| ⇦ | 
| ⇨ |
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: - Rutherford’s ∝ particle experiment showed that the atoms have
- The drift velocity of free electrons in a conductor is v, when a current
- Magnetic flux φ (in weber) linked with a closed circuit of resistance 10 Ω varies
- A tangent galvanometer has a coil of 50 turns and a radius of 20 cm. The horizontal
- A charge Q is uniformly distributed over a large plastic plate. The electric field
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Rutherford’s ∝ particle experiment showed that the atoms have
- The drift velocity of free electrons in a conductor is v, when a current
- Magnetic flux φ (in weber) linked with a closed circuit of resistance 10 Ω varies
- A tangent galvanometer has a coil of 50 turns and a radius of 20 cm. The horizontal
- A charge Q is uniformly distributed over a large plastic plate. The electric field
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