A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

43 Amp.

44.47 Amp.

29 Amp.

33.33 Amp.

43 Amp.

44.47 Amp.

29 Amp.

33.33 Amp.

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Electrical Machines
Satisfactory commutation of DC machine requires

smooth, concentric commutator properly undercut.

brushes should be of proper grade and size.

All of these

brushes should smoothly run in the holders.

smooth, concentric commutator properly undercut.

brushes should be of proper grade and size.

All of these

brushes should smoothly run in the holders.

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Electrical Machines
Dynamic braking can be used for

All of these

shunt motors.

series motors.

compound motors.

All of these

shunt motors.

series motors.

compound motors.

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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

None of these

will become lagging

will remain the same

will become leading

None of these

will become lagging

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

Decrease in speed demanding less armature current.

Increase in speed demanding more armature current.

Decrease in speed but armature current remains the same.

Increase in speed but armature currnet remains the same.

Decrease in speed demanding less armature current.

Increase in speed demanding more armature current.

Decrease in speed but armature current remains the same.

Increase in speed but armature currnet remains the same.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

0.96

1.06

0.95

0.87

0.96

1.06

0.95

0.87

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Electrical Machines

Electrical Machines A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines Satisfactory commutation of DC machine requires

Electrical Machines Dynamic braking can be used for

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 For a given torque, reducing divertor resistance of a DC series motor

Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

Electrical Machines
Satisfactory commutation of DC machine requires

Electrical Machines
Dynamic braking can be used for

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
For a given torque, reducing divertor resistance of a DC series motor

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is