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  • Question

  • Which one of the following is transferred locking electron device C antenna?


  • Options
  • A. BARITT diode
  • B. IMPATT diode
  • C. Gunn diode
  • D. Step recovery diode

  • Correct Answer
  • Gunn diode 

    Explanation
    A Gunn diode uses GaAs which has a negative differential mobility, i.e., a decrease in carrier velocity with increase in electric field.

    This effects is called transferred electron effect. The impedance of a Gunn diode is tens of ohms.

    A Gunn diode oscillator has a resonant cavity, an arrangement to couple Gunn diode to cavity, biasing arrangement for Gunn diode and arrangement to couple RF power to load.

    Applications of Gunn diode oscillator include continuous wave radar, pulsed radar and microwave receivers.

    More questions

    • 1. The power dissipation in a transistor is the product of

    • Options
    • A. emitter current and emitter to base voltage
    • B. emitter current and collector to emitter voltage
    • C. collector current and collector to emitter voltage
    • D. none of the above
      • Discuss
    • 2. Match the following:

      List I (F.T and F.S) List II (Properties)
      A. Fourier Series 1. Discrete, Periodic
      B. Fourier Transform 2. Continuous, Periodic
      C. Discrete Time Fourier 3. Discrete aperiodic
      D. Discrete Fourier Transform 4. Continuous, aperiodic


    • Options
    • A. A-3, B-4, C-2, D-1
    • B. A-1, B-2, C-4, D-3
    • C. A-3, B-2, C-4, D-1
    • D. A-1, B-4, C-2, D-3
      • Discuss
    • 3. Consider the following statements

      1. An iron cored choke is non linear and passive device.
      2. A carbon resistor kept in sunlight is a time invariant and passive device.
      3. A dry cell is a time varying and active device.
      4. An air capacitor is time invariant and passive device.
      Of these statements

    • Options
    • A. 1, 2, 3 and 4 are correct
    • B. 1, 2, 3 are correct
    • C. 1, 2, 4 are correct
    • D. 2 and 4 are correct
      • Discuss
    • 4. Mc Murray full bridge inverter uses

    • Options
    • A. 4 thyristors and 2 diodes
    • B. 4 thyristors and 4 diodes
    • C. 8 thyristors and 4 diodes
    • D. 8 thyristors and 8 diodes
      • Discuss
    • 5. Loss of charge method is suitable for medium resistances.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. If is the Laplace transform of f(t) then f(0+) is

    • Options
    • A. 0
    • B.
    • C. 27
    • D. ?
      • Discuss
    • 7. Match the following:

      List I List II
      A. Ampere's Law 1.
      B. Faraday's Law 2.
      C. Gauss's Law 3.
      D. Free Space 4.


    • Options
    • A. A-1, B-4, C-2, D-3
    • B. A-2, B-4, C-3, D-1
    • C. A-3, B-1, C-2, D-4
    • D. A-4, B-3, C-2, D-1
      • Discuss
    • 8. Assertion (A): Light triggering is very suitable for HVDC transmission.

      Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
      • Discuss
    • 9. Most electromagnetic transmission in rectangular wave-guide uses

    • Options
    • A. TE10 mode
    • B. TE01 mode
    • C. TE20 mode
    • D. TE11 mode
      • Discuss
    • 10. The amount of photoelectric emission current depends on

    • Options
    • A. frequency of incident radiation
    • B. intensity of incident radiation
    • C. both frequency and intensity of incident radiation
    • D. none of the above
      • Discuss

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