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Electrical Machines

Electrical Machines
The output voltage of a DC generator is

  E = V + IaRa.
 E = V + Ra.
 E = V + Ia.
 E = V – IaRa.

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
 is always unity.
  depends on the power factor of the load.
 is always lagging.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie under north pole.
 there is no hard and fast rule for this.
 lie in the inter polar gaps.
 lie under south pole.

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Electrical Machines
Universal motors are used in

 food processing
 cranes
All of these
 traction

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Electrical Machines
Which type of motors are used for lathes?

 DC shunt motors.
 Either A or B.
 Cage induction motor.
 Synchronous motor.

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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?

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

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