| ⇦ | 
| ⇨ |
An electric motor operating on a 60 volt D.C supply draws a current of 10 amp. If the efficiency of the motor is 50%, the resistance of its windings is
Options
(a) 3 ohm
(b) 6 ohm
(c) 15 ohm
(d) 30 ohm
Correct Answer:
3 ohm
Explanation:
Efficiency n = 50 %
e = E/2 ⇒ I = (E – e) / R = [E – (E/2)] / RA = E / 2R
10 = 60 / 2R ⇒ R = 60 / (2 × 10) = 3 ohm
Related Questions: - The displacement ‘x’ (in meter) of a particle of mass ‘m’ (in kg) moving in one
- A slab consists of two parallel layers of two different materials of same thickness
- A hollow sphere of charge does not produce an electric field at any
- A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N
- During an adiabatic process, the cube of the pressure is found to be inversely
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The displacement ‘x’ (in meter) of a particle of mass ‘m’ (in kg) moving in one
- A slab consists of two parallel layers of two different materials of same thickness
- A hollow sphere of charge does not produce an electric field at any
- A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N
- During an adiabatic process, the cube of the pressure is found to be inversely
Topics: Current Electricity (136)
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