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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
The power is measured in terms of decibels in case of

Auto transformers
Current transformers
Electronic equipment
Transformers

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AC Fundamentals, Circuit and Circuit Theory
Power factor of the system is kept high

To reduce voltage regulation of the line
All of the listed here
To reduce line losses
To maximize the utilization of the capacities of generators, lines and transformers

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

kVAR
kV
kW
kVA

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AC Fundamentals, Circuit and Circuit Theory
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?

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

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AC Fundamentals, Circuit and Circuit Theory
The transient currents are associated with the

Resistance of the circuit
Impedance of the circuit
Changes in the stored energy in the inductors and capacitors
Applied voltage to the circuit

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

Less than unity
Zero
Unity
Greater than unity

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