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Power Electronics

Power Electronics
The typical value of SCR for modern alternator is

 0.5.
 1.5.
 1.0.
 1.2.

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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 ?

  0.3 ohm
 3.0 ohm
 0.3 ohm
 0.03 ohm

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

 150 µs.
 200 µs.
 300 µs.
  100 µs.

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Power Electronics
A Triac has three terminals viz ___________

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

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Power Electronics
To meet high current demand we use SCRs in

 both B and C.
  parallel connection.
 anti parallel connection.
 series connection.

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Power Electronics
Leakage current flows through the thyristor in

 reverse blocking mode.
  both forward and reverse blocking mode.
 forward blocking mode.
 forward conduction mode.

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