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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

  10 mA.
 60 mA.
 40 mA.
 23 mA.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.03 ohm
 0.3 ohm
 3.0 ohm
  0.3 ohm

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Power Electronics
The device that exhibits negative resistance region is ___________.

Triac
Diac
UJT
Transistor

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Power Electronics
A power semiconductor may undergo damage due to

 Low dv/dt.
  High di/dt.
 Low di/dt.
 High dv/dt.

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Power Electronics
A diac is ___________ switch

A mechanical
A d.c.
An c.
None of these

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Power Electronics
Which of the following is not a characteristic of UJT?

Bilateral conduction
Intrinsic stand off ratio
Peak-point voltage
Negative resistance

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