:08

    1. One of the following statement which is true for relative dielectric constant is -
    a) It is dimensionless
    b) It is not equal to unity for vacuum
    c) It?s value for all substances is less than one
    d) None
    Answer is :- It is dimensionless


    2. Pure metals generally have-
    a) high conductivity and low temperature coefficient
    b) high conductivity and large temperature coefficient
    c) low conductivity and zero temperature coefficient
    d) low conductivity and high temperature coefficient
    Answer is :- high conductivity and large temperature coefficient


    3. For small size, high frequency coils, the most common core material is
    a) Air
    b) Ferrite
    c) Powdered ion
    d) Steel
    Answer is :- Air


    4. For an abrupt junction Varactor diode, the dependence of device capacitance (C) on applied reverse bias (V) is given by-
    a) C a V1/3
    b) C a V-1/3
    c) C a V1/2
    d) C a V-1/2
    Answer is :- C a V-1/3

    5. A superconductor is a-
    a) A material showing perfect conductivity and Meissner effect below a critical temperature
    b) A conductor having zero resistance
    c) A perfect conductor with highest dimagnetic susceptibility
    d) A perfect conductor which becomes resistive when the current density through it exceeds a critical value
    Answer is :-A material showing perfect conductivity and Meissner effect below a critical temperature

    6. When a semiconductor based temperature transducer has a temperature coefficient of ?2500 mV/0C then this transducer is indeed a-
    a) Thermistor
    b) Forward biased pn junction diode
    c) Reverse biased pn junction diode
    d) FET
    Answer is :- Forward biased pn junction diode

    7. The location of lightning arrestor is -
    a) Near the transformer
    b) Near the circuit breaker
    c) Away from the transformer
    d) None
    Answer is :- Near the transformer


    8. Time constant of an RC circuit increases if the value of the resistance is -
    a) Increased
    b) Decreased
    c) Neither a nor b
    d) Both a and b
    Answer is :- Increased


    9. Intrinsic semiconductors are those which -
    a) Are available locally
    b) Are made of the semiconductor material in its purest from
    c) Have more electrons than holes
    d) Have zero energy gaps
    Answer is :- Are made of the semiconductor material in its purest from


    10. The primary control on drain current in a JFET is exerted by -
    a) Channel resistance
    b) Size of depletion regions
    c) Voltage drop across channel
    d) Gate reverse bias
    Answer is :- Gate reverse bias


    11. The electrical conductivity of metals which is expressed in ohm-1 m-1 is of the order of -
    a) 1010
    b) 105
    c) 10-4
    d) 10-6
    Answer is :- 105


    12. When biased correctly, a zener diode ?
    a) acts as a fixed resistance
    b) has a constant voltage across it
    c) has a constant current passing through it
    d) never overheats
    Answer is :- has a constant voltage across it

    ReplyDelete
  11. Anonymous7 May 2015 at 23:09

    13. The current amplification factor adc is given by ?
    a) IC/IE
    b) IC/IB
    c) IB/IC
    d) IB/IC
    Answer is :- IC/IE


    14. Compared to bipolars, FETs have-
    a) high input impedance
    b) low input impedance
    c) same input impedance
    d) none
    Answer is :- high input impedance


    15. The source-drain channel of JFET is -
    a) ohmic
    b) bilateral
    c) unilateral
    d) both a and b
    Answer is :- both a and b


    16. diac is equivalent to a -
    a) Pair of SCRs
    b) Pair of four layer SCRs
    c) Diode and two resistors
    d) Triac width
    Answer is :- Pair of four layer SCRs


    17. When a sample of N type semiconductor has electron density of 6.25 ? 1011 /cm3 at 300K and if the intrinsic concentration of carriers in this sample is 2.5 ? 1013/cm3 then the hole density will be ?
    a) 106/cm3
    b) 103/ cm3
    c) 1010/ cm3
    d) 1012/ cm3
    Answer is :- 103/ cm3


    18. The statement ?In any network of linear impedances, the current flowing at any point is equal to the algebraic sum of the currents caused to flow at that point by each of the sources of emf taken separately with all other emf?s reduced to zero? represents -
    a) Kirchhoff?s law
    b) Norton?s theorem
    c) Thevenin?s theorem
    d) Superposition theorem
    Answer is :- Superposition theorem


    19. One of the following modes which has the characteristics of attenuation becoming less as the frequency is increased and is attractive at microwave frequencies of circular cylindrical wave guides is ?
    a) TE1 mode
    b) TM01 mode
    c) TE01 mode
    d) Higher order mode
    Answer is :- TE01 mode


    20. A two-port network is symmetrical if ?
    a) z11z22 ? z12z21 = 1
    b) h11h22 ? h12h21 = 1
    c) AD ? BC = 1
    d) y11y22 ? y12y21 = 1
    Answer is :-AD ? BC = 1


    21. For transmission line load matching over a range of frequencies, it is best to use a-
    a) balun
    b) broad band directional coupler
    c) double stub
    d) single stub of adjustable position
    Answer is :- double stub


    22. The poles and zeros of a driving point function of a network are simple and interlace on the negative real axis with a pole closest to the origin. It can be realised -
    a) by an LC network
    b) as an RC driving point impedance
    c) as an RC driving point admittance
    d) only by an RLC network
    Answer is :- only by an RLC network

    ReplyDelete