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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.

Q. 1) In a flyback converter, the inductor of the buck-boost converter has been replaced by a

(A) Flyback capacitor
(B) Flyback resistor
(C) Flyback transformer
(D) Flyback transistor
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Q. 2) For bidirectional operation of converters

(A) A parallel combination of controllable switch and a diode is used
(B) A parallel combination of controllable switch and capacitor is used
(C) A series combination of controllable switch and a diode is used
(D) A series combination of controllable switch and a capacitor is used
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Q. 3) For a buck converter to reduce the conduction losses in diode

(A) A high on - resistance switch can be added in parallel
(B) A low on - resistance switch can be added in parallel
(C) A high on - resistance switch can be added in series
(D) A low on - resistance switch can be added in series
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Q. 4) A step - down choppers can be used in

(A) Electric traction
(B) Electric vehicles
(C) Machine tools
(D) All of these
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Q. 5) The output current in PWM DC - DC converters is equal to

(A) Average value of the output inductor current
(B) Product of an average inductor current and a function of duty ratio
(C) Either (a) or (b)
(D) None of these
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Q. 6) Advantages of Cuk converter is / are

(A) Large number of reactive component
(B) Low stress on switch
(C) Low stress on capacitor
(D) None of these
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Q. 7) In a push - pull converter, the filter capacitor can be obtained as

(A) Cmin = V / ( Vr L f2 )
(B) Cmin= ( 1 – D ) V / ( Vr L f2 )
(C) Cmin= ( 1 – 2 D ) V / 32 ( Vr L f2 )
(D) Cmin= ( 1 – 2 D ) V / 42 ( Vr L f2 )
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Q. 8) The control method used for PWM dc - dc converter is

(A) Voltage mode control
(B) Current mode control
(C) Hysteric control
(D) All of these
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Q. 9) In current commutated DC-DC choppers, the voltage spike appears across the load when

(A) Voltage across the commutating inductances collapses
(B) The capacitance voltage adds to the supply voltage
(C) Both (a) and (b)
(D) None of these
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Q. 10) In a load commutated DC - DC chopper, the capacitor has a

(A) Symmetric triangular voltage across itself
(B) Symmetric rectangular voltage across itself
(C) Symmetric trapezoidal voltage across itself
(D) Symmetric sinusoidal voltage across itself
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