Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  DC series motor.
  AC slip ring motor.
  Synchronous motor.

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

 armature resistance, inter poles, armature.
  reduction in field current, effect of armature reaction, armature.
 armature resistance, effect of armature reaction.
  armature resistance, effect of armature reaction.

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 A is bigger than B for the same current rating
 B is bigger than A for the same current rating
 both are of the same size for the same current rating
 A is bigger than B for the same voltage rating

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