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Electrical Machines

Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  skewing.
  crawling.
  slip.
  cogging.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 heavily loaded and over excited
 lightly loaded and over excited
 heavily loaded and underexcited
 lightly loaded and underecited

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.3 kW, 9.3 kW.
 9.6 kW, 12 kW.
 5.7 kW, 8.7 kW.
  6.3 kW, 9.3 kW.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 reduce magnetising current and improve power factor
 increase pull out torque
 decrease starting torque
 improve starting torque

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 terminal voltage should be same.
 rating of generators should be same.
 polarities should be same.
 both A and B.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 1.8 9 Ω
 1.79 Ω
 3.1 Ω

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