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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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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.

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Description :

Answer :

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

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Description :

The magnetic neutral plane shifts in a dc machine (A) in the direction of motion of motor (B) in the direction of motion of generator (C) due to increase in the field flux (D) cause reduction of flash over between commutator segments

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The magnetic neutral plane shifts in a dc machine in the direction of motion of generator

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Description :

Answer :

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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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 :

Wave winding

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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.

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156 views 1 answer
Description :

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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Answer :

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

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

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Description :

Answer :

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

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Description :

Answer :

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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143 views 1 answer
Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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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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Description :

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

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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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Description :

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

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

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178 views 1 answer
Description :

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

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422 views 1 answer
Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

What happens when a neutral wire touches a phase wire ?

Answer :

Maximum current flow due to Short circuit, limited value of fuse will burn else apparatus and conductor will be damaged.

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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.

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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

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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.  (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.

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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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.

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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

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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

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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.

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Description :

What is the principle of DC generator?

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Description :

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

Answer :

Field coils of DC generator are usually made of copper.

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Description :

Why is the armature of DC generator laminated?

Answer :

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

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Description :

Answer :

A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.

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Description :

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

Answer :

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator 

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383 views 1 answer
Description :

To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?

Answer :

To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ? Δ-Δ connection

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517 views 1 answer
Description :

lf the poles of system are lying on the imaginary axis in s-plane, then the system will be

Answer :

lf the poles of system are lying on the imaginary axis in s-plane, then the system will be marginally stable

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87 views 1 answer
Description :

Center of gravity of a solid cone lies on the axis at the height?

Answer :

Center of gravity of a solid cone lies on the axis at the height one-fourth of the total height above base.

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114 views 1 answer
Description :

Answer :

Advantages of vertical axis wind mills: 1. Simple blade design 2. Low cost of fabrication. 3. No yaw controller required. 4. Easy maintenance because ground mounted generator and gear box. 

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60 views 1 answer
Description :

In a three-phase supply floating neutral is undesirable because it way give rise to?

Answer :

In a three-phase supply floating neutral is undesirable because it way give rise to unequal line voltages across the load.

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103 views 1 answer
Description :

Answer :

Due to no potential difference between the ends of the circiut there is no existance of current 

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Description :

Explain the meaning of following terms: i) MCB ii) Socket outlet iii) Neutral iv) Fuse-link

Answer :

i) MCB:  Miniature circuit breaker operates automatically at the time of fault or over load. And it is used for the protection of electrical installation. They are available from 0.5 A to 100 Amps. ... melts automatically at the time of fault or over load. Fuse must be replaced after the fault.

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105 views 1 answer
Description :

Answer :

Ungrounded neutral transmission system is not recommended because of system insulation being overstressed due to over voltages, insulation overstress may lead to failure and subsequent phase to phase faults, being inadequately protected against ground fault.

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55 views 1 answer
Description :

Which color wire is neutral?

Answer :

Black but I think it depends with the place.

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Description :

Answer :

Armature reaction in a generator results in demagnetisation of leading pole tip and magnetisation of trailing pole tip.

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Description :

Answer :

In a separately excited generator supplying rated load the armature reaction is always present.

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