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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Two
Four
Five
Three

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Power Electronics
A power MOSFET has three terminals called

 Drain, source and base.
 Collector, emitter and gate.
 Collector, emitter and base.
  Drain, source and gate.

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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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Power Electronics
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?

  Fast acting current limiting device (FACL fuse).
 Snubber circuit.
 Voltage clamping device.
 CB.

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

 11.19 ohm
 108 ohm
  111.9 ohm
 115 ohm

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Power Electronics
A triac is equivalent to two SCRs ___________.

None of these
In parallel
In series
In inverse-parallel

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