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A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
Options
(a) 50%
(b) 90%
(c) 10%
(d) 30%
Correct Answer:
90%
Explanation:
? = P output / P input x 100
= 100 / 220 x 0.5 = 90.9%
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- 3 persons are initially at the 3 corners of an equilateral triangle
- A particle is released from rest from a tower of height h, i.e,t₁ : t₂ : t₃ is
- Two charges each equal to 2µ C are 0.5m apart. If both of them exist inside vacuum
- A n-p-n transistor is connected in common emitter configuration in a given amplifier.
- The distance travelled by a particle starting from rest and moving
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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