A.C Fundamentals, Circuits And Circuit Theory MCQ Questions & Answers

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Learn A.C Fundamentals, Circuits And Circuit Theory MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. A.C Fundamentals, Circuits And Circuit Theory MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-8 section-1

Each section contains 100 MCQs on A.C Fundamentals, Circuits and Circuit Theory .

The peak value of a sine wave is 200 V. Its average value is

A) 127.4 V B) 141.4 V C) 282.8 V D) 200 V

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

The product of apparent power and cosine of the phase angle between circuit voltage and current is

A) True power B) Reactive power C) Volt-amperes D) Instantaneous power

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which of the following waves has the highest value of peak factor ?

A) Square wave B) Sine wave C) Half wave rectified sine wave D) Triangular wave

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

In a purely inductive circuit

A) Actual power is zero B) Reactive power is zero C) Apparent power is zero D) None of above is zero

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Pure inductive circuit takes power from the A.C. line when

A) Applied voltage decreases but current increases B) Applied voltage increases but current decreases C) Both applied voltage and current increase D) Both applied voltage and current decrease

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohms. If frequency is increased to 100 Hz, reactance becomes __________ ohms.

A) 2.5 B) 5 C) 10 D) 15

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Time constant of a circuit is the time in seconds taken after the application of voltage to each

A) 25% of maximum value B) 50% of maximum value C) 63% of maximum value D) 90% of the maximum value

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Magnitude of current at resonance in R-L-C circuit

A) Depends upon the magnitude of R B) Depends upon the magnitude of L C) Depends upon the magnitude of C D) Depends upon the magnitude of R, Land C

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Inductance of a coil Varies

A) Directly as the cross-sectional area of magnetic core B) Directly as square of number of turns C) Inversely as the length of the iron path D) All of above

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Two waves of the same frequency have opposite phase when the phase angle between them is

A) 360° B) 180° C) 90° D) 0°

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

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A.C Fundamentals, Circuits And Circuit Theory MCQ Questions & Answers | Electrical Engineering