A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

0.25.

0.72.

1.24.

0.62.

0.25.

0.72.

1.24.

0.62.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

None of these

compensate for the decrease in speed due to increase of load.

neutralize voltage induced in coil due to fluctuation of l

reduce eddy current losses by providing local short circuits.

None of these

compensate for the decrease in speed due to increase of load.

neutralize voltage induced in coil due to fluctuation of l

reduce eddy current losses by providing local short circuits.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

DC series motor.

Capacitor type induction motors.

Reluctance motor.

AC slip ring IM.

DC series motor.

Capacitor type induction motors.

Reluctance motor.

AC slip ring IM.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

On armature.

On yoke in the pole faces.

On yoke in the inter pole gap.

None of these

On armature.

On yoke in the pole faces.

On yoke in the inter pole gap.

None of these

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

in parallel with the shunt field

in parallel with the series field

in series with the series field

in series with the shunt field

in parallel with the shunt field

in parallel with the series field

in series with the series field

in series with the shunt field

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

20.

0.05.

1.1.

0.905.

20.

0.05.

1.1.

0.905.

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Electrical Machines

Electrical Machines A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines In large sized DC machines the compensating windings are provided to

Electrical Machines In travelling cranes for swing action which motor is preferred?

Electrical Machines Compensating windings is placed in which part of a D.C motor?

Electrical Machines A flat compound generator is obtained from compound generator by connecting a variable resistor

Electrical Machines What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

Electrical Machines
In large sized DC machines the compensating windings are provided to

Electrical Machines
In travelling cranes for swing action which motor is preferred?

Electrical Machines
Compensating windings is placed in which part of a D.C motor?

Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?