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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
The power consumed in a circuit element will be least when the phase difference between the current and voltage is

90°
60°
180°
30°

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AC Fundamentals, Circuit and Circuit Theory
Power factor of an inductive circuit is usually improved by connecting capacitor to it in

Parallel
Series
None of the listed here
Both parallel and series

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AC Fundamentals, Circuit and Circuit Theory
For a sine wave with peak value Imax the r.m.s. value is

0.9
0.5 Imax
1.414 Imax
0.707

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AC Fundamentals, Circuit and Circuit Theory
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is

36 kW
32 kW
40 kW
80 kW

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AC Fundamentals, Circuit and Circuit Theory
The power factor of a D.C. circuit is always

Greater than unity
Less than unity
Zero
Unity

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AC Fundamentals, Circuit and Circuit Theory
The inductance of a coil can be increased by

Increasing core length
Decreasing the diameter of the former
Decreasing the number of turns
Choosing core material having high relative permeability

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MORE MCQ ON AC Fundamentals, Circuit and Circuit Theory

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