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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 1
 4
 2

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.781 Ω.
 2.74 Ω.
 25.564 Ω.
  2.241 Ω.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 high efficiency.
  quick acceleration.
 reduced size.
 low starting torque.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  prevent hunting and provide the starting torque.
  reduce noise level only.
  provide starting torque only.
  reduce the eddy currents.

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 no load voltage and field current
 short circuit current and field current
 short circuit current and armature current

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 200%
 increase by 100%
 reduced to half
 remain unaltered

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