Electrical Machines
The type of DC motor generally used for shears and punches is

 Series motor.
 Shunt motor.
 Cummulative compound motor.
 Differential compound motor.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed demanding more armature current.
 decrease in speed but armature current remains the same.
 increase in speed but armature currnet remains the same.
 decrease in speed demanding less armature current.

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Electrical Machines
A belt-driven cumulatively-compound dc generator is delivering power to the dc mains. If the Belt snaps then the machine will run as a

 cumulative compounded motor in the same direction
 differentially compounded motor in the opposite direction
 differentially compounded motor in the same direction
 cumulative compounded motor in opposite direction

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