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Dear candidates you will find MCQ questions of Power Electronics here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

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Mr. Dubey • 51.43K Points
Coach

Q. 121) A relaxation oscillator uses

(A) tunnel diode
(B) UJT
(C) both tunnel diode and UJT
(D) PIN diode
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Mr. Dubey • 51.43K Points
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Q. 122) In a 3 phase bridge inverter with 180° mode of operation the numbers of thyristors conducting at one time are

(A) 1
(B) 2
(C) 3
(D) 4
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Mr. Dubey • 51.43K Points
Coach

Q. 123) A single phase full converter can operate in

(A) 4 quadrants
(B) 3 quadrants
(C) 2 quadrants
(D) 1 quadrant
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Mr. Dubey • 51.43K Points
Coach

Q. 124) In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle

(A) is zero
(B) is 60°
(C) is more than 60°
(D) is more than 90°
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Mr. Dubey • 51.43K Points
Coach

Q. 125) A 3 phase dual converter consists of

(A) two 3 phase semiconverters connected in parallel
(B) two 3 phase semiconverters connected in antiparallel
(C) two 3 phase full converters connected in antiparallel
(D) two 3 phase full converters connected in parallel
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Mr. Dubey • 51.43K Points
Coach

Q. 126) Which inverter circuit uses coupled inductors?

(A) Modified McMurray full bridge inverter
(B) McMurray Bedford half bridge inverter
(C) Modified McMurray Bedford half bridge inverter
(D) Both (b) and (c)
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Mr. Dubey • 51.43K Points
Coach

Q. 127) When an SCR is in forward blocking mode, the applied voltage

(A) appears across only one junction
(B) is equally shared by two junctions
(C) is equally shared by three junctions
(D) may appear across one or more junctions
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Mr. Dubey • 51.43K Points
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Q. 128) In sinusoidal PWM for inverters the width of different pulses are not the same.

(A) True
(B) False
(C) none
(D) all
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Mr. Dubey • 51.43K Points
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Q. 129) The symbol in figure is for

(A) UJT
(B) PUT
(C) SCS
(D) SBS
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Mr. Dubey • 51.43K Points
Coach

Q. 130) Mc Murray full bridge inverter uses

(A) 4 thyristors and 2 diodes
(B) 4 thyristors and 4 diodes
(C) 8 thyristors and 4 diodes
(D) 8 thyristors and 8 diodes
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