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  • Question

  • In a single phase half wave ac regulator feeding a resistive load, the rms load current


  • Options
  • A. is always positive
  • B. may be positive or negative
  • C. is always negative
  • D. can be even zero

  • Correct Answer
  • is always positive 

    • Power Electronics problems

    Search Results

    • 1. A single phase dual converter consists of

    • Options
    • A. two fully controlled converters connected in parallel
    • B. two fully controlled converters connected in antiparallel
    • C. two fully controlled semiconverters connected in antiparallel
    • D. two fully controlled semiconverters connected in parallel
      • Discuss
    • 2. If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. Assertion (A): A class C chopper can operate in first and second quadrants

      Reason (R): A class B chopper operates only in second quadrant.


    • 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
    • 4. Thyristors can be used for control of

    • Options
    • A. dc separately excited motor
    • B. dc shunt motor
    • C. dc series motor
    • D. all of the above
      • Discuss
    • 5. Which of the following is correct for a BJT?

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of

    • Options
    • A. 120°
    • B. 60°
    • C. 240°
    • D. any of the above
      • Discuss
    • 7. In a single phase cycloconverter with centre tapped transformer

    • Options
    • A. all thyristors carry currents for equal duration
    • B. the durations of currents in all thyristors may or may not be equal
    • C. the durations of currents in all thyristors cannot be equal
    • D. the duration of currents in all thyristors must be equal for satisfactory operation
      • Discuss
    • 8. In a full bridge circuit supplying an RLC under damped circuit

    • Options
    • A. the waveshapes of output voltage and load current are square
    • B. the waveshapes of output voltage and load current are sinusoidal
    • C. the waveshapes of output voltage is square but the waveshape of load current is nearly sinusoidal
    • D. none of the above
      • Discuss
    • 9. The method of triggering SCS is

    • Options
    • A. application of positive pulse at cathode gate or negative pulse at anode gate
    • B. application of pulse at anode gate
    • C. application of pulse at cathode gate
    • D. application of low voltage at anode
      • Discuss
    • 10. A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ?t. The KVL equation to find firing angle a is

    • Options
    • A. cos a = E + I0R
    • B. cos a = E + I0R
    • C. cos a = E - I0R
    • D. cos a = E - I0R
      • Discuss

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