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Power Electronics

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

 Carbon.
 Iron.
 Silver.
  Aluminium.

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Power Electronics
A triac is equivalent to two SCRs ___________.

In series
None of these
In inverse-parallel
In parallel

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

High
Extremely low
None of these
Low

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Power Electronics
A power semiconductor may undergo damage due to

 Low dv/dt.
 High dv/dt.
 Low di/dt.
  High di/dt.

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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?

  8 KV.
 6 KV.
 10 KV.
 2 KV.

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Power Electronics
A diac is turned on by ___________.

Gate voltage
A breakover voltage
None of these
Gate current

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