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?

68%

38%

60%

40%

68%

38%

60%

40%

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Electrical Machines
Which of the following machine will have maximum efficiency?

Induction motor.

DC motor.

Electrical power generator.

Electrical power transformer.

Induction motor.

DC motor.

Electrical power generator.

Electrical power transformer.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

θelec = θmech

θelec = 2/P*θmech

θelec = 4/P*θmech

θelec = P/2*θmech

θelec = θmech

θelec = 2/P*θmech

θelec = 4/P*θmech

θelec = P/2*θmech

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Electrical Machines
Compensating windings are used in DC generators

to neutralize the cross magnetizing effect of the armature reaction.

None of these

mainly to reduce the eddy currents by providing local short circuit.

to provide path for the circulation of cooling air.

to neutralize the cross magnetizing effect of the armature reaction.

None of these

mainly to reduce the eddy currents by providing local short circuit.

to provide path for the circulation of cooling air.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

number of turns in coil.

frequency of waveform.

flux per pole.

All of these

number of turns in coil.

frequency of waveform.

flux per pole.

All of these

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

None of these

dynamically induced voltage.

reactance voltage.

statically induced voltage.

None of these

dynamically induced voltage.

reactance voltage.

statically induced voltage.

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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 Which of the following machine will have maximum efficiency?

Electrical Machines For P pole machine relation between electrical degrees and mechanical degrees is

Electrical Machines Compensating windings are used in DC generators

Electrical Machines In an alternator the voltage generated per phase is proportional to

Electrical Machines The self induced emf in the coil undergoing commutation is called the

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
Which of the following machine will have maximum efficiency?

Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

Electrical Machines
Compensating windings are used in DC generators

Electrical Machines
In an alternator the voltage generated per phase is proportional to

Electrical Machines
The self induced emf in the coil undergoing commutation is called the