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DC MOTORS

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

Series
Differentially compuonded
Shunt
Cummulative compounded

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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

Loose coupling
Worn bearings
Misaligment of machine
Dirt on the commutator

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DC Motors
Excessive motor vibration is caused by

Bent shaft
Open armature coil
Too much brush tension
Worn bearings

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DC Motors
The iron loss in dc motor depends on

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

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