What is the principle of DC generator?

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What is the principle of DC generator?
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principle
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A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2

Description : A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. 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

Last Answer : A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. 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 0.87

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The fall in speed of a dc generator due to increase in load can be corrected by

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In a DC generator the windings of interpoles are connected :

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Last Answer : In a DC generator the windings of interpoles are connected :  in series with the armature winding, to create a pole of same polarity as the main pole ahead in the direction of rotation. 

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Last Answer : The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.

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From which material field coils of DC generator are made of?

Description : From which material field coils of DC generator are made of?

Last Answer : Field coils of DC generator are usually made of copper.

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Why is the armature of DC generator laminated?

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Last Answer : The armature of DC generator is laminated to reduce eddy current losses.

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State the function of commutator in DC generator and name the material used for commutator.

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The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.

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Last Answer : The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

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

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

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In a level compounded D.C. generator, full load terminal voltage is?

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

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

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A D.C. generator can be considered as?

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

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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.

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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.

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

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

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

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

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

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

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

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

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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?

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