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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
 RBY
 BRY
All of these

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Naphtha based insulating oil.
  Paraffin based insulating oil.
 Aromatics based insulating oil.
 Olefin based insulating oil.

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Electrical Machines
The constant losses in transformer is/are

 eddy current loss.
 both 2 and 3.
 hysteresis loss.
 copper loss.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I/2 and P/4
 V, I and P
 V, I/2 and P/2
 V/2, I and P/2

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Electrical Machines
Induction motors have the advantage of

  less maintenance.
  all of below.
  less cost.
  simple in construction.

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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
 3, 4, 5
 1, 2, 5

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