Top 250+ Solved Power Electronics MCQ Questions Answer

a. resonant commutation

b. self commutation

c. load commutation

d. auxiliary commutation

a. 2 thyristors

b. 4 thyristors

c. 2 thyristors and two diodes

d. 4 thyristors and 4 diodes

a. 16

b. 8

c. 4

d. 2

a. Class A

b. Class B

c. Class C

d. Class D

a. both these methods are based on entirely different principles

b. in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current

c. resonant commutation uses L and C but self commutation uses only capacitor

d. none of the above

a. the commutating elements carry full load current

b. the commutating elements carry upto 50% of load current

c. the commutating elements do not carry load current

d. any of the above

a. UJT

b. SCR

c. DIAC

d. TRIAC

a. will have equal on state voltage drops

b. will have equal forward blocking voltage for the same current

c. will have different on state voltage drops

d. may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current

a. 4 thyristors

b. 4 thyristors and 4 diodes

c. 4 thyristors and 2 diodes

d. 8 thyristors

a. low harmonic content

b. high harmonic content

c. low or high harmonic content depending on firing angle

d. zero harmonic content

a. True

b. False

c. none

d. all

a. less than Ip

b. more than Iv

c. more than Ip but less than Iv

d. negative

a. is always zero

b. cannot be zero

c. may be sometimes zero

d. is always positive

a. UJT

b. SCR

c. TRIAC

d. SCR and TRIAC

a. sine wave

b. square wave

c. saw tooth wave

d. either (a) or (c)