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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

36 kW
40 kW
80 kW
32 kW

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AC Fundamentals, Circuit and Circuit Theory
In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will

Be reduced to one fourth
Be doubled
Be four times as high
Be reduced by half

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AC Fundamentals, Circuit and Circuit Theory
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of

Capacitive effect between adjacent coil turns
Increase in temperature
Iron loss in core
Skin effect

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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.

15
25
10
5

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AC Fundamentals, Circuit and Circuit Theory
The voltage of domestic supply is 220 V. This figure represents

Mean value
Average value
Peak value
R.m.s. value

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of pure cosine function is

Zero
0.5 of peak value
0.707 of peak value
Same as peak value

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