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DC Motors

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

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

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DC Motors
In dc machines fractional pitch winding is used

To improve cooling
To reduce the generated emf
To increase the generated emf
To reduce the sparking

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DC Motors
In a D.C. generator, the iron losses mainly take place in

Commutator
Yoke
Armature rotor
Armature conductors

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DC Motors
Which of the following law can be used to determine the direction of rotation of dc motor?

Faraday's law
Fleming's left hand rule
Lenz's law
Coloumb's law

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DC Motors
Differentially compound D.C. motors can find applications requiring

Variable speed
Frequent on-off cycles
Low starting torque
High starting torque

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DC Motors
Compensating winding in a dc machine is placed

On yoke in the interpolar gap
On armature
None of the listed here
On yoke in the pole faces

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