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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
 1500 rpm
 30 rpm
 1470 rpm

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Electrical Machines
The stator frame in an induction motor is used to

  hold armature stamping in position.
  protect the whole machine.
  provide return path for the flux.
  ventilate the armature.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 127 A.
 240 A.
 173 A.

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Electrical Machines
Swinburne's test is applicable to

 DC Shunt motor.
 DC shunt and level Compound motor.
 DC series motor.
 DC compound motor.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 11%
 21%
 41%
 10%

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

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

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