Discussion
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- Question
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.
- Correct Answer
-
- 1. 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
- 2. A load commutated chopper circuit has
Options- A. one thyristor
- B. two thyristors
- C. four thyristors
- D. six thyristors Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. A 3 phase fully controlled converter is a
Options- A. 3 pulse converter
- B. 6 pulse converter
- C. 2 pulse converter
- D. 12 pulse converter Discuss
- 10. When a thyristor is conducting, the voltage drop across it is about
Options- A. 1 V
- B. 10 V
- C. 100 V
- D. 0.1 V Discuss
Power Electronics problems
Search Results
Correct Answer: 2 Vm
Correct Answer: four thyristors
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: rating about 1 A or less
Correct Answer: by applying either positive or negative signal to gate
Correct Answer: six times output frequency
Correct Answer: 6 pulse converter
Correct Answer: 1 V
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