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DC MOTORS

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

Armature reaction
None of the listed here
Load
Field excitation

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DC Motors
The shaft torque in a dc motor is less than total armature torque because of ______ in the motor.

Field losses
Iron and friction losses
Cu losses
None of the listed here

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DC Motors
In a dc motor, the brushes are shifted from the mechanical neutral plane in a direction opposite to the rotation to _____

Decrease speed
Produce flat characteristics
Increase speed
Reduce sparking

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DC Motors
A series motor will over speed when

The load is increase
Load is removed
The armature circuit is opened.
The field is opened

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DC Motors
The resistance of shunt field winding as compared to series field winding is

None of the listed here
Less
More
The same

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