Discussion
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- Question
If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. 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
- 2. 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
- 3. Which of the following is correct for a BJT?
Options- A.
- B.
- C.
- D.
Discuss
- 4. 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
- 5. In disc mounting of SCR
Options- A. SCR is clamped on one side of disc shaped heat sink
- B. SCR is clamped between two disc shaped heat sinks
- C. The SCR has low current rating
- D. None of the above Discuss
- 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
- 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
- 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
- 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
- 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
Power Electronics problems
Search Results
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: all of the above
Correct Answer:
Correct Answer: a Schottky diode has lower cut in voltage and higher reverse saturation current
Correct Answer: SCR is clamped between two disc shaped heat sinks
Correct Answer: two fully controlled converters connected in antiparallel
Correct Answer: is always positive
Correct Answer: 120°
Correct Answer: the durations of currents in all thyristors may or may not be equal
Correct Answer: the waveshapes of output voltage is square but the waveshape of load current is nearly sinusoidal
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