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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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- The ultimate individual unit of magnetism in any magnet is called
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- The current gain of a transistor in common base configuration is 0.96.
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Avalanche breakdown is due to
- The ultimate individual unit of magnetism in any magnet is called
- Two spherical bodies of mass M and 5 M and radii R and 2 R released in free space
- The current gain of a transistor in common base configuration is 0.96.
- A linear aperture whose width is 0.02 cm is placed immediately in front of a lens
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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