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% decrease

36.36% increase

18.18% increase

36.36% decrease

36.36% increase

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

there is no hard and fast rule for this.

lie under south pole.

lie in the inter polar gaps.

lie under north pole.

there is no hard and fast rule for this.

lie under south pole.

lie in the inter polar gaps.

lie under north pole.

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

supply voltage and excitation current at constant load.

supply voltage and field current at constant excitation.

power factor and supply voltage during hunting.

power factor and DC excitation at constant load.

supply voltage and excitation current at constant load.

supply voltage and field current at constant excitation.

power factor and supply voltage during hunting.

power factor and DC excitation at constant load.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

be unpredictable.

decrease.

increase

remain the same.

be unpredictable.

decrease.

increase

remain the same.

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Electrical Machines
At stand still condition the value of slip is

0

1

infinite value

finite value

0

1

infinite value

finite value

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

reduces the saturation magnetization.

increases the electrical resistivity of iron.

None of these

increases the hysteresis loss.

reduces the saturation magnetization.

increases the electrical resistivity of iron.

None of these

increases the hysteresis loss.

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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 In DC generators, the brushes remain in contact with conductors which

Electrical Machines An inverted V curve of synchronous motor shows variation of

Electrical Machines In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

Electrical Machines At stand still condition the value of slip is

Electrical Machines Addition of 0.3 % to 4.5 % silicon to iron

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
In DC generators, the brushes remain in contact with conductors which

Electrical Machines
An inverted V curve of synchronous motor shows variation of

Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

Electrical Machines
At stand still condition the value of slip is

Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron