Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both decrease
 increase and decrease respectively
 both increase
 decrease and increase respectively

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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Connecting an additional resistance in the armature circuit.
 Connecting an additional resistance in the field circuit.
 Connecting an additional resistance in stator circuit.
 Any of the above.

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

  decreases in both generators and the motors with load.
 increases in generators but decreases in motor with load.
 decreases in generators and increases in motor with load.
 increases in both the generators and the motors with load.

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