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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
  2 Hz.
  3 Hz.
 10 Hz.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The speed of motor will be reduced.
 The armature current will reduce.
 DC Shunt Motor
  The motor will attain dangerously high speed.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 23.06 kW.
 25 kW.
 26.21 kW.
 24.11 kW.

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature current
 armature flux
All of these
 armature mmf

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  too rapid reversal of current.
  under commutation.
 over commutation.
  any of the above.

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 72
 36
 74
 37

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