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AC Fundamentals, Circuit and Circuit Theory

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 four times as high
Be doubled
Be reduced by half

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be

282.8 V
141.4 V
100 V
111 V

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AC Fundamentals, Circuit and Circuit Theory
Which of the following circuit component opposes the change in the circuit voltage ?

Capacitance
Conductance
Resistance
Inductance

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AC Fundamentals, Circuit and Circuit Theory
In a series L-C circuit at the resonant frequency the

Impedance is maximum
Voltage across C is minimum
Current is maximum
Current is minimum

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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

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

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

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

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