Discussion
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- Question
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
- Correct Answer
- T1 T2, gate
- 1. 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
- 2. Inverters find applications in
Options- A. HVDC transmission
- B. UPS
- C. variable speed ac drives
- D. all of the above Discuss
- 3. In a half bridge inverter, the freewheeling diodes are needed
Options- A. even when load is resistive
- B. only when load is inductive
- C. only when load is inductive or capacitive
- D. for all types of loads Discuss
- 4. The use of free wheeling diode in controlled rectifier improves the waveshape of load current.
Options- A. True
- B. False Discuss
- 5. 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
- 6. 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
- 7. As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.
Options- A. True
- B. False Discuss
- 8. 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
- 9. 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
- 10. 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
Power Electronics problems
Search Results
Correct Answer: all controlled rectifier circuits
Correct Answer: all of the above
Correct Answer: only when load is inductive or capacitive
Correct Answer: True
Correct Answer: 1 V
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: True
Correct Answer: Both A and R are correct and R is correct explanation of A
Correct Answer: increases slightly with increase in load current
Correct Answer: one resistor in parallel with each thyristor
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