A.C Fundamentals, Circuits and Circuit Theory MCQs
Practice free A.C Fundamentals, Circuits and Circuit Theory 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 109 questions — no login required.
Question 55hard
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
Question 56hard
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?
Question 57hard
The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is
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Question 58hard
What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?
Question 59hard
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of
Question 60medium
Power factor of an inductive circuit is usually improved by connecting capacitor to it in
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Question 61hard
In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of
Question 62medium
Which of the following circuit component opposes the change in the circuit voltage ?
Question 63hard
For the same peak value, which of the following wave has the least mean value?