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Power Electronics

Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

  37.14.
 60.
 3.714.
 65.

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

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

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Power Electronics
During reverse recovery time

 charge carrier of junction J1 is swept out.
 charge carrier of junction J3 is swept out.
  both B and C.
 charge carrier of junction J2 recombined.

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

Frequencies above 1000 kHz
Frequencies above 20 kHz
Frequencies less than 10 Hz
50 Hz frequency

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

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

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

  10 mA.
 60 mA.
 23 mA.
 40 mA.

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