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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.
 60.
 65.

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

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

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

None of these
Cut-off
Saturation
Negative resistance

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Power Electronics
A diac is turned on by ___________.

Gate current
A breakover voltage
Gate voltage
None of these

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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 underdamped.
 RL.
 RLC overdamped.

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Power Electronics
By which one of the following we can measure the reliability of a string?

 String efficient.
 Factor of safety.
 Reliability factor.
  Derating factor.

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