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Power Electronics

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

  Aluminium.
 Silver.
 Iron.
 Carbon.

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Power Electronics
After proper turn on of thyristor

 gate signal is always present.
  gate signal must be removed.
None of these
 gate signal should present but can be removed.

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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?

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

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Power Electronics
SCRs are used in series to meet

 low voltage demand.
 low current demand.
  high voltage demand.
 high current demand.

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

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Power Electronics
Anode current in an SCR consists of

  either electron or holes.
  Both electron and holes.
  holes only.
  electrons only.

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