D.C. generators are installed near the load centres to reduce?

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1 Answer

Answer :

D.C. generators are installed near the load centres to reduce line losses.

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The critical resistance of the D.C. generator is the resistance of?

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If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?

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A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be?

Last Answer : A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be about 2 V.

In a D.C. generator in case the resistance of the field winding is increased, then output voltage will?

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In a D.C. machine stray loss is the sum of?

Last Answer : In a D.C. machine stray loss is the sum of iron loss and mechanical loss.

A D.C. generator can be considered as?

Last Answer : A D.C. generator can be considered as rotating amplifier.

To avoid formation of grooves in the commutator of a D.C. machine?

Last Answer : To avoid formation of grooves in the commutator of a D.C. machine the brushes of opposite polarity should track each other.

In a D.C. generator the critical resistance refers to the resistance of?

Last Answer : In a D.C. generator, the critical resistance refers to the resistance of field.

Flashing the field of D.C. generator means?

Last Answer : Flashing the field of D.C. generator means creating residual magnetism by a D.C. source.

If a D.C. generator fails to build up the probable cause could not be?

Last Answer : If a D.C. generator fails to build up the probable cause could not be field resistance less than the critical resistance.

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when?

Last Answer : In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when there is no load on|he generator.

The e.m.f. generated in a D.C. generator is directly proportional to?

Last Answer : The e.m.f. generated in a D.C. generator is directly proportional to speed of armature.

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when?

Last Answer : In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when number of poles is 2.

D.C. generator generally preferred for charging automobile batteries is?

Last Answer : D.C. generator generally preferred for charging automobile batteries is long shunt compound generator.

Open circuited armature coil of a D.C. machine is?

Last Answer : Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.

Satisfactory commutation of D.C. machines requires?

Last Answer : Satisfactory commutation of D.C. machines requires brushes should be of proper grade and size, brushes should smoothly run in the holders, smooth, concentric commutator properly undercut.

The armature core of a D.C. generator is usually made of?

Last Answer : The armature core of a D.C. generator is usually made of silicon steel.

In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?

Last Answer : In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using carbon brushes of superior quality.

The demagnetising component of armature reaction in a D.C. generator?

Last Answer : The demagnetising component of armature reaction in a D.C. generator reduces generator e.m.f.

In case of D.C. machine winding, number of commutator segments is equal to?

Last Answer : In case of D.C. machine winding, number of commutator segments is equal to number of armature coils.

Eddy currents are induced in the pole shoes of a D.C. machine due to?

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If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be?

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In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be?

Last Answer : In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.

Brushes of D.C. machines are made of?

Last Answer : Brushes of D.C. machines are made of carbon.

Iron losses in a D.C. machine are independent of variations in?

Last Answer : Iron losses in a D.C. machine are independent of variations in load.

In a four-pole D.C. machine?

Last Answer : In a four-pole D.C. machine alternate poles are north and south.

For a D.C. generator when the number of poles and the number of armature conductors is fixed...

Description : For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

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The purpose of retardation test on D.C. shunt machines is to find out?

Last Answer : The purpose of retardation test on D.C. shunt machines is to find out stray losses.