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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 1
 0 < S < 2
 -1 < S < 1
 -2 < S < 2

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

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

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Electrical Machines
In DC generator, brushes are always placed along

 geometrical neutral axis.
 load axis.
 armature axis.
  magnetic neutral axis.

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Electrical Machines
Synchronous condensers are used to

 improve starting torque
 reduce hunting
All of these
 improve the power factor

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  stainless steel.
  silicon steel.
  aluminium.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 301 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 11.4 A, secondary = 301 A
 primary = 602 A, secondary = 22.7 A

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