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DC Motors

DC Motors
The maximum end play of a motor is about

6 mm
0.4 mm
10 mm
2 mm

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DC Motors
The direction of rotation of a D.C. series motor can be changed by

None of these
Either of (A) and (B) above
Interchanging supply terminals
Interchanging field terminals

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

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

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

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

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DC Motors
These days dc motors are widely used in

Electric traction
Pumping sets
Air compressors
Machine shops

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DC Motors
In which of the following tests only one motor is required?

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

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