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Power Electronics

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

 MCT.
 FCT.
  IGBT.
 GTO.

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

  low.
 high.
 moderate.
 infinity.

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Power Electronics
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.

Extremely low
None of these
Low
High

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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 ?

 0.3 ohm
 3.0 ohm
  0.3 ohm
 0.03 ohm

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

None of these
Is decreased
Remains the same
Is increased

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Power Electronics
Which of following is not a power transistor?

 COOLMOS.
 IGBTs.
  TRIAC.
 SITS.

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