Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may not start.
 the motor may run away.
 the starting current will be enormously high.
 the starting torque becomes low.

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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

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

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