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

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the field winding connection must be reversed
 field winding must be excited by low voltage dc supply
 the armature connection must be reversed
 the field winding must be replaced

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  both (A) and (B).
  are provided on the stator for improving power factor.
  consists of short-circuited copper bars embedded in the field pole faces.
  are provided in a synchronous motor to make it self starting.

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