DC Motors
Which of the following losses are significantly reduced by laminating the core of a D.C. generator?

Eddy current losses
Hysteresis losses
Windage losses
Copper losses

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DC Motors
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens

Nothing will happen to motor
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
This will make armature to take heavy current, possibly burning it
Motor will come to stop

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DC Motors
In a dc compound machine,

Either can play dominant role
Shunt field winding plays dominant role
Both play equally dominant role
Series field winding plays dominant role

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