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Power Electronics

Power Electronics
A triac is a ___________ switch

Mechanical
Bidirectional
None of these
Unidirectional

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Power Electronics
Spread time is defined as the interval during which

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

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Power Electronics
IGBT combines the advantages of

 SITs and MOSFETs.
 BJTs and SITs.
  BJTs and MOSFETs.
 None of these.

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

 2 KV.
 10 KV.
 6 KV.
  8 KV.

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Power Electronics
Which statement is true for latching current ?

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

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Power Electronics
Leakage current flows through the thyristor in

  both forward and reverse blocking mode.
 forward blocking mode.
 reverse blocking mode.
 forward conduction mode.

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