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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
 3
 1/3
 √3

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Electrical Machines
Slip test is performed to determine

 positive sequence reactance and negative sequence reactance
 direct axis reactance and quadrature axis reactance
All of these
 slip

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Both 1and 2
 Terminal voltage is same
 Frequency should be same
 Speed of alternators should be same

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 As a separate unit.
 In parallel with the field winding.
 In parallel with the armature winding.

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
All of these
 Iron loss
 Copper loss

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.

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