DC Motors
Which of the following loss in a D.C. generator varies significantly with the load current?

Windage loss
Field copper loss
None of these
Armature copper loss

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DC Motors
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens

This will make armature to take heavy current, possibly burning it
Nothing will happen to the motor
Motor will run at very slow speed
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

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DC Motors
The speed of a dc motor is

inversely proportional to applied voltage
inversely proportional to flux per pole
Directly proportional to flux per pole
None of the listed here

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