Power Electronics problems
- 1. As compared to a p-n junction diode
Options- A. a schottky diode has lower cut in voltage and lower reverse saturation current
- B. a schottky diode has higher cut in voltage and higher reverse saturation current
- C. a Schottky diode has lower cut in voltage and higher reverse saturation current
- D. a schottky diode has higher cut in voltage and lower reverse saturation current Discuss
Correct Answer: a Schottky diode has lower cut in voltage and higher reverse saturation current
- 2. Which of the following is correct for a BJT?
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 3. 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
Correct Answer: all of the above
- 4. 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
Correct Answer: Both A and R correct but R is not correct explanation of A
- 5. If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 6. 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
Correct Answer: two fully controlled converters connected in antiparallel
- 7. 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 Discuss
Correct Answer: is always positive
- 8. 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
Correct Answer: 120°
- 9. 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
Correct Answer: the durations of currents in all thyristors may or may not be equal
- 10. 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
Correct Answer: the waveshapes of output voltage is square but the waveshape of load current is nearly sinusoidal
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