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Power Electronics

Power Electronics
The typical value of SCR for modern alternator is

 1.0.
 1.2.
 0.5.
 1.5.

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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

  76.3 %.
 91.6 %.
 90.9 %.
 83.3 %.

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Power Electronics
Snubber circuit is used with SCR

  in parallel.
 anti parallel.
 either series or parallel.
 in series.

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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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Power Electronics
By which one of the following we can measure the reliability of a string?

 Reliability factor.
 String efficient.
 Factor of safety.
  Derating factor.

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Power Electronics
A triac is equivalent to two SCRs ___________.

In parallel
In inverse-parallel
In series
None of these

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