Discussion
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- Question
Which chopper circuit operates in quadrants 1 and 4?
Options- A. A
- B. B
- C. D
- D. E
- Correct Answer
- D
- 1. An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be
Options- A. 25 A
- B. 12.5 A
- C. less than 25 A
- D. less than 12.5 A Discuss
- 2. The output wave of a cycloconverter consists of a number of segments derived from the input wave.
Options- A. True
- B. False Discuss
- 3. The commutation method in an inverter, is
Options- A. line commutation
- B. forced commutation
- C. either (a) or (b)
- D. none of the above Discuss
- 4. The symbol in figure is for
Options- A. SUS
- B. SBS
- C. SCS
- D. Shockley diode Discuss
- 5. A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
Options- A. 0.5, 100 V and 1
- B. 0.25, 50 V and 3
- C. 0.25, 50 V and 1
- D. 0.5, 100 V and 3 Discuss
- 6. Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.
Reason (R): A semi converter is cheaper than a full converter.
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
- 7. In auxiliary commutated chopper, the peak value of thyristor current is
Options- A. equal to peak value of load current
- B. equal to peak value of capacitor current
- C. sum of peak value of load current and capacitor current
- D. none of the above Discuss
- 8. In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 9. A load commutated chopper circuit has
Options- A. one thyristor
- B. two thyristors
- C. four thyristors
- D. six thyristors Discuss
- 10. In a single phase full wave controlled rectifier using centre tap transformer, the voltage across each half of secondary is Vm sin ?t. The peak inverse voltage is
Options- A. 2 Vm
- B. Vm
- C. 0.5 Vm
- D. 0.25 Vm Discuss
Power Electronics problems
Search Results
Correct Answer: less than 12.5 A
Correct Answer: True
Correct Answer: either (a) or (b)
Correct Answer: SBS
Correct Answer: 0.25, 50 V and 3
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: sum of peak value of load current and capacitor current
Correct Answer: 4
Correct Answer: four thyristors
Correct Answer: 2 Vm
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