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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. 201) A single-phase full bridge inverter can operate in load-commutation mode in case load consists of:

(A) RL load
(B) RLC underdamped
(C) RLC damped
(D) RLC critically damped
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Mr. Dubey • 51.43K Points
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Q. 202) Practical way of obtaining static voltage equalization in series connected SCRs is by the use of:

(A) One resistor across the string
(B) Resistors of different values across each SCR
(C) Resistors of the same value across each SCR
(D) One resistor in series with each SCR
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Mr. Dubey • 51.43K Points
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Q. 203) A resistor connected across the gate and cathode of an SCR in a circuit increases its

(A) dv/dt rating
(B) Holding current
(C) Noise Immunity
(D) Turn-off time
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Mr. Dubey • 51.43K Points
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Q. 204) In thyristor, holding current is:

(A) more than the latching current
(B) less than the latching current
(C) equal to latching current
(D) none of the above
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Mr. Dubey • 51.43K Points
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Q. 205) When a thyristor turn on, the gate drive:

(A) can be turned down but thyristor remains in on position
(B) cannot be turned down as thyristor will be turned off
(C) gate drive has no impact on starting and turning off the thyristor
(D) none of the above
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Mr. Dubey • 51.43K Points
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Q. 206) A thyristor can be termed as:

(A) DC switch
(B) AC switch
(C) both AC and DC switch
(D) none of the above
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Mr. Dubey • 51.43K Points
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Q. 207) During forward blocking state, a thyristor is associated with:

(A) large current and low voltage
(B) low current and large voltage
(C) medium current and large voltage
(D) None of the above
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Mr. Dubey • 51.43K Points
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Q. 208) Turn-off time of an SCR is measured from the instant:

(A) anode current becomes zero
(B) anode voltage becomes zero
(C) anode voltage and anode current becomes zero
(D) gate current becomes zero
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Mr. Dubey • 51.43K Points
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Q. 209) A forward voltage can be applied to an SCR after its:

(A) anode current reduces to zero
(B) gate recovery time
(C) reverse recovery time
(D) anode voltage reduces to zero
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Mr. Dubey • 51.43K Points
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Q. 210) In a thyristor, the magnitude of the anode current will:

(A) increase if the gate current is increased
(B) decrease if the gate current is decreased
(C) increase if gate current is decreased
(D) no change with the variation of the gate current
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