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Power Electronics

Power Electronics
IGBT combines the advantages of

 None of these.
 SITs and MOSFETs.
 BJTs and SITs.
  BJTs and MOSFETs.

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Power Electronics
Which statement is true for latching current ?

 It is related to turn off process of the device.
 Both C and D.
 It is related to conduction process of device.
  It is related to turn on process of the device.

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Power Electronics
A triac is a ___________ switch

Unidirectional
None of these
Mechanical
Bidirectional

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

 Fuse.
 Equalizing circuit.
  Snubber circuit.
 Circuit breaker.

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 1200 V/µs.
 1000 V/µs.
  800 V/µs.
 600 V/µs.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.03 ohm
  0.3 ohm
 0.3 ohm
 3.0 ohm

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