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Electrical Machines

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

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

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  crawling.
  cogging.
  resonance.
  harmonics.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 440 A.
 40 A.
 44 A.

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Electrical Machines
Lamination of transformer core is made of

 wrought iron.
 cast steel.
  cast iron.
  silicon steel.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 none of above.
 back emf is equal to twice of applied voltage.
 back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.

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

  Series.
  Compound.
  None of them.
  Shunt.

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