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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
All definitions of power factor of a series R-L-C circuit are correct except

Ratio of W and VA
Ratio of net reactance and impedance
Ratio of J and Z
Ratio of kW and kVA

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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

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

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AC Fundamentals, Circuit and Circuit Theory
In a purely inductive circuit

Reactive power is zero
None of the listed here
Actual power is zero
Apparent power is zero

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AC Fundamentals, Circuit and Circuit Theory
Magnitude of current at resonance in R-L-C circuit

Depends upon the magnitude of C
Depends upon the magnitude of L
Depends upon the magnitude of R
Depends upon the magnitude of R, Land C

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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
10
25
5

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AC Fundamentals, Circuit and Circuit Theory
The best place to install a capacitor is

Any of the listed here
Far away from the inductive load
Across the terminals of the inductive load
Very near to inductive load

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