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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?

 1500 rpm
 zero
 1470 rpm
 30 rpm

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 sinusoidal.
 rectangular.
  triangular.
 trapezoidal.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running torque.
  ratio of starting to running current.
  ratio of input to output voltage.
  efficiency.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -2 < S < 2
 0 < S < 1
 0 < S < 2
 -1 < S < 1

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Synchronous motor.
  DC series motor.
  Single phase induction motor.
  AC slip ring motor.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the inductor.
 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the mass.

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