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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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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- What is the energy of He⁺ electron in first orbit?
- The threshold wavelength for photoelectric emission from a material is 4800 Å.
- The workdone in turning a magnet of magnetic moment M by an angle of 90⁰ from the magnetic
- In an NPN transistor the collector current is 24 mA. If 80% of the electrons
- The half-life period of a radio-active element X is same as the mean life time
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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