Power Semiconductor Devices and Their Applications MCQs

Question 1

The triac is

Accepted Answer

like a bidirectional SCR

Answer

a four-terminal device

Answer

not a thyristor

Answer

answer (i) and (ii)

Question 2

Which of the following device incorporates a terminal for synchronising purposes?

Accepted Answer

SUS

Answer

Disc

Answer

Triac

Answer

none of the above

Question 3

The advantage of thyristor over SCS is

Accepted Answer

faster switching time and smaller VH

Answer

slow switching time and large Vu

Answer

slow switching time and smaller VH

Answer

faster switching time and large VH.

Question 4

A thyristor equivalent of a thyratron tube is a

Accepted Answer

silicon controlled-rectifier SCR

Answer

disc

Answer

triac

Answer

done of the above

Question 5

A triac a

Accepted Answer

3 terminal unilateral switch

Answer

2 terminal switch

Answer

2 terminal bilateral switch

Answer

3 terminal bidirectional switch

Question 6

The tripple frequency of a six phase half wave rectifier for 220 V, 60 Hz input will be

Accepted Answer

360 Hz

Answer

2160 Hz

Answer

720 Hz

Answer

60 Hz

Question 7

The minimum duration of pulse in a pulse triggering system for thyristors should be at least

Accepted Answer

10 us

Answer

10 ms

Answer

30 ms

Answer

1 sec

Question 8

As compared to oscillators, an inverter provides

Accepted Answer

low frequency output

Answer

low voltage output

Answer

distortion less output

Answer

noiseless output

Question 9

During induction heating, the skin depth of penetration is proportional (f= frequency) to

Accepted Answer

none of the above

Answer

f

Answer

f2

Answer

f3