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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

  2 pole.
 6 pole.
 4 pole.
 8 pole.

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Electrical Machines
Which of the following is the largest conversion device?

All of these
 Induction machine
 Synchronous machine
 DC machine

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Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).
  Nr = 120f / p × (1-s).

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 any of the above
 parabola
 linearised

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  √Ia.
  Ia.
  1/Ia.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  continue running in the same direction as before.
  not run.
  run in a direction opposite to previous one.
  get damaged.

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