| ⇦ | 
| ⇨ |
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: - When a ball is thrown up vertically with velocity vₒ,it reaches a maximum height
- Penetrating power of X-rays does not depend on
- The average power dissipated in a pure inductor is
- If alternating source of primary coil on transformer is replaced by a Laclanche cell
- In circular coil, when number of turns is doubled and resistance becomes 1/4th
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When a ball is thrown up vertically with velocity vₒ,it reaches a maximum height
- Penetrating power of X-rays does not depend on
- The average power dissipated in a pure inductor is
- If alternating source of primary coil on transformer is replaced by a Laclanche cell
- In circular coil, when number of turns is doubled and resistance becomes 1/4th
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