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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

  37.14.
 65.
 3.714.
 60.

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Power Electronics
Leakage current flows through the thyristor in

  both forward and reverse blocking mode.
 forward blocking mode.
 forward conduction mode.
 reverse blocking mode.

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

 series R and diode with C across R.
 R and C in series but with diode across C.
  R and C in series but with diode across R.
 series R and diode with C across R.

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3 µs.
 3.1 µs
  3.3 µs
 3.2 µs

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Power Electronics
A power semiconductor may undergo damage due to

 Low di/dt.
  High di/dt.
 High dv/dt.
 Low dv/dt.

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Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

None of these
Less than
Equal to
More than

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