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Power Electronics

Power Electronics
A diac has ___________ terminals.

Three
None of these
Two
Four

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Power Electronics
A thyristor can termed as

 Square wave switch.
 AC switch.
 Both a and B.
  DC switch.

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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?

 115 ohm
 11.19 ohm
 108 ohm
  111.9 ohm

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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 ?

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

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Power Electronics
A diac has ___________ semiconductor layers

Four
Three
None of these
Two

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

 SIT.
 SCR.
  GTO.
 SITH.

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