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Electrical Machines

Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 30°.
 0°.
 45°.
  75°.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 940 RPM
 920 RPM
 970 RPM
 960 RPM

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

  None of them.
  Series.
  Shunt.
  Compound.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 high resistance of carbon brushes.
  reactance voltage.
 presence of commutator.
 armature reaction.

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Electrical Machines
Which of the following is/are not a self starting motor?

 both 1 and 2
 1-phase induction motor
 3-phase induction motor
None of these

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 57.7%
 66.3%
 33.3%
 50%

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