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DC Motors

DC Motors
Small dc motors up to 5 HP usually have

8 poles
2 poles
4 poles
6 poles

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DC Motors
No load speed of which of the following motor will be highest?

Shunt motor
Series motor
Cummulative compounded motor
Differentially compounded motor

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DC Motors
The armature torque of the D.C. shunt motor is proportional to

both (A) and (B)
None of these
armature current only
field flux only

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DC Motors
The greatest percentage of power loss in a dc motor is due to

Copper loss
Friction loss
Windage loss
Core loss

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DC Motors
These days dc motors are widely used in

Pumping sets
Air compressors
Machine shops
Electric traction

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DC Motors
The maximum end play of a motor is about

0.4 mm
6 mm
10 mm
2 mm

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