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Power Electronics

Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 P2.
 P1.
  N1.
 N2.

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Power Electronics
A UJT is sometimes called ___________ diode.

Double-base
High resistance
Single-base
Low resistance

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Power Electronics
Which following is a two terminal three layer device?

 BJT.
 MOSFET.
 None of above.
  Power dioed.

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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?

 108 ohm
 115 ohm
 11.19 ohm
  111.9 ohm

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Power Electronics
The typical value of SCR for modern alternator is

 1.2.
 0.5.
 1.5.
 1.0.

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Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

 6, 4.
 5, 7.
 4, 6.
  7, 5.

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