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Power Electronics

Power Electronics
The UJT may be used as ___________.

A rectifier
Am amplifier
A sawtooth generator
None of these

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Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 100 A.
 110 A.
 120 A.
  150 A.

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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?

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

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Same for every case.
  Spread time.
 Delay time.
 Rise time.

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Power Electronics
Materials used in heat sink should have

 high thermal conductivity.
 high melting point.
  All of these.
 large surface area.

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Power Electronics
A Triac has three terminals viz ___________

Two main terminal and a gate terminal
Drain, source, gate
None of these
Cathode, anode, gate

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