Excessive motor vibration is caused by
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A DC shunt motor is running at 1200 RPM when excited with 220 V dc. Neglecting the losses and voltage drop of the motor when connected to a 175 V supply is
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Excessive sparking at the brushes may be caused due to
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The greatest percentage of power loss in a d.c. motor is due to ………………..
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A motor takes a large current at starting because
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The iron losses in a d.c. motor depends upon ………………..
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The various losses in a d.c. the machine, whether it is a motor or a generator, is categorized amplified into three groups as
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……………….. motor is most suitable for punch presses
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A cumulatively compounded motor does not run at dangerous speed at light loads because of the presence of
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The friction and windage losses in a d.c. motor depends upon ………………..
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……………….. motors never use belt-connected loads
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Q. A 220 V, 15 kW, 1000 RPM shunt Motor with an armature resistance of 0.25Ω, has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 RPM while drawing a line current of 52.8 A and a field current of 1.8 A is ...
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