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
Skin effect
Increase in temperature
Iron loss in core

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces

The same heat as produced by A.C. when flowing through the same circuit
The more heat than produced by A.C. when flowing through the same circuit
The less heat than produced by A.C. flowing through the same circuit
None of these

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AC Fundamentals, Circuit and Circuit Theory
Time constant of a capacitive circuit

Increases with the decrease of capacitance and decrease of resistance
Increases with the decrease of capacitance and increase of resistance
Increase with increase of capacitance and increase of resistance
Increases with the increase of capacitance and decrease of resistance

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