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Electrical Machines

Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  maximum torque.
  electromagnetic torque.
  none.

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Electrical Machines
Hysteresis loss will depends on

 f1.6
 f³
 f²
 f

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Collecting of large current is simple.
 Insulation requirement is less.
All of these
 Operating cost is less.

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Electrical Machines
Equalizer rings are used in which of the followings?

 lap winding
None of these
 both 1 and 2
 wave winding

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 V
 f²
 V²

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 more and maximum torque remains constant
 less and maximum torque decreases
 more and maximum torque decreases

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