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%

38%

60%

68%

40%

38%

60%

68%

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

15.9 Ω

31.9 Ω

15.1 Ω

31.1 Ω

15.9 Ω

31.9 Ω

15.1 Ω

31.1 Ω

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

-3%

-3.33%

+3.33%

+3%

-3%

-3.33%

+3.33%

+3%

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

high and high

low and high

low and low

high and low

high and high

low and high

low and low

high and low

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The direction of rotation of a DC motor can be determined by

Fleming's right hand rule.

Lenz's law.

Fleming's left hand rule.

Ampere's law.

Fleming's right hand rule.

Lenz's law.

Fleming's left hand rule.

Ampere's law.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
What does the use the of height flux density value in transformer design lead to?

Reduced copper loss.

Decrease in weight/KVA.

Increase in weight/KVA.

Reduced iron loss.

Reduced copper loss.

Decrease in weight/KVA.

Increase in weight/KVA.

Reduced iron loss.

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 An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

Electrical Machines For a dc machine shunt resistance and armature resistance values are

Electrical Machines The direction of rotation of a DC motor can be determined by

Electrical Machines What does the use the of height flux density value in transformer design lead to?

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
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

Electrical Machines
The direction of rotation of a DC motor can be determined by

Electrical Machines
What does the use the of height flux density value in transformer design lead to?