A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

6 V

474 V

240 V

234 V

6 V

474 V

240 V

234 V

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

1 Hz

50 Hz

5 Hz

0 Hz

1 Hz

50 Hz

5 Hz

0 Hz

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

decrease in speed demanding less armature current.

increase in speed but armature currnet remains the same.

increase in speed demanding more armature current.

decrease in speed but armature current remains the same.

decrease in speed demanding less armature current.

increase in speed but armature currnet remains the same.

increase in speed demanding more armature current.

decrease in speed but armature current remains the same.

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Electrical Machines
The polarity of a DC generator can be reversed by

reversing the field current.

increasing field current.

any of above.

reversing field electric current as well as direction of rotation.

reversing the field current.

increasing field current.

any of above.

reversing field electric current as well as direction of rotation.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

920 RPM

960 RPM

970 RPM

940 RPM

920 RPM

960 RPM

970 RPM

940 RPM

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Electrical Machines
In synchronous motor, the damper winding is generally used to

reduce noise level only.

provide starting torque only.

reduce the eddy currents.

prevent hunting and provide the starting torque.

reduce noise level only.

provide starting torque only.

reduce the eddy currents.

prevent hunting and provide the starting torque.

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Electrical Machines

Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

Electrical Machines A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

Electrical Machines For a given torque, reducing diverter resistance of a DC series motor causes

Electrical Machines The polarity of a DC generator can be reversed by

Electrical Machines φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines In synchronous motor, the damper winding is generally used to

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

Electrical Machines
The polarity of a DC generator can be reversed by

Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

Electrical Machines
In synchronous motor, the damper winding is generally used to