Explore topic-wise MCQs in Power Electronics.

This section includes 6 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.

___________ commutation technique is commonly employed in series inverters.

A. line
B. load
C. forced
D. external-pulse
Answer» C. forced
Discussion
2.

The natural reversal of ac supply voltage commutates the SCR in case of

A. forced commutation
B. only line commutation
C. only natural commutation
D. both line & natural commutation
Answer» E.
Discussion
3.

The type of commutation in which the pulse to turn off the SCR is obtained by separate voltage source is

A. class B commutation
B. class C commutation
C. class D commutation
D. class E commutation
Answer» E.
Discussion
4.

An SCR is connected in series with L = 5 mH and C = 20 F. Find the resonant frequency of the circuit.

A. 2569 rad/s
B. 3162 rad/s
C. 2400 rad/s
D. 7889 rad/s
Answer» C. 2400 rad/s
Discussion
5.

In case of class B commutation or resonant-pulse commutation with L = 5 H and C = 20 C with the initial voltage across the capacitor (Vs) = 230 V. Find the conduction time for auxiliary thyristor.

A. 0.23 s
B. 6.57
C. 31.41 s
D. 56 s
Answer» D. 56 s
Discussion
6.

In case of class B commutation or resonant-pulse commutation with L = 5 H and C = 20 C with initial voltage across the capacitor (Vs) = 230 V. Find the peak value of resonant current.

A. 560 A
B. 460 A
C. 360 A
D. 260 A
Answer» C. 360 A
Discussion