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?

40%

60%

68%

38%

40%

60%

68%

38%

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a DC machine

emf in armature conductors and at the terminals is alternating.

current and emf in armature are alternating.

current and emf at the terminals are alternating.

current and emf in armature are unidirectional

emf in armature conductors and at the terminals is alternating.

current and emf in armature are alternating.

current and emf at the terminals are alternating.

current and emf in armature are unidirectional

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of the following rotor requires damper winding?

Cylindrical rotor.

None of these

Both type rotor.

Salient pole rotor.

Cylindrical rotor.

None of these

Both type rotor.

Salient pole rotor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Compensating windings is placed in which part of a D.C motor?

On yoke in the inter pole gap.

On yoke in the pole faces.

On armature.

None of these

On yoke in the inter pole gap.

On yoke in the pole faces.

On armature.

None of these

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of the following statement is true for an AC synchronous motor?

It is a variable speed motor.

It is a step angled motor.

It is a high reluctance motor.

It is a constant speed motor.

It is a variable speed motor.

It is a step angled motor.

It is a high reluctance motor.

It is a constant speed motor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
DC generator will not build up voltage

due to wrong direction of rotation.

if field resistance is more than critical resistance.

if it has lost residual magnetism.

any one of above.

due to wrong direction of rotation.

if field resistance is more than critical resistance.

if it has lost residual magnetism.

any one of above.

ANSWER DOWNLOAD EXAMIANS APP

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 In a DC machine

Electrical Machines Which of the following rotor requires damper winding?

Electrical Machines Compensating windings is placed in which part of a D.C motor?

Electrical Machines Which of the following statement is true for an AC synchronous motor?

Electrical Machines DC generator will not build up voltage

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
In a DC machine

Electrical Machines
Which of the following rotor requires damper winding?

Electrical Machines
Compensating windings is placed in which part of a D.C motor?

Electrical Machines
Which of the following statement is true for an AC synchronous motor?

Electrical Machines
DC generator will not build up voltage