Discussion
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- Question
The symbol in figure is for
Options- A. UJT
- B. PUT
- C. SCS
- D. SBS
- Correct Answer
- PUT
- 1. In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is a. Each thyristor conducts for a period
Options- A. p
- B. a
- C. p - a
- D.
Discuss
- 2. A 3 phase series inverter has
Options- A. 12 thyristors
- B. 6 thyristors
- C. 3 thyristors
- D. 3 or 6 thyristors Discuss
- 3. A half bridge inverter
Options- A. needs a 3 wire dc supply
- B. may use a two wire or 3 wire dc supply
- C. has higher output voltage if fed from 3 wire dc supply
- D. has higher efficiency if fed from 3 wire dc supply Discuss
- 4. In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is
Options- A. 150 A
- B. 75 A
- C. 50 A
- D. 300 A Discuss
- 5. Multiphase choppers are used in
Options- A. low power circuits
- B. high power circuit
- C. both low and high power circuits
- D. medium power circuits Discuss
- 6. In a single phase half wave converter feeding resistive load and full wave converter (M - 2 connection) feeding a resistive load the circuit conditions are similar. The firing angle is a. Then the waveshapes of voltages across thyristors
Options- A. are similar
- B. are not similar
- C. may be similar or dissimilar
- D. are similar only for some values of a Discuss
- 7. HVDC systems are preferable for only long distances.
Options- A. True
- B. False Discuss
- 8. A single phase half bridge inverter required to feed R-L loads needs
Options- A. 2 thyristors
- B. 4 thyristors
- C. 2 thyristors and two diodes
- D. 4 thyristors and 4 diodes Discuss
- 9. When a dc chopper feeds an RLE load, the load current, during steady state operation
Options- A. remains constant
- B. varies between maximum and minimum values
- C. may remain constant or vary
- D. is constant if R is constant Discuss
- 10. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
Options- A. must be isolated
- B. may or may not be isolated
- C. should be preferably, isolated
- D. should not be isolated Discuss
Power Electronics problems
Search Results
Correct Answer: p
Correct Answer: 6 thyristors
Correct Answer: needs a 3 wire dc supply
Correct Answer: 150 A
Correct Answer: high power circuit
Correct Answer: are similar
Correct Answer: True
Correct Answer: 2 thyristors and two diodes
Correct Answer: varies between maximum and minimum values
Correct Answer: must be isolated
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