Explore topic-wise MCQs in Power Electronics.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics knowledge and support exam preparation. Choose a topic below to get started.

1.

The peak value of the line voltage in case of 120° mode of operation of a three-phase bridge inverter is

A. Vs/2
B. 3Vs/2
C. Vs/√2
D. Vs
Answer» E.
Discussion
2.

Find the line voltage VYR when only T3 and T4 are conducting? Consider a star connected balanced R load.

A. 2Vs/3
B. Vs/2
C. Vs
D. –Vs
Answer» D. –Vs
Discussion
3.

If the SCR T1 is gated at 0°, then for 120° mode of operation, from ωt = 240° to 300° __________ devices would conduct.

A. T3, T4
B. T4, T5
C. T1, T6
D. T5, T6
Answer» C. T1, T6
Discussion
4.

What is the R phase voltage and Y phase voltage when only T3 and T4 are conducting? Consider a star connected balanced R load.

A. Vs, -Vs
B. Vs/2, -Vs/2
C. –Vs/2, Vs/2
D. –Vs, Vs
Answer» D. –Vs, Vs
Discussion
5.

What is the B phase voltage when only T1 and T2 are conducting from 60° to 120°. Consider star connected R load.

A. Vs
B. Vs/2
C. –Vs/2
D. 0
Answer» D. 0
Discussion
6.

If T1 is gated at 0 °, T3 and T5 will start conducting at _______ and _________ respectively.

A. 180°, 270°
B. 120°, 240°
C. 180°, 300°
D. 240°, 360°
Answer» C. 180°, 300°
Discussion
7.

What is the R phase voltage when only T1 and T2 are conducting from 60° to 120°. Consider star connected R load.

A. Vs
B. Vs/2
C. –Vs/2
D. 0
Answer» C. –Vs/2
Discussion
8.

Safe commutation can be achieved in case of the ____________ operating mode.

A. 180°
B. 120°
C. 360°
D. none of the mentioned
Answer» C. 360°
Discussion
9.

In case of the 120° mode of operation, __________ devices conduct at a time.

A. 2
B. 3
C. 4
D. none of the mentioned
Answer» B. 3
Discussion
10.

The 120° mode of operation of a three phase bridge inverter requires ___________ number of steps.

A. 2
B. 4
C. 6
D. 8
Answer» D. 8
Discussion