In all electric machines, basic action taking place is
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Armature voltage control is suitable if d.c. machine is driven at constant
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All d.c. machines are characterized by
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A dc shunt motor is driving a constant torque load with rated excitation. If the field current is reduced to half, then the speed of the motor will become
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The armature current drawn by a dc motor is proportional to
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If the armature current of a dc motor is increased keeping the field flux constant, then the developed torque
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When an electric traian is moving down a hill the dc motor acts as
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The direction of rotation of a dc motor can be reversed by reversing the connection to
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In dc motor, the amount of flux leakage depends on
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In a compound dc motor, the shunt field winding as compared to series winding will have
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Frog leg winding is
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When the direction of power flow reverses, a differentially compounded motor becomes
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