Explore topic-wise MCQs in Power Electronics.

This section includes 5 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 thermal resistance between junction & the SCR ( jc) has the unit

A. / C
B. W/
C. C/W
D. W/ C
Answer» D. W/ C
Discussion
2.

The maximum rms current of an SCR is 50 A. For a 120 sine wave conduction the form factor (FF) = 1.878
Find the average on-state current rating (ITAV).

A. 93.9 A
B. 174 A
C. 26.62 A
D. 68.52 A
Answer» D. 68.52 A
Discussion
3.

The amp2-sec rating of the SCR specifies

A. The power dissipated by the device when fault occurs
B. The energy dissipated by the device when fault occurs
C. The energy that the device can absorb before the fault is cleared
D. The energy that the device can absorb while operating in the forward blocking mode.
Answer» D. The energy that the device can absorb while operating in the forward blocking mode.
Discussion
4.

For an SCR the average & rms values of current are I/4 & I/2 respectively. Calculate the average on-state current rating (ITAV). Take maximum RMS on-state current = 35 A.

A. 8.78 A
B. 10.10 A
C. 17.5 A
D. 24.74 A
Answer» D. 24.74 A
Discussion
5.

For a SCR the maximum rms on-state current is 35 A. If the SCR is used in a resistive circuit for a rectangular wave with conduction angle of 90 . Calculate the average & rms currents respectively.

A. I/4, I/2
B. I/2, I/ 2
C. I/4, I<sup>2</sup>/2
D. I/4, I/ 2
Answer» B. I/2, I/ 2
Discussion