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%

60%

40%

68%

38%

60%

40%

68%

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

Increase by 5%.

Reduce by 5%.

Depends on other factor.

Remain unchanged.

Increase by 5%.

Reduce by 5%.

Depends on other factor.

Remain unchanged.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

commutator

armature winding

starters

field winding

commutator

armature winding

starters

field winding

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

V

V2

f2

f

V

V2

f2

f

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Electrical Machines
The constant losses in transformer is/are

hysteresis loss.

eddy current loss.

both 2 and 3.

copper loss.

hysteresis loss.

eddy current loss.

both 2 and 3.

copper loss.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

650 W

600 W

700 W

625 W

650 W

600 W

700 W

625 W

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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 If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

Electrical Machines DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

Electrical Machines When maximum flux density is constant, the eddy current losses are proportional to

Electrical Machines The constant losses in transformer is/are

Electrical Machines The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

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
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

Electrical Machines
The constant losses in transformer is/are

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be