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

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AC Fundamentals, Circuit and Circuit Theory
In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value

Will change the maximum value of current at resonance
Will change the resonance frequency
Will increase the selectivity of the circuit
Will change the impedance at resonance frequency

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AC Fundamentals, Circuit and Circuit Theory
An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,

The current through the resistance is more
Both resistance and inductance carry equal currents
The current through the resistance is less
None of the listed here

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