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Power Electronics

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

 60 mA.
 23 mA.
 40 mA.
  10 mA.

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Saturation
Cut-off
None of these
Negative resistance

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Power Electronics
Which of the following is used in heat sink?

 Carbon.
  Aluminium.
 Iron.
 Silver.

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

  800 V/µs.
 1200 V/µs.
 600 V/µs.
 1000 V/µs.

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Power Electronics
Leakage current flows through the thyristor in

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

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Power Electronics
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant

SCR
None of these
UJT
Transistor

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