Discussion
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- Question
In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to
Options- A. 2Ir
- B. 2 Ir
- C. Ir
- D.
- Correct Answer
- 2 Ir
- 1. A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are
Options- A. 1
- B. 2
- C. 3
- D. 3 or 4 Discuss
- 2. In a single phase semi-converter the number of thyristors is
Options- A. 16
- B. 8
- C. 4
- D. 2 Discuss
- 3. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
Options- A. will be less than 100 N-m
- B. will be more than 100 N-m
- C. may be more or less than 100 N-m depending on motor parameters
- D. very small Discuss
- 4. A UJT exhibits negative resistance characteristics when
Options- A. Current is less than valley current
- B. Current is less than peak current
- C. Current is more than peak current but less than valley current
- D. None of the above Discuss
- 5. In a single phase full wave regulator feeding a resistive load, the average current over one full cycle
Options- A. is always zero
- B. cannot be zero
- C. may be sometimes zero
- D. is always positive Discuss
- 6. A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
Options- A. 0.5, 100 V and 1
- B. 0.25, 50 V and 3
- C. 0.25, 50 V and 1
- D. 0.5, 100 V and 3 Discuss
- 7. The symbol in figure is for
Options- A. SUS
- B. SBS
- C. SCS
- D. Shockley diode Discuss
- 8. The commutation method in an inverter, is
Options- A. line commutation
- B. forced commutation
- C. either (a) or (b)
- D. none of the above Discuss
- 9. The output wave of a cycloconverter consists of a number of segments derived from the input wave.
Options- A. True
- B. False Discuss
- 10. An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be
Options- A. 25 A
- B. 12.5 A
- C. less than 25 A
- D. less than 12.5 A Discuss
Power Electronics problems
Search Results
Correct Answer: 3
Correct Answer: 2
Correct Answer: will be more than 100 N-m
Correct Answer: Current is more than peak current but less than valley current
Correct Answer: is always zero
Correct Answer: 0.25, 50 V and 3
Correct Answer: SBS
Correct Answer: either (a) or (b)
Correct Answer: True
Correct Answer: less than 12.5 A
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