Explore topic-wise MCQs in Power Electronics.

This section includes 4 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.

Latching current for an SCR is 100 mA, a dc source of 200 V is also connected to the SCR which is supplying an R-L load. Compute the minimum width of the gate pulse required to turn on the device. Take L = 0.2 H & R = 20 ohm both in series.

A. 62.7 sec
B. 100.5 sec
C. 56.9 sec
D. 81 sec
Answer» C. 56.9 sec
Discussion
2.

Consider the two transistor analogy of SCR, if 1 & if 2 are the common-base current gains of both the transistors then to turn-on the device

A. <sub>1</sub> + <sub>2</sub> should approach zero
B. <sub>1</sub> x <sub>2</sub> should approach unity
C. <sub>1</sub> <sub>2</sub> should approach zero
D. <sub>1</sub> + <sub>2</sub> should approach unity
Answer» E.
Discussion
3.

From the two transistor (T1 & T2) analogy of SCR, the total anode current of SCR is ___________ in the equivalent circuit.

A. the sum of both the base currents
B. the sum of both the collector current
C. the sum of base current of T1 &amp; collector current of T2
D. the sum of base current of T2 &amp; collector current of T1
Answer» C. the sum of base current of T1 &amp; collector current of T2
Discussion
4.

3.The average gate power dissipation for an SCR is 0.5 Watts the voltage applied to the gate is Vg = 10 V. What is the maximum value of current Ig for safe operation?

A. 0.25 A
B. 10 A
C. 0.05 A
D. 0.1 A
Answer» D. 0.1 A
Discussion