The armature voltage control of D.C. motor provides
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Usually wide and sensitive speed control is desired in case of
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The armature torque of the D.C. shunt motor is proportional to
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Which of the following method of speed control of D.C. machine will offer minimum efficiency ?
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As -the load is increased the speed of D.C. shunt motor will
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Which of the following motor has the poorest speed regulation ?
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Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of
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In a differentially compounded D.C. motor, if shunt field suddenly opens
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Following motor is used where high starting torque and wide speed range control is required.
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Speed control by Ward Leonard method gives uniform speed variation
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Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be
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Sparking, is discouraged in a D.C. motor because
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