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Power Electronics

Power Electronics
Which of following is normally ON device

 BJT.
 TRIAC.
  SIT.
 IGBT.

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

  10 mA.
 23 mA.
 60 mA.
 40 mA.

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

 moderate.
 high.
  low.
 infinity.

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Power Electronics
A triac can pass a portion of ___________ half-cycle through the load.

Both positive and negative
None of these
Only negative
Only positive

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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
 0.03 ohm
 0.3 ohm

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Power Electronics
During reverse recovery time

  both B and C.
 charge carrier of junction J3 is swept out.
 charge carrier of junction J1 is swept out.
 charge carrier of junction J2 recombined.

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