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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 • 51.32K Points
Coach

Q. 221) With increase in firing angle,

(A) Both harmonic distortion and quality of input current increases
(B) Harmonic distortion increases and quality of input current decreases
(C) Harmonic distortion decreases and quality of input current increases
(D) Both harmonic distortion and quality of input current decreases
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Mr. Dubey • 51.32K Points
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Q. 222) The power MOSFET device is a

(A) Current controlled unipolar device
(B) Voltage controlled unipolar device
(C) Current controlled bipolar device
(D) Voltage controlled bipolar device
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Mr. Dubey • 51.32K Points
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Q. 223) In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be

(A) 30 A
(B) 152 A
(C) 15 A
(D) none
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Mr. Dubey • 51.32K Points
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Q. 224) During forward blocking state of SCR, the voltage and current respectively are

(A) high and high
(B) low and low
(C) high and low
(D) low and high
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Mr. Dubey • 51.32K Points
Coach

Q. 225) In a 3 phase full converter the average load current is 150 A. The average thyristor current is

(A) 150 A
(B) 75A
(C) 50 A
(D) 25 A
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Mr. Dubey • 51.32K Points
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Q. 226) The two modes of operation of three phase bridge inverters are known as

(A) 60° mode and 120° mode
(B) 90° mode and 120° mode
(C) 120° mode and 180° mode
(D) 120° mode and 240° mode
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Mr. Dubey • 51.32K Points
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Q. 227) In a 3 phase fully controlled converter the firing frequency is

(A) 3 times the line frequency
(B) 6 times the line frequency
(C) 9 times the line frequency
(D) 12 times the line frequency
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Mr. Dubey • 51.32K Points
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Q. 228) Two thyristor of same rating and same specifications

(A) will have equal turn on and turn off periods
(B) will have equal turn on but unequal turn off periods
(C) may have equal or unequal turn on and turn off periods
(D) will have unequal turn on and turn off periods
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Mr. Dubey • 51.32K Points
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Q. 229) The amount of dielectric heating is inversely proportional to frequency.

(A) True
(B) False
(C) none
(D) all
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Mr. Dubey • 51.32K Points
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Q. 230) A semiconverter feeding an RLE load operates in

(A) first quadrant only
(B) first and second quadrants
(C) first and fourth quadrants
(D) first and third quadrants
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