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Power Electronics

Power Electronics
A triac is a ___________ switch

None of these
Bidirectional
Unidirectional
Mechanical

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Power Electronics
Compared to transistor, ______________ have lower on state conduction losses and higher power handling capability

 MOSFETs.
 TRIACs.
 Semi conductor diodes.
  Thyristor.

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Power Electronics
A diac is simply ___________.

A triac without gate terminal
A single junction device
None of these
A three junction device

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Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.32.
  0.27.
  0.45.
  0.67.

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Power Electronics
Which statement is true for latching current ?

  It is related to turn on process of the device.
 Both C and D.
 It is related to turn off process of the device.
 It is related to conduction process of device.

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Power Electronics
Spread time is defined as the interval during which

 anode current rises from 10 % to 90 % of its final value.
 both (A) and (B).
  anode current rises from 90 % to its final value.
 anode voltage drops from 10 % of its initial value to zero.

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