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Power Electronics

Power Electronics
The UJT may be used as ___________.

Am amplifier
None of these
A rectifier
A sawtooth generator

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

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

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Power Electronics
The maximum di/dt in a SCR is

 Inversely proportional to supply voltage.
  Both A and B.
 Directly proportional to supply voltage.
 Directly proportional to inductance in the circuit.

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Power Electronics
SCRs are used in series to meet

  high voltage demand.
 low current demand.
 low voltage demand.
 high current demand.

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

 Circuit breaker.
 Fuse.
 Equalizing circuit.
  Snubber circuit.

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

 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.
 series R and diode with C across R.

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