Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

4.

1/2.

1/4.

8.

4.

1/2.

1/4.

8.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The synchronous reactance( Xs) is the

combined reactance due to armature reaction and leakage flux

reactance due to leakage flux

reactance either due to armature reaction or leakage flux

reactance due to armature reaction of the machine

combined reactance due to armature reaction and leakage flux

reactance due to leakage flux

reactance either due to armature reaction or leakage flux

reactance due to armature reaction of the machine

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Copper brushes in DC machine are used

in both of above cases.

where low voltage and high currents are involved.

where high voltage and low current.

None of these

in both of above cases.

where low voltage and high currents are involved.

where high voltage and low current.

None of these

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
DC generator will not build up voltage

any one of above.

if field resistance is more than critical resistance.

due to wrong direction of rotation.

if it has lost residual magnetism.

any one of above.

if field resistance is more than critical resistance.

due to wrong direction of rotation.

if it has lost residual magnetism.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

225 V.

222 V.

220 V.

230 V.

225 V.

222 V.

220 V.

230 V.

ANSWER DOWNLOAD EXAMIANS APP

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

increasing field current.

reversing the field current.

reversing field electric current as well as direction of rotation.

any of above.

increasing field current.

reversing the field current.

reversing field electric current as well as direction of rotation.

any of above.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines The synchronous reactance( Xs) is the

Electrical Machines Copper brushes in DC machine are used

Electrical Machines DC generator will not build up voltage

Electrical Machines For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

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

Electrical Machines
The synchronous reactance( Xs) is the

Electrical Machines
Copper brushes in DC machine are used

Electrical Machines
DC generator will not build up voltage

Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

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