| ⇦ | 
| ⇨ |
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%
Related Questions: - Assertion(A) :The change in kinetic energy of a particle is equal to the work done
- A block of wood weighs 10 N and is resting on an inclined plane. The coefficient
- A total charge of 5µC is distributed uniformly on the surface of the thin walled
- A beam of light of wavelength 590 nm is focussed by a converging lens of diameter
- Before using the tangent galvanometer, its coil is set in
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Assertion(A) :The change in kinetic energy of a particle is equal to the work done
- A block of wood weighs 10 N and is resting on an inclined plane. The coefficient
- A total charge of 5µC is distributed uniformly on the surface of the thin walled
- A beam of light of wavelength 590 nm is focussed by a converging lens of diameter
- Before using the tangent galvanometer, its coil is set in
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply