Discussion
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- Question
A load commutated chopper circuit has
Options- A. one thyristor
- B. two thyristors
- C. four thyristors
- D. six thyristors
- Correct Answer
- four thyristors
- 1. 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
- 2. 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
- 3. 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
- 4. Which chopper circuit operates in quadrants 1 and 4?
Options- A. A
- B. B
- C. D
- D. E Discuss
- 5. 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
- 6. 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
- 7. If peak value of input voltage is Vm and firing angle is a, the average output voltage for single phase half wave and single phase full wave regulators are
Options- A.
- B.
- C.
- D.
Discuss
- 8. Lead mounting for SCR is used for
Options- A. rating less than mA
- B. rating about 1 A or less
- C. rating of 20 A or less than 20 A
- D. rating 100 A or less Discuss
- 9. A TRIAC can be turned on :
Options- A. by applying a positive signal to gate
- B. by applying a negative signal to gate
- C. by applying either positive or negative signal to gate
- D. none of the above Discuss
- 10. In a three phase series inverter, the firing frequency is
Options- A. three times output frequency
- B. six times output frequency
- C. twice the output frequency
- D. equal to output frequency Discuss
Power Electronics problems
Search Results
Correct Answer: 4
Correct Answer: sum of peak value of load current and capacitor current
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: D
Correct Answer: less than 12.5 A
Correct Answer: 2 Vm
Correct Answer:
Correct Answer: rating about 1 A or less
Correct Answer: by applying either positive or negative signal to gate
Correct Answer: six times output frequency
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