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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
- An automobile moves on a road with a speed of 54 km h⁻¹. The radius of its wheels
- The self-inductance of a choke coil is 10 mH. When it is connected with a 10 V DC source,
- The half life of radium is about 1600 year. Of 100 gram of radium existing now
- A thin semicircular conducting ring (PQR) of radius r is falling with its plane
- If A=4i+4j+4k and b=3i+j+4k, then angle between vectors A and B is
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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