A.C Fundamentals, Circuits And Circuit Theory MCQ Questions & Answers

1

Which of the following refers to a parallel circuit?

A) The current through each element is same B) The voltage across element is in proportion to it's resistance value C) The equivalent resistance is greater than any one of the resistors D) The current through any one element is less than the source current

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Answer & Solution

Answer: Option D

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2

In any A.C. circuit always

A) Apparent power is more than actual power B) Reactive power is more than apparent power C) Actual power is more than reactive power D) Reactive power is more than actual power

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Answer & Solution

Answer: Option A

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3

The transient currents are associated with the

A) Changes in the stored energy in the inductors and capacitors B) Impedance of the circuit C) Applied voltage to the circuit D) Resistance of the circuit

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Answer & Solution

Answer: Option A

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4

The inductance of a coil can be increased by

A) Increasing core length B) Decreasing the number of turns C) Decreasing the diameter of the former D) Choosing core material having high relative permeability

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Answer & Solution

Answer: Option D

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5

Power factor of an electrical circuit is equal to

A) $$\frac{{\text{R}}}{{\text{Z}}}$$ B) Cosine of phase angle difference between current and voltage C) Ratio of useful current to total current $$\frac{{I{\text{w}}}}{l}$$ D) All above

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Answer & Solution

Answer: Option D

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6

The 'time constant' of a series RC circuit is

A) $$\frac{{\text{C}}}{{\text{R}}}$$ B) $$\frac{{\text{R}}}{{\text{C}}}$$ C) $$\frac{1}{{{\text{RC}}}}$$ D) $${\text{RC}}$$

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Answer & Solution

Answer: Option D

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7

The power is measured in terms of decibels in case of

A) Electronic equipment B) Transformers C) Current transformers D) Auto transformers

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Answer & Solution

Answer: Option A

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8

Inductance affects the direct current flow

A) Only at the time of turning off B) Only at the time of turning on C) At the time of turning on and off D) At all the time of operation

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Answer & Solution

Answer: Option C

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9

The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces

A) The more heat than produced by A.C. when flowing through the same circuit B) The same heat as produced by A.C. when flowing through the same circuit C) The less heat than produced by A.C. flowing through the same circuit D) None of the above

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Answer & Solution

Answer: Option B

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10

The ratio of active power to apparent power is known as factor.

A) Demand B) Load C) Power D) Form

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Answer & Solution

Answer: Option C

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A.C Fundamentals, Circuits And Circuit Theory MCQ Questions & Answers | Electrical Engineering