A.C. Fundamentals and Circuits Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “A.C. Fundamentals and Circuits ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate A.C. Fundamentals and Circuits comprehensively.

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2.
The peak value of a sine wave is 200 V. Its average value is___________?

127.4 V

141.4 V

282.8 V

200V

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3.
The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?

180″

90°

60°

0°

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4.
For the same peak value which of the following wave will ‘have the highest r.m.s. value?

Square wave

Half wave rectified sine wave

Triangular wave

Sine wave

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5.
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

Both waves must have same frequency

Both waves must have identical peak values

Both waves must have zero value at the same time

None of the above

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6.
In a series resonant circuit, the impedance of the circuit is___________?

Minimum

Maximum

Zero

None of the above

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7.
Power factor of an electrical circuit is equal to____________?

R/Z

Cosine of phase angle difference be-tween current and voltage

KW/kVA

Ratio of useful current to total cur¬rent Iw/I

All of these

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8.
The best place to install a capacitor is___________?

Very near to inductive load

Across the terminals of the inductive load

Far away from the inductive load

Any where

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9.
All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?

Capacitance only

Inductance only

Resistance only

All above

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10.
Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?

Parallel

Series

Either A or b

None of the above

Parallel

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11.
Power factor of the following circuit will be unity

Inductance

Capacitance

Resistance

Both A. and B.

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12.
The double energy transient occur in the____________?

Purely inductive circuit

R-L circuit

R-C circuit

R-L-C circuit

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13.
A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.

100 n

50 jt

25 JT

5 n

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14.
The form factor is the ratio of_______?

Peak value to r.m.s. value

R.m.s. value to average value

Average value to r.m.s. value

None of the above

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15.
The period of a wave is___________?

The same as frequency

Time required to complete one cycle

Expressed in amperes

None of the above

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