Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  4000 rpm.
  1500 rpm.
  3000 rpm.
  3600 rpm.

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

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