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DC Motors

DC Motors
In a dc motor constant torque is produced due to

Pole shoes
Rotor laminations
Commutator
End plates

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DC Motors
When two dc series motor are commected in parallel, the resultant speed is

More than the normal speed
Zero
Loss than the normal speed
Normal speed

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DC Motors
Which of the following methods gives the greatest braking torque?

None of the listed here
Rheostatic braking
Plugging
Regenerative braking

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DC Motors
D.C. series motors are used

None of these
Where constant operating speed is needed
Where load is constant
Where load changes frequently

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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
The maximum end play of a motor is about

6 mm
0.4 mm
10 mm
2 mm

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