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

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

Field coils of DC generator are usually made of copper.

## Related questions

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

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

Answer : The purpose of providing dummy coils in a generator is to provide mechanical balance for the rotor.

Description : Brushes of DC machine are made up of ?

Description : 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.  ... winding, to create a pole of opposite polarity as the main pole ahead in the direction of rotation.

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.

Description : Field control of DC motor

Answer : Field control of DC motor

Answer : A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.

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

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

Description : The fall in speed of a dc generator due to increase in load can be corrected by  (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover

Answer : It   can  be  corrected  by  increasing  the  input  to  the  prime  mover.

Description : What is the difference between an AC and DC generator?

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.

Description : What is the principle of DC generator?

Description : Why is the armature of DC generator laminated?

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

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

Answer : Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.

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.

Answer : In a A.C. series motor armature coils are usually connected to commutator through resistance.

Answer : If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.

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

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

Description : 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 :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

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

Description : The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator

Answer : The terminal characteristics of a dc generator suitable for electric welders is differentially compounded generator

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

Answer : 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.

Answer : If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.

Answer : The rotor of a hysteresis motor is made of chrome steel.

Answer : The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.

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

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

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

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

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

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

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

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

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

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

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

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

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

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. ?

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

Answer : The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.

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

Description : The desirable properties of transformer core material are  (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.

Answer : The desirable properties of transformer core material are high permeability and low hysteresis loss.

Description : In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load  (A) The armature current increases and the power factor decreases  (B) The armature ... but is lagging  (D) The armature current decreases and the power factor increases and is leading

Answer : In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load The armature current decreases and the power factor increases and is leading

Description : In DC generators lamination core are generally made of?

Answer : In DC generators lamination core are generally made of silicon steel.

Description : D.C. shunt relays are made of?

Answer : D.C. shunt relays are made of many turns of thin wire.

Description : What are the main parts of a generator?

Answer : the main parts of the generator are as follows yoke Armature Poles field winding Prime mover  Commutator Shaft Bearings Brushes

Description : What material should children's furniture be made of?

Answer : The most ideal option is furniture made from natural wood. Such material is environmentally friendly, however, many varieties of valuable species are quite expensive. In view of the limited family ... your liking, because, despite its versatility and safety, it should please and bring pleasure.

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