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- Question
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
- Correct Answer
- one resistor in parallel with each thyristor
- 1. 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
- 2. 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
- 3. As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.
Options- A. True
- B. False Discuss
- 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
- 5. 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
- 6. 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
- 7. 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
- 8. A TRIAC is equivalent to
Options- A. two thyristors in series
- B. two thyristors in parallel
- C. one thyristor and one diode
- D. one thyristor and one transistor Discuss
- 9. Assertion (A): The output voltage of an inverter can be controlled by PWM technique
Reason (R): In a current source inverter the input current is constant.
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
- 10. An SUS is
Options- A. exactly similar to SCR but with higher rating
- B. similar to UJT
- C. PUT and avalanche diode connected in anti parallel
- D. SCR and avalanche diode connected in parallel Discuss
Power Electronics problems
Search Results
Correct Answer: increases slightly with increase in load current
Correct Answer: Both A and R are correct and R is correct explanation of A
Correct Answer: True
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: T1 T2, gate
Correct Answer: the intermittent operation of battery is avoided
Correct Answer: 1 and 4
Correct Answer: two thyristors in parallel
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: PUT and avalanche diode connected in anti parallel
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