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DC MOTORS

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

Cummulative compounded
Differentially compuonded
Shunt
Series

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DC Motors
A dc series motor is most suitable for

Punch presses
Cranes
Pump
Lathes

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DC Motors
Excessive sparking at brushes may be caused due to

Dirt on the commutator
Loose coupling
Misaligment of machine
Worn bearings

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DC Motors
Excessive motor vibration is caused by

Bent shaft
Too much brush tension
Worn bearings
Open armature coil

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DC Motors
The iron loss in dc motor depends on

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

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