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The rms current in an AC circuit is 2 A. If the wattless current be √3 A, what is the power factor of the circuit?
Options
(a) (1/2)
(b) (1/3)
(c) 1/√3
(d) 1/√2
Correct Answer:
(1/2)
Explanation:
We know that, Iwʟ = I(rms) sin ɸ
⇒ √3 = 2 sin ɸ or, sin ɸ = √3 / 2 ⇒ ɸ = 60°
So, power factor = cos ɸ = cos 60° = 1 / 2
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If vectors A=cos wti + sin wtj and B= cos wt/2 i + sin wt/2 j are functions of time,
- The half-life period of a radio-active element X is same as the mean life time
- The displacement of a particle along the x-axis is given by x = a sin² ?t
- A solid sylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 ms⁻¹
- An electron moving in a circular orbit of radius r makes n rotations per second.
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Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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