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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 950 rpm
 850 rpm
 900 rpm
 1000 rpm

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

 triangular.
  sinusoidal.
  flat topped.
  pulsating.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  repulsion motor.
  asynchronous motor.
  transformer.

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.
None of these
 The leakage reactance of the induction motor should be small.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 180o.
 90o.
 dependent upon the load.
 0o.

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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%.

 960 RPM
 940 RPM
 970 RPM
 920 RPM

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