| ⇦ | 
| ⇨ |
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: - A point charge q is placed at a distance x/2 directly above the centre of a cube
- Velocities of sound measured in hydrogen and oxygen gas at a given temperature
- A thin circular ring of mass M and radius R rotates about an axis through its centre
- Bragg’s law for X-rays is
- A ray of light passes from a medium A having refractive index 1.6 to the medium
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A point charge q is placed at a distance x/2 directly above the centre of a cube
- Velocities of sound measured in hydrogen and oxygen gas at a given temperature
- A thin circular ring of mass M and radius R rotates about an axis through its centre
- Bragg’s law for X-rays is
- A ray of light passes from a medium A having refractive index 1.6 to the medium
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