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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
Capacitors for power factor correction are rated in

kVA
kW
kVAR
kV

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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
60 sin 50 t
84.84 sin 3141

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AC Fundamentals, Circuit and Circuit Theory
In an AC. circuit, a low value of kVAR compared with kW indicates

High power factor
Unity power factor
Low efficiency
Maximum load current

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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

80 kW
36 kW
40 kW
32 kW

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AC Fundamentals, Circuit and Circuit Theory
In AC. circuits, laminated iron is invariably used in order to

Reduce eddy current loss
Increase heat radiation
Reduce circuit permeability
Make assembly cheap and easier

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AC Fundamentals, Circuit and Circuit Theory
At __________ frequencies the parallel R-L circuit behaves as purely resistive.

Very low
Very high
High
Low

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