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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 30 rpm
 1470 rpm
 1500 rpm

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Electrical Machines
DC machine is a

 both are correct.
 convection machine.
 none of above are correct.
 conduction machine.

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Electrical Machines
Alternator operates on the principle of

  electromagnetic induction.
  mutual induction.
  self or mutual induction.
  self induction.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 225 V.
 220 V.
 230 V.

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 25 Hz
 50 Hz
 0 Hz

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve starting torque.
  improve efficiency.
  improve power factor.
  reduce copper loss.

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