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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 1/√3
 3
 √3

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 3
 1, 4
 1, 3
 2, 4

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie under north pole.
 lie under south pole.
 there is no hard and fast rule for this.
 lie in the inter polar gaps.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  √Ia.
  Ia.
  Ia2.
  1/Ia.

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Electrical Machines
The polarity of a DC generator can be reversed by

 increasing field current.
 reversing the field current.
 any of above.
 reversing field electric current as well as direction of rotation.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  delta.
  delta or star according to need.
  star.

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