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DC Motors

DC Motors
In the dc motor the iron losses occur in

Brushes
Armature
Field
Commutator

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DC Motors
A series motor will over speed when

The field is opened
Load is removed
The armature circuit is opened.
The load is increase

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DC Motors
Ward-Leonard control is basically a

Field control method
Field divertor method
Armature resistance control method
Voltage control method

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DC Motors
A direct on line starter is used for starting motors

Upto 15 HP
Upto 10 HP
Upto 5 HP
Upto 20 HP

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DC Motors
Three point starter can be used for

Both shunt and compound motor
Compound motor only
Series motor only
Shunt motor only

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DC Motors
The iron loss in dc motor depends on

Both flux and speed
Flux only
None of the listed here
Speed only

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