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Power Electronics

Power Electronics
Which of following is not a power transistor?

 COOLMOS.
 SITS.
  TRIAC.
 IGBTs.

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Power Electronics
SITH is also known as

 None of these.
  Filled controlled diode.
 Silicon controlled rectifier.
 Filled controlled rectifier.

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Power Electronics
After proper turn on of thyristor

None of these
 gate signal should present but can be removed.
  gate signal must be removed.
 gate signal is always present.

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Power Electronics
The UJT may be used as ___________.

A rectifier
A sawtooth generator
Am amplifier
None of these

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

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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
  0.3 ohm
 3.0 ohm
 0.03 ohm

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