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Power Electronics

Power Electronics
Thermal voltage VT can be given by

 qT/K.
 (K2/q)(T + 1/T - 1).
 KT/q.
  Kq/T.

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

  100 µs.
 200 µs.
 150 µs.
 300 µs.

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Power Electronics
A triac is equivalent to two SCRs ___________.

None of these
In series
In inverse-parallel
In parallel

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Power Electronics
To meet high current demand we use SCRs in

  parallel connection.
 both B and C.
 anti parallel connection.
 series connection.

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

Is decreased
Remains the same
None of these
Is increased

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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

 65.
  37.14.
 60.
 3.714.

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