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DC MOTORS

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

Colliery winders
Steel rolling mills
Elevators
Centrifugal pumps

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

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

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DC Motors
Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?

Swinburne's test
Field test
Brake test
Hopkinson's test

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DC Motors
When the armature of a D.C. motor rotates, e.m.f. induced is

Mutually induced e.m.f.
None of these
Self-induced e.m.f.
Back e.m.f.

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DC Motors
A three point starter is considered suitable for

Shunt motors
Shunt, compound and series motors
Shunt as well as compound motors
All D.C. motors

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