Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  crawling.
  relative speed.
  air gap.
  cogging.

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

 armature winding has thin leads whereas field winding has thick leads
 both the windings have thick leads
 armature winding has thick leads whereas field winding has thin leads
 both the windings have thin leads

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