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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
- Hydrogen atom in ground state is excited by a monochrmatic radiation of λ=975 Å
- A particle of masses m is thrown upwards from the surface of the earth, with a velocity u
- Which logic gate is represented by the following combination of logic gate?
- A small oil drop of mass 10⁻⁶kg is hanging in at rest between two plates seperated
- The operation of a nuclear reactor is said to be critical, if the multiplication
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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