A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

38%

68%

60%

40%

38%

68%

60%

40%

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Electrical Machines
Slip exists in

synchronous motor.

none of above.

in both machines.

induction motor.

synchronous motor.

none of above.

in both machines.

induction motor.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

N1 : N2.

none.

N12 : N22.

1 : 1.

N1 : N2.

none.

N12 : N22.

1 : 1.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

32.

8.

16.

4.

32.

8.

16.

4.

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

percentage impedance of all transformers must be same.

polarities of all transformers must be same.

voltage ratio of all transformers must be same.

MVA rating of all transformer inversely proportional to impedance.

percentage impedance of all transformers must be same.

polarities of all transformers must be same.

voltage ratio of all transformers must be same.

MVA rating of all transformer inversely proportional to impedance.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

unity power factor.

any of the above.

leading power factor.

lagging power factor.

unity power factor.

any of the above.

leading power factor.

lagging power factor.

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Electrical Machines

Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines Slip exists in

Electrical Machines Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

Electrical Machines A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

Electrical Machines For satisfactory parallel operation of two transformers which of the following conditions is most essential,

Electrical Machines When excitation is increased (over excitation), the synchronous generator operates at

Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines
Slip exists in

Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at