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DC Motors

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

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

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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 support the field coils
To reduce the reluctance of the magnetic path
To reduce eddy current loss

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DC Motors
Which of the following loss in a D.C. generator varies significantly with the load current?

Field copper loss
None of these
Windage loss
Armature copper loss

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DC Motors
Which motor should be used for centrifugal pumps?

Series motor
Either series or shunt
Shunt motor
None of the listed here

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DC Motors
Which motor has the poorest speed control?

Differentially compounded motor
Shunt motor
Cummulative compounded motor
Series motor

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DC Motors
The dirction of rotation of a dc series motor can be changed by

None of the listed here
Interchanging supply terminals
Either of Interchanging field or Interchanging supply
Interchanging field terminals

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