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.

A single phase full bridge inverter has RLC load with R = 4 Ω, L = 35 mH and C = 155 μF. The dc input voltage is 230 V and the output frequency is 50 Hz. Find the rms value of the fundamental load current.

A. 28.31 A
B. 20.02 A
C. 16.69 A
D. 26.90 A
Answer» C. 16.69 A
Discussion
2.

A single phase full bridge inverter has RLC load. The dc input voltage is 230 V and the output frequency is 50 Hz. Find the expression for the load voltage up to the fifth harmonic.

A. 292 sin 314t + 97.62 sin 314t + 58.57 sin 318t + 28.31 sin 318t + 3.686 sin 318t
B. 292 sin 314t + 97.62 sin (3 x 314t) + 58.57 sin (5 x 318t)
C. 292 sin 314t + 97.62 sin (2 x 314t) + 58.57 sin (3 x 318t) + 28.31 sin (4 x 318t) + 3.686 sin (5 x 318t)
D. 292 sin 512t + 25.62 sin 249t + 6.74 sin 508t
Answer» C. 292 sin 314t + 97.62 sin (2 x 314t) + 58.57 sin (3 x 318t) + 28.31 sin (4 x 318t) + 3.686 sin (5 x 318t)
Discussion
3.

For a full bridge inverter with the following load: R = 2 Ω, XL = 8 Ω and XC = 6 Ω.

A. The output voltage lags the current by 45°
B. The output current lags the voltage by 45°
C. The output current lags the voltage by 90°
D. The output current lags the voltage by more than 90°
Answer» C. The output current lags the voltage by 90°
Discussion
4.

A single phase full bridge inverter is fed from a dc source such that the fundamental component of output voltage = 230 V. Find the rms value of SCR and diode current respectively, for a R load of 2 Ω.

A. 115 A, 80 A
B. 81.33 A, 36.2 A
C. 36.2 A, 0 A
D. 81.33 A, 0 A
Answer» E.
Discussion
5.

A single phase full bridge inverter circuit, has load R = 2 Ω and dc source Vs = 230 V. Find the value of power delivered to the load in watts only due to the fundamental component of the load current.

A. 5361.5 W
B. 2142.5 W
C. 21424.5 W
D. 214.2 W
Answer» D. 214.2 W
Discussion
6.

In a half wave circuit, forced commutation is essential when the

A. load is inductive
B. load is resistive
C. source voltage is below 150 V
D. none of the mentioned
Answer» C. source voltage is below 150 V
Discussion
7.

In a half wave bridge inverter circuit, the power delivered to the load by each source is given by

A. Vs x Is
B. (Vs x Is)/2
C. 2(Vs x Is)
D. None of the mentioned
Answer» C. 2(Vs x Is)
Discussion
8.

A certain full bridge type inverter circuit has its rms value of fundamental load current component given by W. The fundamental frequency component of the load current would be given by

A. W sin ωt
B. (W/√2) sin ωt
C. √2 W sin ωt
D. sin ωt
Answer» D. sin ωt
Discussion
9.

A single phase full bridge inverter has load R = 2 Ω, and dc voltage source Vs = 230 V. Find the rms value of the fundamental load current.

A. 96 A
B. 0 A
C. 103 A
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
10.

A single phase full bridge inverter has a dc voltage source Vs = 230 V. Find the rms value of the fundamental component of output voltage.

A. 90 V
B. 207 V
C. 350 V
D. 196 V
Answer» C. 350 V
Discussion