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Power Electronics

Power Electronics
A diac is ___________ switch

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

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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?

 6 KV.
  8 KV.
 10 KV.
 2 KV.

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Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 high.
  low.
 infinity.
 moderate.

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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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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 90.
 70.
  80.
 60.

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Power Electronics
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is

 MCT.
 GTO.
  IGBT.
 FCT.

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