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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -0.08
 1.92
 -1.92

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 slip speed.
 normal speed.
 any of the above.
 synchronous speed.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Small and constant load.
  Over-excitation.
  Over-loading for long period.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 None of above.
 Armature current.
 Field current.
 Line current.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  as wide as possible.
  depends on the material of stator and the rotor.
  air gap does not matter.

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Lenzs law.
 Amperes law.
 Flemings right hand rule.
  Flemings left hand rule.

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