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Power Electronics

Power Electronics
Thermal voltage VT can be given by

 qT/K.
 (K2/q)(T + 1/T - 1).
 KT/q.
  Kq/T.

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

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

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Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

  7, 5.
 4, 6.
 5, 7.
 6, 4.

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Power Electronics
How can we protect SCR from thermal conditions ?

  Using heat sink.
 Use of snubber circuit.
 Using equalizing circuit.
 Using CB and fuse.

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Power Electronics
In a UJT, the p-type emitter is ___________ doped

Moderately
None of these
Heavily
Lightly

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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.
 one resistor in series with each SCR.
 resistors of different values across each SCR.

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