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  • Question

  • The number of leads in a DIAC are


  • Options
  • A. 2
  • B. 3
  • C. 4
  • D. 6

  • Correct Answer
  • 2 

    • Power Electronics problems

    Search Results

    • 1. In a modified series inverter with two inductors and two capacitors, the load current

    • Options
    • A. has 2 parallel paths
    • B. has only one parallel path
    • C. can have three parallel paths
    • D. has four parallel paths
      • Discuss
    • 2. In a bridge inverter

    • Options
    • A. an output transformer is essential
    • B. an output transformer is not essential
    • C. an output transformer cannot be connected
    • D. an output transformer, if used, can improve the efficiency of the circuit
      • Discuss
    • 3. A single phase fully controlled bridge converter is fed by a voltage Vm sin ?t. The average and rms values of output voltage are

    • Options
    • A.
    • B.
    • C. cos a and Vm
    • D. cos a and 2 Vm
      • Discuss
    • 4. A crowbar circuit is generally needed for protection under fault conditions.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A single phase semiconverter is feeding a highly inductive load and has a freewheeling diode across the load. The waveshape of input current is

    • Options
    • A. sinusoidal
    • B. rectangular
    • C. sinusoidal or rectangular
    • D. triangular
      • Discuss
    • 6. An ideal rectifier should have

    • Options
    • A. 100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor
    • B. 100% efficiency, zero tipple factor, zero harmonic factor and zero displacement factor
    • C. 100% efficiency, zero ripple factor, unity harmonic factor and unity displacement factor
    • D. 100% efficiency, unity ripple factor, zero harmonic factor and unity displacement factor
      • Discuss
    • 7. To turn off an SCR, it is necessary to reduce its current to less than :

    • Options
    • A. trigger current
    • B. holding current
    • C. breakover current
    • D. none of the above
      • Discuss
    • 8. Assertion (A): The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fired.

      Reason (R): A thyristor can conduct only when it is forward biased.


    • 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. The effect of source inductance in a 3 phase fully controlled bridge converter is to

    • Options
    • A. decrease the output voltage
    • B. increase the output voltage
    • C. decrease the output voltage and increase the output current
    • D. increase the output voltage and decrease the output current
      • Discuss
    • 10. Class A and class B chopper

    • Options
    • A. operate in first quadrant
    • B. operate in second quadrant
    • C. class A chopper operates in first quadrant while class B operates in second quadrant
    • D. may operate in either first or second quadrant
      • Discuss

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