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

Correct answer: (A)
Open-loop control system

2. A diac has

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

Correct answer: (C)
two pn junctions

3. A diac has how many semiconductor layers?

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

Correct answer: (A)

4. A diac has how many terminals?

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

Correct answer: (A)

5. A diac is _________ switch.

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

Correct answer: (A)
an AC

6. A diac is simply

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

Correct answer: (C)
a triac without a gate terminal

7. A diac is turned on by

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

Correct answer: (A)
breakover voltage

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

Correct answer: (C)

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

Correct answer: (A)
Root locus

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

Correct answer: (B)

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