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  • Question

  • 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

  • Correct Answer
  • transformer and thyristors 

    • Power Electronics problems

    Search Results

    • 1. 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
    • 2. A single phase fully controlled bridge converter is feeding an RLE load. Input voltage is Vm sin ?t and firing angle is a. If average current is I0, then

    • Options
    • A. cos a = RI0 + E
    • B. cos a = RE0 + E
    • C. cos a = E0 - RI0
    • D. cos a = E - RI0
      • Discuss
    • 3. In integral cycle control of ac regulator, the input power factor is equal to

    • Options
    • A. duty cycle a
    • B. a2
    • C. a
    • D. (a)1/3
      • Discuss
    • 4. Ripple factor RF and form factor FF are related as

    • Options
    • A. RF = FF2 - 1
    • B. RF = (FF2 - 1)0.5
    • C. RF = FF - 1
    • D. RF = (FF - 1)0.5
      • Discuss
    • 5. The application of gate signal decreases the break over voltage of on SCR.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. 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
    • 7. McMurrary full bridge inverter uses

    • Options
    • A. auxiliary commutation
    • B. complementary commutation
    • C. natural commutation
    • D. any of the above
      • Discuss
    • 8. 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
    • 9. 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
      • Discuss
    • 10. 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

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