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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 60°
 30°
 18°

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Electrical Machines
No load saturation characteristics are plotted between

 short circuit current and field current
 short circuit current and armature current
 no load voltage and armature current
 no load voltage and field current

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

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

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 lagging power factor
 leading power factor
 unity power factor
All of these

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Electrical Machines
Use of fractional pitch winding

  results in reduced leakage reactance.
  make it stiffer.
  results in reduced axial length of the machine.
All of these

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 none of these.
 less than that of second transformer.
  more than that of second transformer.
 equal to that of second transformer.

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