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DC Motors

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

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

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DC Motors
A dc series motor is best suited for driving

Cranes and hoists
Machine tools
None of the listed here
Shear and punches

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DC Motors
The variable resistor shunting the field of a dc series motor is called a

Field divertor
Potential divider
Armature divertor
Voltage regulator

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DC Motors
For the same H.P. rating and full load speed, following motor has poor starting torque

Shunt
Differentially compounded
Series
Cumulatively compounded

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DC Motors
Excessive sparking at brushes may be caused due to

Dirt on the commutator
Worn bearings
Misaligment of machine
Loose coupling

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DC Motors
D.C. generators are normally designed for maximum efficiency around

Rated r.p.m.
All of these
Full load
Rated voltage

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MORE MCQ ON DC Motors

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