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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  None of them.
  Shunt.
  Series.

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Electrical Machines
Which of the following are variable losses?

 hysteresis loss
 armature copper loss
 eddy current loss
 shunt field copper loss

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Electrical Machines
Induction motor operation depends on

 rotating magnetic field.
 stationary magnetic field.
None of these
 either of these.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 16/9.
 3/4.
 4/3.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 60, 1440.
 50, 1500.
 1440, 1500.

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

  Series.
 Parallel.
 Compound.
 None of the options.

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