Silicon Controlled Rectifiers

21. The normal way to turn on a SCR is by __________

1. Breakover voltage
2. Appropriate anode current
3. Appropriate gate current
4. None of the above

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22. We can control a.c. power in a load by connecting __________

1. Two SCRs in series
2. Two SCRs in parallel
3. Two SCRs in parallel opposition
4. None of the above

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23. When an SCR is turned on, the voltage across it is about __________

1. Zero
2. 10 V
3. 2 V
4. 1 V

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24. When SCR is OFF, the current in the circuit is __________.

1. Exactly zero
2. Small leakage current
3. Large leakage current
4. None of the above

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25. When SCR starts conducting, then __________. loses all control

1. Gate
2. Cathode
3. Anode
4. None of the above

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