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?

60%

38%

40%

68%

60%

38%

40%

68%

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

Zero

16.55 Nm

15.6 Nm

15.28 Nm

Zero

16.55 Nm

15.6 Nm

15.28 Nm

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Electrical Machines
Which of the following statements is/are correct ?

Compensating winding will act under the pole.

Both A and B.

Inter pole winding will act in interpolar region.

None of these

Compensating winding will act under the pole.

Both A and B.

Inter pole winding will act in interpolar region.

None of these

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

no resistance is connected.

parallel.

series.

any one of the connection.

no resistance is connected.

parallel.

series.

any one of the connection.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

V²

f²

f

V

V²

f²

f

V

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Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will

increase to a value greater than 1.25 times 220 V

increase to 1.25 times 220 V

not change and remain at 220 V

increase to value lying between 220 V and 1.25 times 220 V

increase to a value greater than 1.25 times 220 V

increase to 1.25 times 220 V

not change and remain at 220 V

increase to value lying between 220 V and 1.25 times 220 V

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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 A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

Electrical Machines Which of the following statements is/are correct ?

Electrical Machines If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

Electrical Machines In a transformer maximum flux density is not constant, the eddy current loss varies as

Electrical Machines A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will

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
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

Electrical Machines
Which of the following statements is/are correct ?

Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will