Discussion
Home ‣ Electronics and Communication Engineering ‣ Power Electronics Comments
- Question
The symbol in figure is for
Options- A. SUS
- B. SBS
- C. SCS
- D. Shockley diode
- Correct Answer
- SBS
- 1. 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
- 2. 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.
Discuss
- 3. 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
- 4. In a single phase semi-converter the number of thyristors is
Options- A. 16
- B. 8
- C. 4
- D. 2 Discuss
- 5. 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
- 6. 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
- 7. The output wave of a cycloconverter consists of a number of segments derived from the input wave.
Options- A. True
- B. False Discuss
- 8. 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
- 9. Which chopper circuit operates in quadrants 1 and 4?
Options- A. A
- B. B
- C. D
- D. E Discuss
- 10. Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.
Reason (R): A semi converter is cheaper than a full converter.
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
Power Electronics problems
Search Results
Correct Answer: 0.25, 50 V and 3
Correct Answer: 2 Ir
Correct Answer: 3
Correct Answer: 2
Correct Answer: will be more than 100 N-m
Correct Answer: either (a) or (b)
Correct Answer: True
Correct Answer: less than 12.5 A
Correct Answer: D
Correct Answer: Both A and R correct but R is not correct explanation of A
Comments
There are no comments.More in Electronics and Communication Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.