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If in a L-R series circuit the power factor is 1/2 and R=100Ω, then the value of L is, when AC mains is used
Options
(a) πH
(b) √3/π H
(c) π/√3 H
(d) √2/π H
Correct Answer:
√3/π H
Explanation:
power factor, cos ɸ = 1 / 2 ⇒ ɸ = 60°
Therefore, tan 60° = ωL / R ⇒ √3 = (2πv × L) / 100
L = [(√3 × 100) / (2π × 50)] = (√3 / π) H
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If an A.C. mains supply is given to be 220 V, what would be the average e.m.f.
- A meter stick of mass 400 g is pivoted at one end and displaced through an angle 60°.
- A nucleus of uranium decays at rest into nuclei of thrrium and helium. Then
- Which one of the following equations of motion represents simple harmonic motion?
- The momentum of a body is increased by 20%.The percentage increases in kinetic energy
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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