The back emf of dc motor depends on
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Which of the following dc motor has approximately constant speed?
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If 220 V dc series motor is connected to a 220 V ac supply, then at will
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A dc motor is preferred to an ac motor for the application in
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The highest speed attained by a dc shunt motor at rated flux is
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The speed of a dc motor is
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Speed of a motor may be varied by varying
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When load is removed, which of the following dc motors will run at excessively high speed?
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A large series motor is never started without some load on it, otherwise
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The value of diverter resistance for a series dc motor is of the order of
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In a dc motor, the ratio of back emf to supply emf is an indication of its
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In a dc motor, pole shoes are fixed to the magnet core by
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