In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

it reduces field structure iron losses

it gives more uniform air-gap flux distribution

dc machines are comparatively low rating machines.

commutator action is not possible otherwise

it reduces field structure iron losses

it gives more uniform air-gap flux distribution

dc machines are comparatively low rating machines.

commutator action is not possible otherwise

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

All of these

frequency of waveform.

number of turns in coil.

flux per pole.

All of these

frequency of waveform.

number of turns in coil.

flux per pole.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

component of armature mmf along field axis

non-sinusoidal nature of armature mmf

magnetic saturation in half of the field pole

uneven air-gap length

component of armature mmf along field axis

non-sinusoidal nature of armature mmf

magnetic saturation in half of the field pole

uneven air-gap length

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

to reduce eddy current loss.

to reduce mechanical losses.

to reduce hysteresis loss.

to provide better flux linkage.

to reduce eddy current loss.

to reduce mechanical losses.

to reduce hysteresis loss.

to provide better flux linkage.

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Electrical Machines
Example of double excited machine is

DC Shunt Motor

Both are correct.

Synchronous motor.

None of these

DC Shunt Motor

Both are correct.

Synchronous motor.

None of these

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

both the windings have thick leads

armature winding has thin leads whereas field winding has thick leads

armature winding has thick leads whereas field winding has thin leads

both the windings have thin leads

both the windings have thick leads

armature winding has thin leads whereas field winding has thick leads

armature winding has thick leads whereas field winding has thin leads

both the windings have thin leads

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Electrical Machines

Electrical Machines In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

Electrical Machines In an alternator the voltage generated per phase is proportional to

Electrical Machines In a dc machine, the demagnetizing effect of armature reaction is due to

Electrical Machines The armature core of the rotor bars of dc motors are laminated

Electrical Machines Example of double excited machine is

Electrical Machines A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

Electrical Machines
In an alternator the voltage generated per phase is proportional to

Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

Electrical Machines
The armature core of the rotor bars of dc motors are laminated

Electrical Machines
Example of double excited machine is

Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine