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The voltage of an a.c.supply varies with time (t) as V=120 sin 100 πt cos 100 πt the maximum voltage and frequency are respectively
Options
(a) 120 V and 100 Hz
(b) 120√2 v and 100 Hz
(c) 60 V and 200 Hz
(d) 60 V and 100 Hz
Correct Answer:
60 V and 100 Hz
Explanation:
V = 120 sin 100 πt cos 100 πt
= 60 × 2 sin 100 πt cos 100 πt
= 60 × sin 200 πt
V(max) = 60 V
ω = 200 π
⇒ 2πf = 200 π
⇒ f = 100 Hz
⇒ 60 V and 100 Hz
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In a given process on an ideal gas, dW=0 and dQ<0. Then for the gas
- If t₁ ̷ ₂ is the half-life of a substance, then t₃ ̷ ₄ is the time in which
- The mass of a lift is 2000kg. When the tension in the supporting cable is 28000N, then its acceleration is
- The nuclear radius of a certain nucleus is 7.2 fm and it has a charge of 1.28×10⁻¹⁷ C.
- The excitation potential of hydrogen atom in the first excited state is
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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