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Power Electronics

Power Electronics
A triac is equivalent to two SCRs ___________.

None of these
In parallel
In inverse-parallel
In series

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

  R and C in series but with diode across R.
 series R and diode with C across R.
 series R and diode with C across R.
 R and C in series but with diode across C.

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Power Electronics
Which statement is true for latching current ?

 Both C and D.
 It is related to turn off process of the device.
 It is related to conduction process of device.
  It is related to turn on process of the device.

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Power Electronics
Light triggering mainly used in

 medium voltage direct current transmission.
  high voltage direct current transmission.
 low - voltage direct current transmission.
  all of these.

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Power Electronics
The maximum di/dt in a SCR is

 Inversely proportional to supply voltage.
 Directly proportional to inductance in the circuit.
  Both A and B.
 Directly proportional to supply voltage.

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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?

 6 KV.
  8 KV.
 2 KV.
 10 KV.

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