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DC Motors

DC Motors
The maximum end play of a motor is about

6 mm
2 mm
0.4 mm
10 mm

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DC Motors
Excessive sparking at brushes may be caused due to

Misaligment of machine
Dirt on the commutator
Worn bearings
Loose coupling

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DC Motors
In a D.C. generator, the iron losses mainly take place in

Commutator
Armature conductors
Armature rotor
Yoke

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DC Motors
The commutating pole winding is connected in

Series with the armature
Parallel with the armature
Series-parallel with the armature
None of the listed here

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DC Motors
If a dc motor is comnected across the AC supply it will

Burn due to heat produced in the field winding by eddy currents
Run at lower speed
Not run
Run at normal speed

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DC Motors
One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven

Runs as a generator
None of these
Does not run as a generator
Also runs as a motor comes to stop after sometime

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