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

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AC Fundamentals, Circuit and Circuit Theory
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

None of the listed here
Both waves must have identical peak values
Both waves must have zero value at the same time
Both waves must have same frequency

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AC Fundamentals, Circuit and Circuit Theory
Pure inductive circuit

Consumes some power on average
None of the listed here
Takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
Does not take power at all from a line

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