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DC Motors

DC Motors
A dc series motor is most suitable for

Cranes
Lathes
Punch presses
Pump

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DC Motors
Excessive motor vibration is caused by

Open armature coil
Worn bearings
Bent shaft
Too much brush tension

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DC Motors
Carbon brushes are preferable to copper brushes because _____

They reduce armature reaction
They reduce sparking
They have longer life
They have lower resistance

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DC Motors
A dc motor is still used in industrial applications because it

Is simple in construction
None of the listed here
Is cheap
Provides fine speed control

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DC Motors
For the same H.P. rating and full load speed, following motor has poor starting torque

Cumulatively compounded
Series
Shunt
Differentially compounded

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DC Motors
In the dc motor the iron losses occur in

Commutator
Armature
Brushes
Field

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