EXAMIANS
Which of following is not a power transistor?
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Which semiconductor device acts like a diode and two transistor?
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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
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The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will
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A triac is equivalent to two SCRs ___________.
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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 ?
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The latching current of GTO should be of order
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A diac is simply ___________.
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Which following is a two terminal three layer device?
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A triac has ___________ semiconductor layers.
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