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Power Electronics

Power Electronics
The typical value of SCR for modern alternator is

 1.2.
 0.5.
 1.5.
 1.0.

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Power Electronics
A diac is simply ___________.

A triac without gate terminal
None of these
A single junction device
A three junction device

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Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 40 mA.
 60 mA.
  10 mA.
 23 mA.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.3 ohm
 3.0 ohm
 0.03 ohm
  0.3 ohm

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Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.2.
 0.7.
  0.25.
 0.75.

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Power Electronics
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

 one resistor across the string.
 resistors of different values across each SCR.
 one resistor in series with each SCR.
  resistors of the same value across each SCR.

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