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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
Two waves of the same frequency have opposite phase when the phase angle between them is

0°
360°
180°
90°

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AC Fundamentals, Circuit and Circuit Theory
The ratio of active power to apparent power is known as factor.

Power
Load
Demand
Form

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AC Fundamentals, Circuit and Circuit Theory
The safest value of current the human body can carry for more than 3 second is

15 mA
5 mA
9 mA
4 mA

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AC Fundamentals, Circuit and Circuit Theory
What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?

180°
45°
30°
90°

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

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

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AC Fundamentals, Circuit and Circuit Theory
In the case of an unsymmetrical alternating current the average value must always be taken over

Unsymmetrical part of the wave form
The whole cycle
The quarter cycle
The half cycle

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