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In D.C. generators the polarity of the interpoles is the same as that of the main pole ahead.

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In D.C. generators the pole shoes are fastened to the pole core by counter sunk screws.

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For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.

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D.C. generators are connected to the busbars or disconnected from them only under the floating condition to avoid sudden loading of the primemover, to avoid mechanicaljerk to the shaft, to avoid burning of switch contacts.

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

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D.C. generators are normally designed for maximum efficiency around full-load.

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In a DC generator the windings of interpoles are connected :  (A) in series with main field winding, to create a pole,of same polarity as the main pole ahead in the direction of rotation.  (B) in series with main field winding, to create a pole of opposite polarity as the main pole ahead in the direction of ... in the direction of rotation.  (D) in series with the armature winding, to create a pole of opposite polarity as the main pole ahead in the direction of rotation.

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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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In DC generators lamination core are generally made of?

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Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound 

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In D.C. generators on no-load, the air gap flux distribution in space is flat topped.

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Why are generators rated in kVA not in kW ?

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In a dc machine, interpoles are used to  (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

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In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

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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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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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In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.

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

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

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

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

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

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

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

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

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Magnetic field in a D.C. generator is produced by electromagnets.

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

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

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Eddy currents are induced in the pole shoes of a D.C. machine due to relative rotation between field and armature.

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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 crossmagnetisation as well as demagnetising.

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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 8.

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

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

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In a D.C. generator, the iron losses mainly take place in armature rotor.

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The total losses in a well designed D.C. generator of 10 kW will be nearly 500 W.

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

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

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A D.C. generator can be considered as rotating amplifier.

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