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

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-9 section-1

Each section contains 100 MCQs on A.C Fundamentals, Circuits and Circuit Theory .
81
When an alternating current passes through an ohmic resistance the electrical power converted into heat is
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Answer: Option B
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82
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of ________ degrees.
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Answer: Option C
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83
The purpose of a parallel circuit resonance is to magnify
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Answer: Option B
Solution:
In a parallel circuit resonance, the purpose is to magnify voltage.

Resonance in a parallel circuit occurs when the impedance of the circuit becomes purely resistive, causing the current to be magnified and the voltage across the circuit elements to be maximized.

Option A: Current. While resonance does affect current, the primary purpose is to magnify voltage.

Option B: Voltage. This is correct as resonance in a parallel circuit results in the amplification of voltage.

Option C: Power. While resonance can affect power, its primary purpose is not to magnify power but rather voltage.

Option D: Frequency. Resonance does not magnify frequency but occurs at a specific frequency where the impedance of the circuit is minimized.

Therefore, the correct answer is Option B: Voltage.
84
The safest value of current the human body can carry for more than 3 second is
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Answer: Option B
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85
In a highly capacitive circuit the
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Answer: Option C
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86
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,
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Answer: Option C
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87
Poor power factor
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Answer: Option D
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88
Form factor for a sine wave is
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Answer: Option C
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89
The frequency of domestic power supply in India is
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Answer: Option D
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90
Pure inductive circuit
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Answer: Option C
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