Complex AC MCQs
Practice free Complex AC multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 216 questions — no login required.
Question 2easy
Alternating voltages and currents are expressed in r.m.s. values because
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Question 5easy
Three parallel circuits take the following currents : = sin 3141; i2 = 30 sin (324t +7c/2); i3 = 25 sin (314t ? n/2) The expression for the resultant current is
Question 6easy
Each of the three coils generates an e.m.f. of 230 V. The e.m.f. of second leads that of the first by 120? and the third lags behind the first by the same angle. The resultant e.m.f. across the series combination of the coils is
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Question 7easy
In a pure resistive circuit, the instantaneous voltage and current are given by : v = 250 sin 3141 volts i = 10 sin 3141 amperes The peak power in the circuit is
Question 9easy
An alternating voltage v = Vm sin 0 is applied to a pure capacitive circuit. The current equation will be