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DC MOTORS

DC Motors
The most suitable motor for elevators is the ____ motor.

Shunt
Series
Cummulative compounded
Differentially compuonded

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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
Excessive sparking at brushes may be caused due to

Dirt on the commutator
Loose coupling
Worn bearings
Misaligment of machine

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DC Motors
Excessive motor vibration is caused by

Bent shaft
Open armature coil
Worn bearings
Too much brush tension

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DC Motors
The iron loss in dc motor depends on

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

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