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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
- The sodium nucleus ₁₁Na²³ contains
- The fossil bone has a ¹⁴C:¹²C ratio, which is [1/16] of that in a living animal
- A body of weight W newton is at the surface of the earth.
- Three objects coloured black, gray and white can withstand hostile conditions upto 2800⁰C.
- A bar magnet of moment of inertia I is vibrated in a magnetic field of induction
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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