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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
- A beam of cathode rays is subjected to crossed Electric (E) and Magnetic fields (B)
- Weight of a body of mass m decreases by 1% when it is raised to height h
- Water flows through a pipe. The area of cross-section at one place A₁=10 cm²,
- If a star converts all helium in its core to oxygen, then energy released per oxygen
- The voltage gain of an amplifier with 9% negative feedback is 10.
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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