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Power Electronics

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

 Carbon.
 Silver.
 Iron.
  Aluminium.

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Power Electronics
The normal way to turn on a diac is by ___________.

Gate current
Breakover voltage
None of these
Gate voltage

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Power Electronics
Leakage current flows through the thyristor in

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

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.01 A.
 0.002 A.
  0.004 A.
 0.009 A.

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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.
 600 V/µs.
 1000 V/µs.
 1200 V/µs.

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 moderate value.
 zero value.
 low value.
  high value.

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