Power electronics MCQ #11

1) The leakage current in NPN transistors is due to flow of

      (a) electrons from collector to base.

      (b) holes from collector to base.

      (c) minority carriers from collector to emitter.

      (d) holes from base to emitter.

2) The reverse saturation current in a transistor is

      (a) double for every 10-degree C rise in temperature

      (b) double for every 1-degree C rise in temperature

      (c) decrease linearly with temperature

      (d) increase linearly with temperature

3) The voltage gain in a common collector amplifier is

      (a) constant

      (b) varies with input voltage

      (c) less than 1

      (d) varies with load impedance

4) Which specification is not correct for a common collector amplifier?

      (a) low output impedance

      (b) high input impedance

      (c) high voltage gain

      (d) high current gain

ANSWER: | 1-b | 2-a | 3-c | 4-c |

5) Transistor is in saturation when

      (a) Ib = Ic

      (b) Ib > Ic/ β dc

      (c) Ib = 0

      (d) Ib < Ic/ β dc

6) The voltage follower is commonly used as

      (a) regulator

      (b) isolator

      (c) switch

      (d) none of the above

7) OP-AMP have become very popular because

      (a) they are very cheap

      (b) they are extremely small in size

      (c) they are available in different package

      (d) their external characteristic can be altered to suit any application

8) Which one of the following causes phase shift through an OP-AMP

      (a) internal RC circuit

      (b) external RC circuit

      (c) negative feedback

      (d) gain roll OFF of the internal transistor

ANSWER: | 5-b | 6-a | 7-d | 8-d |

9) UV radiation is used in IC fabrication process for

      (a) masking

      (b) diffusion

      (c) isolation

      (d) metallization

10) The integrated circuit chip NE/SE 566 is a

      (a) Schmitt trigger

      (b) power amplifier

      (c) voltage-controlled oscillator

      (d) video amplifier

11) The output of an integrator is _____ for a step input.

      (a) a ramp

      (b) a triangular waveform

      (c) a spike

      (d) a pulse

12) NOTCH filter is also known as

      (a) band pass filter

      (b) narrow band reject filter

      (c) high pass filter

      (d) low pass filter

ANSWER: | 9-a | 10-c | 11-a | 12-b |

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Power electronics MCQ PDF #11