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.

What is the voltage between the B phase and the neutral, when T2, T3 and T4 are conducting?

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

What is the Y phase voltage, when T2, T3 and T4 are conducting?

A. 0
B. Vs/3
C. 2Vs/3
D. -Vs/3
Answer» D. -Vs/3
Discussion
3.

Find VRY, when T6, T1 and T2 are conducting. Consider a star connected R load.

A. Vs
B. Vs/3
C. 0
D. 2Vs/3
Answer» B. Vs/3
Discussion
4.

Find VYB, when T6, T1 and T2 are conducting. Consider a star connected R load.

A. Vs
B. Vs/3
C. 0
D. 2Vs/3
Answer» D. 2Vs/3
Discussion
5.

What is the maximum line voltage value in case of a three-phase VSI in 180° mode?

A. 2Vs
B. Vs
C. 3Vs
D. 2Vs/3
Answer» C. 3Vs
Discussion
6.

What are the phase voltages when T1, T2 and T3 are conducting? Consider a star connected R load.

A. VYN = VBN = VRN = 0
B. VYN = VRN = Vs/3, VBN = – 2Vs/3
C. VRN = VBN = – Vs/3, VYN = 2Vs/3
D. VYN = VBN = Vs/3, VRN = – 2Vs/3
Answer» C. VRN = VBN = – Vs/3, VYN = 2Vs/3
Discussion
7.

What are the phase voltages when T6, T1 and T2 are conducting? Consider a star connected R load.

A. VYN = VBN = Vs/3, VRN = 0
B. VYN = VRN = – Vs/3, VBN = 2Vs/3
C. VRN = VBN = – Vs/3, VYN = 2Vs/3
D. VYN = VBN = – Vs/3, VRN = 2Vs/3
Answer» D. VYN = VBN = – Vs/3, VRN = 2Vs/3
Discussion
8.

What is the R phase voltage when T1, T6 and T5 are conducting? Consider a star connected R load.

A. Vs
B. 2Vs/3
C. Vs/3
D. –Vs/3
Answer» D. –Vs/3
Discussion
9.

What is the peak value of phase voltage in case of 3-phase VSI with 180° mode. The supply side consists of a constant dc voltage source of Vs.

A. Vs
B. 3Vs/2
C. 2Vs/3
D. 3Vs
Answer» D. 3Vs
Discussion
10.

The conducting SCRs from 180 to 240 degrees would be

A. 6, 1, 2
B. 2, 3, 4
C. 3, 4, 5
D. 5, 6, 1
Answer» C. 3, 4, 5
Discussion