Discussion
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- Question
The gate lead, in a thyristor is welded to :
Options- A. p layer to which anode is connected
- B. n layer nearest to the anode terminal
- C. p layer nearest to the cathode terminal
- D. outside n layer
- Correct Answer
- n layer nearest to the anode terminal
- 1. Natural commutation can be used in :
Options- A. DC circuits only
- B. AC circuits only
- C. both AC and DC circuits
- D. none of the above Discuss
- 2. Which of the following devices exhibit negative resistance characteristics?
Options- A. UJT
- B. PUT
- C. Both UJT and PUT
- D. UJT, PUT and SBS Discuss
- 3. A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is
Options- A. 15 V
- B. 152 V
- C. 30 V
- D. 302 V Discuss
- 4. A single phase cycloconverter feeds a resistance heating load. The heating power is provided by
Options- A. only the fundamental component of output wave
- B. only higher harmonics in the output wave
- C. both fundamental and higher harmonics in the output wave
- D. either (a) or (b) Discuss
- 5. In a thyristors are i = kva. The value of a is
Options- A. about 0.5
- B. about 2
- C. about 5
- D. about 20 Discuss
- 6. Which chopper circuit operates in all the 4 quadrants?
Options- A. A
- B. C
- C. D
- D. E Discuss
- 7. Which converter is used in HVDC transmission?
Options- A. 3 pulse
- B. 6 pulse
- C. 12 pulse
- D. 24 pulse Discuss
- 8. A chopper cannot be line commutated.
Options- A. True
- B. False Discuss
- 9. Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3° C/W
Reason (R): Heat sinks of thyristors are generally made of aluminium.
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. In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be
Options- A. less than mechanical or thermal time constant of the system
- B. more than the mechanical or thermal time constant of the system
- C. more or less than the mechanical or thermal time constant
- D. very high Discuss
Power Electronics problems
Search Results
Correct Answer: AC circuits only
Correct Answer: Both UJT and PUT
Correct Answer: 30 V
Correct Answer: both fundamental and higher harmonics in the output wave
Correct Answer: about 5
Correct Answer: E
Correct Answer: 12 pulse
Correct Answer: True
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: less than mechanical or thermal time constant of the system
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