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DC Motors

DC Motors
In a dc motor constant torque is produced due to

Commutator
Pole shoes
Rotor laminations
End plates

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DC Motors
In the dc motor the iron losses occur in

Armature
Field
Brushes
Commutator

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DC Motors
The greatest percentage of power loss in a dc motor is due to

Core loss
Windage loss
Friction loss
Copper loss

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DC Motors
A dc series motor is most suitable for

Cranes
Lathes
Pump
Punch presses

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DC Motors
Dc shunt motors are used for driving

Hoist
Cranes
Machine tools
Trains

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DC Motors
In a dc machines the residual magnetism is of the order of

50 to 75 percent
2 to 3 percent
20 to 25 percent
10 to 15 percent

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