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Power Electronics

Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 3.714.
  37.14.
 65.
 60.

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

None of these
Both positive and negative
Only positive
Only negative

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Power Electronics
During reverse recovery time

 charge carrier of junction J3 is swept out.
 charge carrier of junction J1 is swept out.
 charge carrier of junction J2 recombined.
  both B and C.

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Power Electronics
A triac is equivalent to two SCRs ___________.

None of these
In series
In parallel
In inverse-parallel

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 30° to 150°.
 60° to 180°.
 60° to 120°.
 30° to 180°.

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

 UJT.
 Diac.
 SCR.
  Triac.

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