Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 3000 rpm.
 3600 rpm.
 500 rpm.
  600 rpm.

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  get heated and damaged.
  rotate in the same direction as before maintenance.
  rotate in direction opposite to that before maintenance.
  not start at all.

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Electrical Machines
The synchronous reactance( Xs) is the

 combined reactance due to armature reaction and leakage flux
 reactance due to armature reaction of the machine
 reactance either due to armature reaction or leakage flux
 reactance due to leakage flux

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