DAPZOI
Home Topics Quiz Login


Power Electronic Devices MCQ Questions & Answers

Power Electronic Devices MCQs : This section focuses on the "Power Electronic Devices". These Multiple Choice Questions (MCQs) should be practiced to improve the Power Electronic Devices skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

100 V rated 3 SCRs are connected in series. The operation voltage of the string is 200. Calculate the De-rating factor.

A. 0.35
B. 0.33
C. 0.38
D. 0.18

View Answer

Question 2

400 V rated 5 SCRs are connected in series. The operation voltage of the string is 500. Calculate the string efficiency.

A. 25 %
B. 40 %
C. 38 %
D. 35 %

View Answer

Question 3

A step-down chopper has input voltage 40 V and output voltage 20 V. Calculate the value of the duty cycle.

A. 0.5
B. 0.2
C. 0.3
D. 0.4

View Answer

Question 4

Calculate peak-peak voltage if Vmax=200 V and Vmin=190 V.

A. 20 V
B. 10 V
C. 60 V
D. 80 V

View Answer

Question 5

Calculate the De-rating factor if the string efficiency is 20 %.

A. 0.8
B. 0.4
C. 0.5
D. 0.6

View Answer

Question 6

Calculate the string efficiency if the de-rating factor is .48.

A. 48 %
B. 52 %
C. 50 %
D. 60 %

View Answer

Question 7

Gate triggering is more reliable.

A. True
B. False

View Answer

Question 8

R-L-C overdamped loads are generally lagging power factor loads.

A. True
B. False

View Answer

Question 9

The range of On-State voltage drop is _______

A. 1-1.6 V
B. 0-1 V
C. 1.6-2 V
D. 2.4-3 V

View Answer

Question 10

The range of turn-off time is _______

A. .51-3 ?sec
B. 3-101 ?sec
C. 9-400 ?sec
D. 7-787 ?sec

View Answer

Question 11

Third lowest order harmonic present in 3-? fully controlled rectifier is __________

A. 11th
B. 17th
C. 13th
D. 22nd

View Answer

Question 12

Thyristors are used in parallel to complete ________

A. High voltage demand
B. High current demand
C. Low current demand
D. Low voltage demand

View Answer

Question 13

Thyristors are used in series to complete ________

A. High voltage demand
B. High current demand
C. Low voltage demand
D. Low current demand

View Answer

Question 14

Which harmonic is not present in 3-? fully controlled rectifier?

A. 27rd harmonic
B. 15th harmonic
C. 17th harmonic
D. 12th harmonic

View Answer

Question 15

Which one of the following load is suitable for load commutation in Single phase Half-bridge inverter?

A. R-L load
B. R-L-C overdamped
C. R-L-C underdamped
D. L-load

View Answer

Question 16

400 V rated 5 SCRs are connected in series. The operation voltage of the string is 500. Calculate the string efficiency.

A. 25%
B. 40%
C. 38%
D. 35%

View Answer

Question 17

Calculate the string efficiency if the de-rating factor is .48.

A. 48%
B. 52%
C. 50%
D. 60%

View Answer

Question 18

The range of turn-off time is _______

A. .51-3 μsec
B. 3-101 μsec
C. 9-400 μsec
D. 7-787 μsec

View Answer

Question 19

Third lowest order harmonic present in 3-Φ fully controlled rectifier is __________

A. 11th
B. 17th
C. 13th
D. 22nd

View Answer

Question 20

Which harmonic is not present in 3-Φ fully controlled rectifier?

A. 27rd harmonic
B. 15th harmonic
C. 17th harmonic
D. 12th harmonic

View Answer