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DC Motors

DC Motors
In the dc motor the iron losses occur in

Commutator
Brushes
Field
Armature

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DC Motors
The mechanical power developed by a shunt motor will be maximum when the ratio of back emf to applied voltage is

0.5
1.0
2.0
4.0

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DC Motors
Usually wide and sensitive speed control is desired in case of

Steel rolling mills
Elevators
Centrifugal pumps
Colliery winders

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DC Motors
Which one of the following is not the function of pole shoes in a D.C. machine?

To spread out flux for better uniformity
To reduce eddy current loss
To support the field coils
To reduce the reluctance of the magnetic path

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DC Motors
If a dc motor is comnected across the AC supply it will

Not run
Run at lower speed
Run at normal speed
Burn due to heat produced in the field winding by eddy currents

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DC Motors
If a dc motor is to be selected for conveyors, which motor would be preferred?

Shunt motor
Differentially compound motor
Series motor
Cummulative compound motor

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