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Power Semiconductor Devices – 1 – 6

26. The UJT may be used as ……………………

(a) an amplifier
(b) a sawtooth generator
(c) a rectifier
(d) none of the above

ANSWER

EXPLANATION

27. A diac is simply ……………………

(a) a single junction device
(b) a three junction device
(c) a triac without gate terminal
(d) none of the above

ANSWER

EXPLANATION

28. After peak point, the UJT operates in the …………………… region.

(a) cut-off
(b) saturation
(c) negative resistance
(d) none of the above

ANSWER

EXPLANATION

29. Which of the following is not a characteristic of UJT ?

(a) intrinsic stand off ratio
(b) negative resistance
(c) peak-point voltage
(d) bilateral conduction

ANSWER

EXPLANATION

30. The triac is ……………………

(a) like a bidirectional SCR
(b) a four-terminal device
(c) not a thyristor
(d) answers (a) and (b)

ANSWER

EXPLANATION

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