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Power Electronics

Power Electronics
The UJT may be used as ___________.

A rectifier
Am amplifier
None of these
A sawtooth generator

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Power Electronics
How can we protect SCR from thermal conditions ?

  Using heat sink.
 Using CB and fuse.
 Using equalizing circuit.
 Use of snubber circuit.

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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?

 115 ohm
 108 ohm
 11.19 ohm
  111.9 ohm

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

 Diac.
 UJT.
 SCR.
  Triac.

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Power Electronics
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

 one resistor in series with each SCR.
 resistors of different values across each SCR.
 one resistor across the string.
  resistors of the same value across each SCR.

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3.1 µs
  3.3 µs
 3 µs.
 3.2 µs

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