Power Electronics MCQs with answers Page - 1

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Q. In a flyback converter, the inductor of the buck-boost converter has been replaced by a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

A

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Q. 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

A

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Q. 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

A

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Q. 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. 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. 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. 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. 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. 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. 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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