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 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

it reduces field structure iron losses

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

oscillation cannot be damped.

running the motor on leading power factors.

providing damper bars in the rotor pole faces.

maintaining constant excitation.

oscillation cannot be damped.

running the motor on leading power factors.

providing damper bars in the rotor pole faces.

maintaining constant excitation.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

Output power at the shaft.

Power drawn in KVA.

Gross power.

Power drawn in KW.

Output power at the shaft.

Power drawn in KVA.

Gross power.

Power drawn in KW.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

220 volt.

440 volt.

230 volt.

240 volt.

220 volt.

440 volt.

230 volt.

240 volt.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

more.

less than 50%.

between 50% and 90%.

same.

more.

less than 50%.

between 50% and 90%.

same.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

more than 220 V

6 V

220 V

somewhat less than 220 V

more than 220 V

6 V

220 V

somewhat less than 220 V

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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 The oscillation in a synchronous motor can be damped out by

Electrical Machines The output power indicated on the name plate of any motor is always the

Electrical Machines A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

Electrical Machines As compared to an induction motor, the air gap in a DC motor is

Electrical Machines A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

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
The oscillation in a synchronous motor can be damped out by

Electrical Machines
The output power indicated on the name plate of any motor is always the

Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up