46. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
47. Which of the following motors is usually used in household refrigerators?
48. Which D.C. motor is preferred for elevators?
49. During rheostatic braking of D.C. series motors
50. In a D.C. generator all of the following could be the effects of iron losses except
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