Industrial Electronics

1. A control system in which the output is related to the input by device parameters only.

1. Open-loop control system
2. Closed-loop control system
3. Servomechanism
4. Feedback control system

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2. A diac has

1. one pn junction
2. three pn junctions
3. two pn junctions
4. four pn junctions

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3. A diac has how many semiconductor layers?

1. Three
2. Four
3. Two
4. Five

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4. A diac has how many terminals?

1. Two
2. Three
3. Four
4. Five

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5. A diac is _________ switch.

1. an AC
2. a mechanical
3. a dc
4. both ac and dc

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6. A diac is simply

1. a single junction
2. a three junction device
3. a triac without a gate terminal
4. the SCR

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7. A diac is turned on by

1. breakover voltage
2. gate current
3. gate voltage
4. anode current

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8. A feedback control system in which the controlled variable is mechanical position.

1. Closed-loop feedback control system
2. Open-loop feedback control system
3. Servomechanism
4. Mechanical servomechanism

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9. A locus or path of the roots traced out on the s-plane as a parameter is changed.

1. Root locus
2. Hyperbola
3. Parabola
4. Circle

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10. A normally operated SCR has an anode which is _________ with respect to cathode.

1. negative
2. positive
3. at zero potential
4. at infinite potential

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