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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.01 A.
  0.004 A.
 0.009 A.
 0.002 A.

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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
A triac can pass a portion of ___________ half-cycle through the load.

Both positive and negative
Only negative
Only positive
None of these

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Power Electronics
A thyristor can termed as

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

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Power Electronics
A diac has ___________ semiconductor layers

Two
Four
Three
None of these

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Power Electronics
Which of the following is not a characteristic of UJT?

Intrinsic stand off ratio
Peak-point voltage
Bilateral conduction
Negative resistance

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