Discussion
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- Question
A current source inverter has simple commutation circuit.
Options- A. True
- B. False
- Correct Answer
- True
- 1. In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle
Options- A. is zero
- B. is 60°
- C. is more than 60°
- D. is more than 90° Discuss
- 2. A relaxation oscillator uses
Options- A. tunnel diode
- B. UJT
- C. both tunnel diode and UJT
- D. PIN diode Discuss
- 3. A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then
Options- A. Pdc = Pac for all values of firing angles
- B. Pdc = Pac if firing angle is less than 180°
- C. Pdc < Pac for all values of firing angles
- D. Pdc < Pac if firing angle is less than 180° Discuss
- 4. In a thyristor, the forward breakover voltage
Options- A. is constant
- B. may be constant or may depend on gate current
- C. decreases as gate current is increased
- D. increases as gate current is increased Discuss
- 5. A single phase full converter can operate in
Options- A. 4 quadrants
- B. 3 quadrants
- C. 2 quadrants
- D. 1 quadrant Discuss
- 6. In a full bridge inverter, the waveshape of load current depends on
Options- A. relative values of load parameters R, L and C
- B. relative values of load parameters R and L
- C. relative values of load parameters L and C
- D. gating frequency Discuss
- 7. In the basic series inverter circuit, the source supplies load
Options- A. only in positive half cycle
- B. both in positive and negative half cycles
- C. only in part of positive half cycle
- D. in positive half cycle and part of negative half cycle Discuss
- 8. A 3 phase fully controlled bridge converter is fed by a 3 phase system having phase voltage v = Vm sin ?t. The firing angle is a. The dc output voltage is
Options- A.
- B.
- C.
- D.
Discuss
- 9. In an ordinary thyristor
Options- A. turn on and turn off times are equal
- B. turn on time is more than turn off time
- C. turn off time is more than turn on time
- D. turn on time may be equal, less than or more than turn off time Discuss
- 10. A voltage VBB is applied across the terminals of a UJT. The emitter voltage at peak point is
Options- A. hVBB
- B. (h + 1) VBB
- C. hVBB + VD
- D. VD Discuss
Power Electronics problems
Search Results
Correct Answer: is more than 60°
Correct Answer: UJT
Correct Answer: Pdc < Pac if firing angle is less than 180°
Correct Answer: decreases as gate current is increased
Correct Answer: 2 quadrants
Correct Answer: relative values of load parameters R, L and C
Correct Answer: only in positive half cycle
Correct Answer:
Correct Answer: turn off time is more than turn on time
Correct Answer: hVBB + VD
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