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  • Question

  • Assertion (A): Gate triggering is the most commonly used method for triggering of an SCR.

    Reason (R): Even a small gate current is sufficient to turn on an SCR.


  • 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

  • Correct Answer
  • Both A and R are correct and R is correct explanation of A 

    • Power Electronics problems

    Search Results

    • 1. In an n stage high frequency series inverter having a time period T, each stage is active for a time interval of

    • Options
    • A. T
    • B.
    • C.
    • D.
      • Discuss
    • 2. McMurrary full bridge inverter uses

    • Options
    • A. auxiliary commutation
    • B. complementary commutation
    • C. natural commutation
    • D. any of the above
      • Discuss
    • 3. In a semi converter feeding a resistive load

    • Options
    • A. the waveshapes of output voltage and output current are exactly similar
    • B. the waveshapes of output voltage and output current can not be similar
    • C. the waveshapes of output voltage and output current are similar only for low values of firing angle
    • D. the waveshapes of output voltage and output current may be similar or dissimilar
      • Discuss
    • 4. A static excitation system uses

    • Options
    • A. transformer and thyristors
    • B. transformer and ac exciter
    • C. dc exciter and ac exciter
    • D. transformer and dc exciter
      • Discuss
    • 5. In a 3 phase semiconverter, the output voltage becomes discontinuous for

    • Options
    • A. firing angle > 30°
    • B. firing angle > 60°
    • C. firing angle > 90°
    • D. firing angle > 120°
      • Discuss
    • 6. In high frequency circuits impedance matching can be done by

      1. open circuited stubs
      2. short circuited stubs
      3. transformer
      Which of the above correct?

    • Options
    • A. 1, 2 and 3
    • B. 1 and 2 only
    • C. 1 and 3 only
    • D. 2 and 3 only
      • Discuss
    • 7. In a reflex klystron oscillator, repeller electrode is at

    • Options
    • A. low positive potential
    • B. high positive potential
    • C. negative potential
    • D. zero potential
      • Discuss
    • 8. Assertion (A): A backward wave oscillator can be used as a sweep generator.

      Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R are 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. Assertion (A): PIN diode is commonly used for microwave control.

      Reason (R): A PIN diode uses heavily doped p and n materials.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R are 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
    • 10. Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.

      Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R are 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

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