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A 220 volts input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformers is 80%, the current drawn by the primary windings of the transformer is
Options
(a) 3.6 ampere
(b) 2.8 ampere
(c) 2.5 ampere
(d) 5.0 ampere
Correct Answer:
5.0 ampere
Explanation:
V₂ / V₁ = 0.8 I₁ / I₂
V₂I₂ / V₁I₁= 0.8
V₁ = 220 V, I₂ = 2.0 A, V₂ = 440 V
I₁ = V₂I₂ / V₁ x 10/8 = 440 x 2 x 10 / 220 x 8
= 5.0 A
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If threshold wevelength for sodium is 6800 Å, the work function will be
- Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
- A bimetallic strip consists of metals X and Y. It is mounted rigidly at the base as shown
- A heavy small sized sphere is suspended by a string of length l.The sphere rotates
- A choke is preferred to a resistance for limiting current in AC circuit because
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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