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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?

All of these
 RBY
 BRY
 BYR

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

  more than that of second transformer.
 less than that of second transformer.
 equal to that of second transformer.
 none of these.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 3
 2 alone
 1, 2 and 3
 1 and 2

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 reduced starting torque.
  a large starting torque.
 higher efficiency.
 low noise.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 interpole and compensating windings together
 field winding
 interpole winding

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 more than 30 W
 less than 30 W
 zero watt
 30 W

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