If back emf of d.c. motor is doubled while its speed is also doubled, then torque developed by the machine will
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All electrical machines have poles with
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In case of a motor
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Current normally used to excite synchronous and d.c. generators is
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The back emf Vb of a dc motor
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In a dc motor if the brushes are given a backward shift, then
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The armature reaction in a dc motor is attributed to
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The current flowing in conductors of a dc motor is
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In a dc motor, the flux leakage coefficient is typically
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The flux is maximum in following unit of a dc motor
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In a dc machine prominent and noisy blue and green sparks indicate
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The back emf of a dc motor depends on
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