Power Semiconductor Devices – 1 – 3

11. A UJT has ……………………

(a) two pnjunctions
(b) one pnjunction
(c) three pnjunctions
(d) none of the above

ANSWER

EXPLANATION

12. The normal way to turn on a diac is by …………

(a) gate current
(b) gate voltage
(c) breakover voltage
(d) none of the above

ANSWER

EXPLANATION

13. A diac is ………… switch.

(a) an a.c.
(b) a d.c.
(c) a mechanical
(d) none of the above

ANSWER

EXPLANATION

14. In a UJT,the p-type emitter is ………… doped.

(a) lightly
(b) heavily
(c) moderately
(d) none of the above

ANSWER

EXPLANATION

15. Power electronics essentially deals with control of a.c. power at …………

(a) frequencies above 20 kHz
(b) frequencies above 1000 kHz
(c) frequencies less than 10 Hz
(d) 50 Hz frequency

ANSWER

EXPLANATION

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