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AC Fundamentals, Circuit and Circuit Theory

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

40 kW
80 kW
36 kW
32 kW

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AC Fundamentals, Circuit and Circuit Theory
Power factor of the following circuit will be unity

None of the listed here
Resistance
Capacitance
Inductance

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AC Fundamentals, Circuit and Circuit Theory
The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohm. If frequency is increased to 100 Hz, reactance becomes __________ ohms.

5
10
25
15

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AC Fundamentals, Circuit and Circuit Theory
In a circuit containing R, L and C, power loss can take place in

Capacitance only
All of the listed here
Resistance only
Inductance only

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AC Fundamentals, Circuit and Circuit Theory
Wire-wound resistors are unsuitable for use at high frequencies because they

Are likely to melt under excessive eddy current heat
Exhibit unwanted inductive and capacitive effects
Create more electrical noise
Consume more power

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

kV
kW
kVAR
kVA

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