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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

60°
180°
90°
30°

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AC Fundamentals, Circuit and Circuit Theory
For a frequency of 200 Hz, the time period will be

0.5 s
0.005 s
0.05 s
0.0005 s

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

Zero
Less than unity
Unity
Greater than unity

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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

5 mA
9 mA
15 mA
4 mA

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AC Fundamentals, Circuit and Circuit Theory
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is

42.42 sin 314 t
60 sin 25 t
84.84 sin 3141
60 sin 50 t

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AC Fundamentals, Circuit and Circuit Theory
In an A.C. circuit power is dissipated in

Resistance only
Inductance only
None of the listed here
Capacitance only

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