A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

36.36% increase

18.18% increase

36.36% increase

36.36% decrease

36.36% increase

18.18% increase

36.36% increase

36.36% decrease

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

will remain the same

will become leading

will become lagging

None of these

will remain the same

will become leading

will become lagging

None of these

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

throughout the air gap.

region under main pole.

interpole region.

None of these

throughout the air gap.

region under main pole.

interpole region.

None of these

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Electrical Machines
A 3 - ÃŽÂ¦, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 ÃŽÂ© rotor resistance and 0.3 ÃŽÂ© standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

0.78 ÃŽÂ©.

0.66 ÃŽÂ©.

0.45 ÃŽÂ©.

0.24 ÃŽÂ©.

0.78 ÃŽÂ©.

0.66 ÃŽÂ©.

0.45 ÃŽÂ©.

0.24 ÃŽÂ©.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

16/9.

4/3.

9/16.

3/4.

16/9.

4/3.

9/16.

3/4.

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Electrical Machines
The reduced air gap results in an increase

cost of operation.

breaking torque.

power factor.

starting torque.

cost of operation.

breaking torque.

power factor.

starting torque.

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Electrical Machines

Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

Electrical Machines Compensating winding are used to rectify the flux density waveform at

Electrical Machines A 3 - ÃŽÂ¦, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 ÃŽÂ© rotor resistance and 0.3 ÃŽÂ© standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

Electrical Machines A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

Electrical Machines The reduced air gap results in an increase

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

Electrical Machines
Compensating winding are used to rectify the flux density waveform at

Electrical Machines
A 3 - ÃŽÂ¦, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 ÃŽÂ© rotor resistance and 0.3 ÃŽÂ© standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

Electrical Machines
The reduced air gap results in an increase