Power Electronics MCQ Questions and Answers
1. The basic elements of a electric drive is(are)-
Answer : C
2. Three phase converter are employed for :
Answer : A
3. A cycloconverter is :
Answer : C
4. Which method of heating control has leading power factor ?
Answer : B
5. When cells of storage battery are connected in parallel, then
Answer : A
Power Electronics MCQ
6. A Thyristor is a :
Answer : A
7. If the cathode of an SCR is made positive with respect to anode and no gate current is applied, then :
Answer : C
8. Which of the following is the most suitable method to “Turn ON” thyristor :
Answer : A
9. The sink to ambient thermal resistance of SCR
Answer : D
Explanation: It does not depend on any of the device configurations.
10. In a single-phase half-wave circuit with load RL and free-wheeling diode, the free-wheeling period is
Answer : C
Power Electronics MCQ
11. A fully controlled converter uses :
Answer : B
12. A three-phase full converter will require _______ number of SCRs
Answer : B
13. The cycloconverter requires forced or natural commutation as under :
Answer : A
14. A chopper is a :
Answer : D
Explanation: It is a high speed on/off semiconductor switch. Note that it behaves like a DC transformer, does not mean it is a DC transformer. There is no DC transformer.
15. In case of variable frequency system of chopper which is varied ?
Answer : A
Explanation: In frequency modulation scheme, the frequency (f) hence T (1/f) is varied by either keeping Ton constant or keeping Toff constant.
Power Electronics MCQ
16. Type-C chopper consists of :
Answer : A
17. Forced commutation requires :
Answer : A
18. The shape of the output voltage waveform in a single pulse width modulation is :
Answer : C
19. Single phase half bridge inverters requires-
Answer : D
20. In the series inverter control method :
Answer : C
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