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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Cast iron.
 Mild steel.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  equal to number of rotor slots.
  an integral multiple of number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Induced emf.
 Mechanical power.
 Can not be determined.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 90o.
 dependent upon the load.
 180o.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ φ/f
 E ∝ 1/(φf)
 E ∝ φf
 E ∝ f/φ

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 0.
 10 KW.
 8 KW.
  2 KW.

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MORE MCQ ON Electrical Machines

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