Electrical Machines
A shaded pole single phase induction motor can be used for

 wet grinders
 personal computers as cooling fan
 food mixers
 tape recorders

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 3 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase
 1/2 times maximum value of flux due to any phase
 3/2 times maximum value of flux due to any phase

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Electrical Machines
Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is

 1, 3, 5
 1, 2, 6
 1, 4, 6
 1, 2, 5

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

  polarities of all transformers must be same.
 percentage impedance of all transformers must be same.
 voltage ratio of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.

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