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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 72°
 36°
 18°

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  zig - zag connection.
  star connection.
  V connection.
  delta connection.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 V²
 f²
 V

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to half the applied voltage.
 None of above.
 Back emf is equal to zero.
 Back emf is equal to applied voltage.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
  0.54.
 0.7.

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 field winding will burn.
 machine will generate maximum voltage.
 machine will generate maximum power.
 the voltage generated will be zero.

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