The back emf of a dc motor
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A dc motor can be easily identified by
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The resistance of the starter of a 220 v, 5 HP dc shunt motor is of the order of
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Small dc motors upto 5 HP usually have
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Interpoles in dc motors are used for
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Carbon brushes are used in electric motors to
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In a dc series motor, the shaft torque is less than the armature torque due to
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Which of the following dc motors will have least percentage increase in input current for a given percentage increase in torque?
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For a dc motor operating under condition of maximum transfer of power, the efficiency of the motor is
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The speed of a dc shunt motor is required be more than full load speed. This may be achieved by
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If the field circuit of a loaded shunt motor s suddenly opened
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If the load current and flux of a dc motor are held constant and voltage applied across are held constant and voltage applied across its armature is increased by 10 per cent, its speed will
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