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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Mild steel.
 Cast iron.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 100 V.
 400 V.
 800 V.
 200 V.

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Electrical Machines
Lamination of transformer core is made of

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

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  1960 Watt.
 1800 Watt.
 1920 Watt.
  980 Watt.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  power factor.
  magnetizing current.
  speed.
  air gap flux.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
 rate of change of flux is minimum.
  rate of change of flux is maximum.
 shaft rotation is high.

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