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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
  1.5 to 2.
 3 to 5.
 1.0.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V
 f
 V²

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 shaded, unshaded
 unshaded, shaded
 unshaded, unshaded
 shaded, shaded

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  series connected.
 shunt connected.
  deferentially compounded.
  cumulatively compounded.

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Ball bearings.
  Bush bearings.
None of these
  Cast iron bearings.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Armature control.
 Multiple voltage control.
 Ward-Leonard control.
 Field control.

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