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Power Electronics

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

Equal to
More than
Less than
None of these

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 1500 A.
 2121.32 A.
 4242.64 A.
 6000 A.

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Power Electronics
Snubber circuit is used with SCR

 in series.
 either series or parallel.
  in parallel.
 anti parallel.

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

  high value.
 zero value.
 low value.
 moderate value.

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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?

  111.9 ohm
 108 ohm
 115 ohm
 11.19 ohm

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

 RLC critically damped.
 RLC overdamped.
 RL.
 RLC underdamped.

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