Discussion
Home ‣ Electronics and Communication Engineering ‣ Power Electronics Comments
- Question
A relaxation oscillator uses
Options- A. tunnel diode
- B. UJT
- C. both tunnel diode and UJT
- D. PIN diode
- Correct Answer
- UJT
- 1. 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
- 2. 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
- 3. A single phase full converter can operate in
Options- A. 4 quadrants
- B. 3 quadrants
- C. 2 quadrants
- D. 1 quadrant Discuss
- 4. A single phase bridge type cycloconverter uses eight thyristors.
Options- A. True
- B. False Discuss
- 5. Thyristors connected in series need :
Options- A. static equalizing circuit
- B. dynamic equalizing circuit
- C. both static and dynamic equalizing circuits
- D. none of the above Discuss
- 6. 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
- 7. A current source inverter has simple commutation circuit.
Options- A. True
- B. False Discuss
- 8. 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
- 9. 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
- 10. 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
Power Electronics problems
Search Results
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: True
Correct Answer: both static and dynamic equalizing circuits
Correct Answer: is more than 60°
Correct Answer: True
Correct Answer: relative values of load parameters R, L and C
Correct Answer: only in positive half cycle
Correct Answer:
Comments
There are no comments.More in Electronics and Communication Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.