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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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Q. 181) Bidirectional semiconductor device is

(A) Diode
(B) BJT
(C) SCR
(D) TRIAC
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Q. 182) With gate open, the maximum anode current at which SCR is turned off from ON condition is called

(A) breakdown voltage
(B) peak reverse voltage
(C) holding current
(D) latching current
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Q. 183) The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as

(A) both as forward characteristics
(B) both as reverse characteristics
(C) former as forward characteristics and later as reverse characteristics
(D) former as reverse characteristics and later as forward characteristics
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Q. 184) Form factor of a rectifier is the ratio of

(A) Root mean square value of voltage and current to its peak value
(B) Root mean square value of voltage and current to its average value
(C) Average value of current and voltage to its root mean square value
(D) Peak value of current and voltage to its root mean square value
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Q. 185) Ripple factor is the ratio of

(A) Rms value of the ac component of load voltage to the dc voltage
(B) Average value of the ac component of load voltage to the peak value of voltage
(C) Average value of the dc component of load voltage to the ac voltage
(D) Peak value of the dc component of load voltage to the ac voltage
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Q. 186) Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of

(A) AC input power to the transformer volt - amp rating required by secondary
(B) AC input power to the transformer volt - amp rating required by primary
(C) DC output power to the transformer volt - amp rating required by secondary
(D) DC output power to the transformer volt - amp rating required by primary
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Q. 187) Which of the following finds application in speed control of a dc motor?

(A) FET
(B) NPN transistor.
(C) SCR.
(D) None of the above.
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Q. 188) In mercury arc rectifiers the voltage drop in arc is nearly

(A) 0.1 volt per centimeter of arc length
(B) 1 volt per centimeter of arc length
(C) 10 volts per centimeter of arc length
(D) 12 to 15 volts per centimeter of arc length.
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Q. 189) A cycloconverter is a _________

(A) one stage power converter
(B) one stage voltage converter
(C) one stage frequency converter
(D) none of the mentioned
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Q. 190) Applications of cycloconverters include

(A) speed control of ac drives
(B) induction heating
(C) static VAr compensation
(D) all of the mentioned
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