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%

68%

60%

38%

40%

68%

60%

38%

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

23.06 kW.

25 kW.

26.21 kW.

24.11 kW.

23.06 kW.

25 kW.

26.21 kW.

24.11 kW.

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Electrical Machines
Commutator in DC generator is used for

convert AC armature current in to DC

collecting of current

reduce losses

increase efficiency

convert AC armature current in to DC

collecting of current

reduce losses

increase efficiency

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

Change of supply frequency.

Change of supply voltage.

Change of number of pole.

Change of rotor resistance.

Change of supply frequency.

Change of supply voltage.

Change of number of pole.

Change of rotor resistance.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

both 2 and 3

supply frequency

load current

maximum flux density

both 2 and 3

supply frequency

load current

maximum flux density

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current IÃŽÂ¼ and Iw respectively, then

I1 = KI2 + Iw.

I1 = KI2 + Iw + IÃŽÂ¼.ok

I1 = KI2 + IÃŽÂ¼.

I1 = KI2.

I1 = KI2 + Iw.

I1 = KI2 + Iw + IÃŽÂ¼.ok

I1 = KI2 + IÃŽÂ¼.

I1 = KI2.

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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 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

Electrical Machines Commutator in DC generator is used for

Electrical Machines Which of the following methods of speed control is not affected through stator side?

Electrical Machines In a transformer, hysteresis and eddy current losses depend upon

Electrical Machines If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current IÃŽÂ¼ and Iw respectively, then

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 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

Electrical Machines
Commutator in DC generator is used for

Electrical Machines
Which of the following methods of speed control is not affected through stator side?

Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current IÃŽÂ¼ and Iw respectively, then