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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less cost.
  all of below.
  simple in construction.
  less maintenance.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 None of the options.
 Parallel.
  Series.
 Compound.

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Electrical Machines
The constant losses in transformer is/are

 copper loss.
 hysteresis loss.
 both 2 and 3.
 eddy current loss.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 economise on the material required for interpoles and their windings
 reduce the overall weight
 increase the acceleration of commutation
 reduce the saturation in the interpole

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Induced emf.
 Mechanical power.
 Can not be determined.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and load
 supply voltage, frequency and load
 supply voltage and frequency
 supply voltage

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