Under constant load condition, the speed of a dc motor is effected by
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The brush voltage drops in dc in / of the order of
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A dc shunt motor has external resistance R1 in the field circuit and resistance R2 in the armature circuit. The starting armature current for the motor will be minimum when
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If the supply voltage to a shunt motor is increased by 25%, which of the following will decrease?
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In a dc machine dull yellow spark indicates
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The output power of any electrical motor is taken from
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Which of the following dc motors has the least reduction in speed from no load to rated load?
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By putting a variable resistance (diverter) across the series field in a dc series motor, speed above normal can be obtained because
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Two dc series motors connected in series are driving the same mechanical load. If now the motors are connected in parallel, the speed becomes
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In a dc shunt motor, field excitation is kept at maximum value during starting to
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A dc shunt motor is driving a mechanical load at rated voltage and rated excitation. If the load torque becomes double, then the speed of the motor
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What is the standard direction of a motor?
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