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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 Young’s double silt experiment, 12 fringes are observed to be formed
- A charged particle with a velocity 2×10³ ms⁻¹ passes undeflected through electric field
- A particle is executing a simple harmonic motion. Its maximum acceleration
- If the half-life of a material is 10 yr, then in what time, it becomes 1/4th part
- An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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