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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
 high viscosity.
 low BDV.
  low viscosity.

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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.
 Compound.
  Series.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.96
 1.06
 0.87
 0.95

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - star
 Delta - delta
 Star - delta

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 lagging power factor.
 unity power factor.
 any of the above.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 average value.
  maximum value.
 rms value.
 total value.

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