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DC Motors

DC Motors
Small dc motors up to 5 HP usually have

6 poles
2 poles
4 poles
8 poles

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DC Motors
The friction and windage losses in a dc motor depends upon

Armature current
Speed
Field and armature resistance
Flux

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DC Motors
Dc series motors are used in those applications where _____ is required.

None of the listed here
Constant speed
High starting torque
Low no load speed

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DC Motors
The plugging gives the

Highest torque braking
None of the listed here
Smallest torque braking
Zero torque braking

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DC Motors
The mechanical power developed by a shunt motor will be maximum when the ratio of back emf to applied voltage is

1.0
0.5
2.0
4.0

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DC Motors
The running speed of a dc series motor is basically determined by

Armature reaction
Field excitation
None of the listed here
Load

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