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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
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Q. 251) In a 3 phase full converter, the firing angle is less than 60°. The instantaneous output voltage

(A) will have positive part only
(B) will have both positive and negative parts
(C) may have both positive and negative parts
(D) will have negative part if load is inductive
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Mr. Dubey • 51.43K Points
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Q. 252) In a stud mounted SCR, the stud is

(A) in thermal contact with heat sink
(B) insulated from heat sink
(C) in electrical and thermal contact with heat sink
(D) in either electrical or thermal contact with heat sink
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Mr. Dubey • 51.43K Points
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Q. 253) In a full bridge inverter, the waveshape of load current depends on

(A) relative values of load parameters R, L and C
(B) relative values of load parameters R and L
(C) relative values of load parameters L and C
(D) gating frequency
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Mr. Dubey • 51.43K Points
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Q. 254) The characteristics of which device has peak point and valley point

(A) SCR
(B) PUT
(C) SCS
(D) Shockley diode
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Mr. Dubey • 51.43K Points
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Q. 255) In an ordinary thyristor

(A) turn on and turn off times are equal
(B) turn on time is more than turn off time
(C) turn off time is more than turn on time
(D) turn on time may be equal, less than or more than turn off time
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Mr. Dubey • 51.43K Points
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Q. 256) Thyristors connected in series need :

(A) static equalizing circuit
(B) dynamic equalizing circuit
(C) both static and dynamic equalizing circuits
(D) none of the above
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Mr. Dubey • 51.43K Points
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Q. 257) If 4 quadrant operation is required we need

(A) dual converter
(B) full converter
(C) semi converter
(D) none of the above
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Mr. Dubey • 51.43K Points
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Q. 258) Which of the following devices exhibit negative resistance characteristics?

(A) UJT
(B) PUT
(C) Both UJT and PUT
(D) UJT, PUT and SBS
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Mr. Dubey • 51.43K Points
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Q. 259) As compared to BJT, MOSFET has

(A) lower switching losses and higher conduction losses
(B) higher switching losses and higher conduction losses
(C) higher switching losses and lower conduction losses
(D) lower switching losses and lower conduction losses
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Mr. Dubey • 51.43K Points
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Q. 260) A single phase bridge type cycloconverter uses eight thyristors.

(A) True
(B) False
(C) none
(D) all
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