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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
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle
- In circular coil, when number of turns is doubled and resistance becomes 1/4th
- Photon of frequency ν has a momentum associated with it. If c is the velocity
- If a mass of 20g having charge 3.0 mC moving with velocity 20ms⁻¹ enters a region
- A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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