Ongc Graduate Trainee Exam 2012 Free Online Practice Test

31 Questions

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FOR ELECTRONICS/ELECTRONICS & TELECOMMUNICATION BRANCH EXAM TIME:3 HRS EXAM QUESTIONS: 150 BREAKUP OF QUESTIONS: TECHNICAL:80 QUESTIONS GENERAL AWARENESS:40 QUESTIONS APTITUDE:30 QUESTIONS THERE IS NO NEGATIVE MARKING


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Questions and Answers
  • 1. 
    If the energy gap of semiconductor is 1.1 eV, then it would be
    • A. 

      Opaque to the visible light

    • B. 

      Transparent to the visible light

    • C. 

      Transparent to the ultraviolet radiation

    • D. 

      Opaque to the infrared radiation

  • 2. 
    With increasing temperature, the electrical conductivity would
    • A. 

      Increase in metals as well as in intrinsic semiconductors

    • B. 

      Increase in metals but decrease in intrinsic semiconductors

    • C. 

      Decrease in metals but increase in intrinsic semiconductors

    • D. 

      Decrease in metals as well as in intrinsic semiconductors

  • 3. 
    Energy Gap in Semi conductor's is
    • A. 

      Transparent to shorter Wavelengths and Opaque to Larger wavelengths

    • B. 

      Transparent to Longer Wavelengths and Opaque to Shorter Wavelengths

    • C. 

      Transparent to both Longer wave and Shorter wave lengths

    • D. 

      Opaque to both Longer wave and Shorter wave lengths

  • 4. 
    Conductivity Of Intrinsic semi conductors depend up on
    • A. 

      Temperature

    • B. 

      Band Gap

    • C. 

      Both a and b

    • D. 

      None of these

  • 5. 
    Loading effect is primarily caused by instruments having
    • A. 

      High resistance

    • B. 

      High sensitivity

    • C. 

      Low sensitivity

    • D. 

      High range

  • 6. 
    A 3½ digit voltmeter having a resolution of 100 mV can be used to measure maximum voltage of
    • A. 

      100V

    • B. 

      200V

    • C. 

      1000V

    • D. 

      5000V

  • 7. 
    Match List I (Bridges) with List II (Parameters) and select the correct answer: List I A. Anderson bridge B. Kelvin Bridge C. Schering Bridge D. Wheal stone Bridge List II 1. Low Resistance 2. Medium Resistance 3. Inductance 4. Capacitance A B C D
    • A. 

      4 2 3 1

    • B. 

      3 2 4 1

    • C. 

      3 1 4 2

    • D. 

      4 1 3 2

  • 8. 
    Load cell employ
    • A. 

      Piezoelectric crystal

    • B. 

      Capacitor

    • C. 

      Mutual inductance

    • D. 

      Strain gauges

  • 9. 
    Match List I (Devices) with list II (Characteristics) and select the correct answer: List I A. BJT B. MOSFET C. Tunnel diode D. Zener diode List II 1. Voltage controlled negative resistance 2. High current gain 3. Voltage regulation 4. High input impedance A  B  C  D
    • A. 

      1 4 2 3

    • B. 

      2 4 1 3

    • C. 

      2 3 1 4

    • D. 

      1 3 2 4

  • 10. 
    To avoid thermal runway in the design of an analog circuit, the operating point of the BJT should be such that it satisfies the condition
    • A. 

      I V VCE = 1/2 VCC

    • B. 

      VCE

    • C. 

      VCE > 1/2VCC

    • D. 

      VCE

  • 11. 
    Consider the following devices: 1. BJT in CB mode 2. BJT in CE mode 3. JFET 4. MOSFET The correct sequence of these devices in increasing order of their input impedance is
    • A. 

      1,2,3,4

    • B. 

      2,1,3,4

    • C. 

      2,1,4,3

    • D. 

      1,3,2,4

  • 12. 
    Consider the following statements for a 2- port network: 1. Z11 = Z22 2. h 12 = h 21 3. Y12= - Y21 4. BC-AD = - 1 The network is reciprocal if and only if
    • A. 

      1 and 2 are correct

    • B. 

      2 and 3 are correct

    • C. 

      3 and 4 are correct

    • D. 

      4 alone is correct

  • 13. 
    On closing switch ‘S’ the circuit in the given figure is in steady-state. The current in the inductor after opening the switch ‘S’ will
    • A. 

      Decay exponentially with a time constant of 2 s constant of 2s

    • B. 

      Decay exponentially with a time constant of 0.5s

    • C. 

      Consist of two decaying exponential each with a time constant of O.5s

    • D. 

      Be oscillatory

  • 14. 
    Match List I with list II for the driving point impedance synthesis and select the correct answer: List (form) A. Cauer I B. Cauer II C. Foster I D. Foster II List II (Networks) 1. L in series aims and C in shunt arms of a ladder 2. C in series arms and L in shunt arms of a ladder 3. Series combination of L and C in parallel 4. Parallel combination of L and C in series A   B   C   D
    • A. 

      1 2 3 4

    • B. 

      1 2 4 3

    • C. 

      2 1 4 3

    • D. 

      2 1 3 4

  • 15. 
    Poles and zeros of a driving-point function of a network are simple and interlace on the jw axis. The network consists of elements
    • A. 

      R and C

    • B. 

      L and C

    • C. 

      R and L

    • D. 

      R, L and C

  • 16. 
    The discrete-time equation y(n + 1) + 0.5n y(n) = 0.5x (n + 1) is NOT attributable to a
    • A. 

      Memoryless system

    • B. 

      Time-varying system

    • C. 

      Linear system

    • D. 

      Causal system

  • 17. 
    The maximum power handling capacity of a resistor depends on
    • A. 

      Total surface area

    • B. 

      Resistance value

    • C. 

      Thermal capacity of the resistor

    • D. 

      Resistivity of the material used in the resistor

  • 18. 
    Match List I (Bridges) with List II (Quantities) and select the correct answer List I A. Maxwell’s bridge B. Wien bridge C. Hay’s bridge D. Schering bridge List II 1. Frequency 2. Inductance with value of Q < 10 3. Capacitance 4. Inductance with value of Q > 10 A   B   C   D
    • A. 

      2 1 4 3

    • B. 

      4 3 2 1

    • C. 

      4 1 2 3

    • D. 

      2 3 4 1

  • 19. 
    Gauge factor of a strain gauge is defined as the ratio of a per unit change in the
    • A. 

      Conductivity to the per unit change in applied force acting on the element

    • B. 

      Resistance to the per unit change in the length of the element

    • C. 

      Stress to the per unit change in strain of the element

    • D. 

      Current to the per unit change in the length of the element

  • 20. 
    For an AM wave, the maximum voltage was found to be 10 V and the minimum voltage was found to be 5 V. The modulation index of the wave would be
    • A. 

      Conductivity to the per unit change in applied force acting on the element 0.33

    • B. 

      Resistance to the per unit change in the length of the element 0.52

    • C. 

      0.40

    • D. 

      0.1

  • 21. 
    Hot wire anemometer is a device used to measure the
    • A. 

      Pressure in gases

    • B. 

      Liquid discharge

    • C. 

      Gas velocities

    • D. 

      Temperature

  • 22. 
    The FM telemetry as compared with AM telemetry requires a channel that is
    • A. 

      Equal to that of AM telemetry

    • B. 

      Smaller than what is required for AM telemetry

    • C. 

      100 times of that required for AM telemetry

    • D. 

      10 times of that required for AM telemetry

  • 23. 
    Digital measuring instruments use the following three types of A to D converters 1. Dual Slope Type 2. Counter Type 3. Flash Type The correct sequence for  these converters in decreasing order of their speed is
    • A. 

      3, 1, 2

    • B. 

      1, 2, 3

    • C. 

      2, 3, 1

    • D. 

      3, 2, 1

  • 24. 
    Consider the following statements regarding the advantages of Anderson bridge: 1. It is the modification of the Maxwell’s inductance-capacitance bridge. 2. For measuring the low Q of coils, it is superior to the Maxwell’s bridge. 3. It is simple compared to Maxwell’s bridge. 4. It can be used to determine mutual inductance also
    • A. 

      1, 2 and 3

    • B. 

      1, 2 and 4

    • C. 

      2 and 4

    • D. 

      1, 3 and 4

  • 25. 
    The output current versus input voltage transfer characteristic of an n-channel JFET is such that there is
    • A. 

      Zero current flow at zero input voltage bias

    • B. 

      Current flow only when a positive input threshold voltage is crossed

    • C. 

      Current flow only when a negative input cut-off voltage bias is crossed

    • D. 

      No cut-off input voltage

  • 26. 
    Assertion (A): A circuit containing reactances is said to be in resonance if the voltage across the circuit is in phase with the current through it. Reason (R): At resonance, the power factor of the circuit is zero.
    • A. 

      Both A and R are true and R is the correct explanation of A

    • B. 

      Both A and R are true but R is NOT the correct explanation of A

    • C. 

      A is true but R is false

    • D. 

      A is false but R is true

  • 27. 
    The pole-zero patterns shown in the given figure is for
    • A. 

      A low - pass filter

    • B. 

      A high-pass filter

    • C. 

      An all - pass filter

    • D. 

      A band - pass filter

  • 28. 
    An op-amp has open-loop gain 100000 and the open- loop upper cut-off frequency is 20 Hz. The unity-gain frequency of the op-amp is
    • A. 

      2 MHz

    • B. 

      1 MHz

    • C. 

      3 kHz

    • D. 

      2 kHz

  • 29. 
    (Measured Quantities) and select the correct answer List I A. Capacitive transducer B. Thermocouple C. Load cell D. Diaphragm List II 1. Pressure 2. Torque 3. Displacement 4. Temperature A B C D
    • A. 

      2 4 3 1

    • B. 

      3 1 2 4

    • C. 

      2 1 3 4

    • D. 

      3 4 2 1

  • 30. 
    The piezoelectric crystal voltage sensitivity is defined as a
    • A. 

      Voltage developed per unit stress

    • B. 

      Field developed per unit stress

    • C. 

      Voltage developed per unit force

    • D. 

      Field developed per unit force

  • 31. 
    • A. 

      Causal, linear and time-varying

    • B. 

      Causal, non-linear and time-varying

    • C. 

      Non-causal, linear and time-varying

    • D. 

      Non-causal, non-linear and time-variant