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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cos2δ
 cosδ
 sinδ

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 stray losses.
 copper losses.
 dielectric losses.
 core losses.

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 4, 5, 6
 2, 3, 6
 1, 2, 5
 3, 4, 5

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 zero or very low voltage supply.
 high filed circuit resistance.
 all of these.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Differential compound.
 Series.
  Shunt.
 Cummulative compound.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.443.
 0.649.
 0.512.
  0.573.

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MORE MCQ ON Electrical Machines

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