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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?

 18°
 60°
 30°
 20°

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 core loses only.
  copper losses.
 eddy current loss.
 hysteresis loss.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both armature current Ia and speed ωm increase
 Ia remains constant but ωm increase
 Ia increases and ωm decreses
 both decrese

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  uneven air gap.
  poor lubrication.
  overheating of winding.
  overload.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 234 V
 240 V
 474 V
 6 V

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Electrical Machines
Short circuiting is caused in the armature winding due to

 failure of insulation between two commutator bars.
  grounding of two or more turns of the same coil.
  any of above.
  failure of insulation between two turns of coil.

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