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Power Electronics

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

Breakover voltage
Gate current
Gate voltage
None of these

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 91.6 %.
  76.3 %.
 83.3 %.
 90.9 %.

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Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 20 A.
 600 A.
 400 A.
  200 A.

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Power Electronics
The triac is ___________.

Not a thyristor
Like a bidirectional SCR
A four-terminal device
None of these

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Power Electronics
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is

 FCT.
  IGBT.
 MCT.
 GTO.

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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.
 1000 V/µs.
 600 V/µs.

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