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.

A step down chopper has Vs = 220 V and is connected to RLE load. With R = 1 , E = 24 V and L = 5 mH. The chopping period is 2000 s and the on-period is 600 s. Find the value of minimum steady state output current.

A. 33 A
B. 42 A
C. 0 A
D. 51 A
Answer» E.
Discussion
2.

A type A step down chopper has Vs = 220 V and is connected to RLE load. With R = 1 , E = 24 V and L large enough to maintain continuous conduction. Find the average value of load current for a duty cycle of 30 %.

A. 100 A
B. 22 A
C. 42 A
D. 16.5 A
Answer» D. 16.5 A
Discussion
3.

The expression for the thyristor (chopper switch) current is given by
I = ( 2.Vs E)/R

A. nFind the value of firing angle , for which the thyristor current is maximum.
B. 2Vs/
C. 180
D. E/2Vs
E. Vs/R
Answer» D. E/2Vs
Discussion
4.

Find the expression for the ripple factor in terms of duty cycle for a type A step down chopper

A. (1- / )
B. <sup>2</sup>/2
C. /2
D. (1- )
Answer» B. <sup>2</sup>/2
Discussion