Power Electronics problems
- 1. Inverters find applications in
Options- A. HVDC transmission
- B. UPS
- C. variable speed ac drives
- D. all of the above Discuss
Correct Answer: all of the above
- 2. It is possible to use a freewheeling diode in
Options- A. single phase half wave controlled rectifier as well as in single phase full wave controlled rectifier (M - 2 connection)
- B. single phase half wave controlled rectifier but not in single phase full wave controlled rectifier (M - 2 connection)
- C. single phase full wave controlled rectifier (M - 2 connection) but not in single phase half wave controlled rectifier
- D. all controlled rectifier circuits Discuss
Correct Answer: all controlled rectifier circuits
- 3. The leads in a TRIAC are denoted by
Options- A. anode cathode, gate
- B. T1 T2, gate
- C. T1, T2, anode
- D. T1, T2, T3 Discuss
Correct Answer: T1 T2, gate
- 4. Assertion (A): A GTO can be turned on and turned off by gate pulses
Reason (R): A GTO can be turned off by negative gate pulse.
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. As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. Assertion (A): When the anode current of an SCR starts increasing during turn on process, the anode cathode voltage drop starts decreasing.
Reason (R): During turn on the reverse biased junction in SCR breaksdown.
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 are correct and R is correct explanation of A
- 7. When a thyristor is conducting, the voltage drop across it
Options- A. is absolutely constant
- B. decreases with increase in load current
- C. increases slightly with increase in load current
- D. none of the above Discuss
Correct Answer: increases slightly with increase in load current
- 8. The static equalisation circuit for thyristors connected in series is
Options- A. one resistor in series with each thyristor
- B. one resistor in parallel with each thyristor
- C. one resistor and one capacitor in parallel with each thyristor
- D. none of the above Discuss
Correct Answer: one resistor in parallel with each thyristor
- 9. The advantage of modified series inverter with two inductors and two capacitors is
Options- A. the intermittent operation of battery is avoided
- B. efficiency of circuit is more
- C. the output frequency is low
- D. all of the above Discuss
Correct Answer: the intermittent operation of battery is avoided
- 10. A fully controlled bridge converter can operate in quadrants
Options- A. 1
- B. 1 and 2
- C. 1 and 3
- D. 1 and 4 Discuss
Correct Answer: 1 and 4
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