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Welding generator will have lap winding.

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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 :

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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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 number of mechanical degrees and electrical degrees will be the same when number of poles is 2.

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

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

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

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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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In over compounded generator, full load terminal voltage is more than no load terminal voltage.

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In case of a flat compounded generator voltage remains constant irrespective of the load.

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An exciter for a turbo generator is a shunt generator.

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

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

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

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Description :

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be?

Answer :

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 580 V.

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Answer :

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

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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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Answer :

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

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268 views 1 answer
Description :

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly?

Answer :

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly 240 V.

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Answer :

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

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

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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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139 views 1 answer
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Answer :

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

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129 views 1 answer
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Answer :

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

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Answer :

A separately excited generator as compared to a self-excited generator is amenable to better voltage control, more stable, has exciting current independent of load current.

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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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Description :

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

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246 views 1 answer
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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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170 views 1 answer
Description :

Explain with sketch electron beam welding. 

Answer :

Electron Beam Welding Process In EBW process, the heat is generated when the electron beam impinges on work piece. As the high velocity electron beam strikes the surfaces to be welded, their kinetic ... material that is directly in the path is melted which when solidifies form the joint. 

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Description :

State the four advantages of MIG welding.  

Answer :

Four advantages of MIG welding: 1. High quality welds can be produced much faster. 2. Flux is not used there is no chance for the entrapment of slag in the weld metal resulting in high quality ... of metals and alloys. 5. Least expensive and highly economic. 6. Little or no post welds cleaning.

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12 views 1 answer
Description :

List two special feature of welding transformer.

Answer :

Special features of welding transformer: i) It is a step down transformer that reduces the source voltage to a voltage desired according to the demands of the welding process. ii) Having large primary turns and less ... V ii) Secondary voltage - 40 to 60 V iii) Secondary current - 200 to 600 A

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41 views 1 answer
Description :

Welding Defects 

Answer :

Welding Defects  Welding defects Explanation and causes 1. Cracks Cracks occur when localized stresses exceed the ultimate tensile strength of material. These stresses are developed due to shrinkage ... Too fast a travel, Bad welding technique, Too great a heat build-up.

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39 views 1 answer
Description :

State the applications of TIG welding.

Answer :

The applications of TIG welding are as follows: 1. Mostly used to weld aluminum and aluminum alloys. 2. It is used to weld stainless steel, carbon base alloy, copper base alloy, nickel base alloy etc. 3. It is used to welding dissimilar metals. 4. It is mostly used in aerospace industries.

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54 views 1 answer
Description :

Describe with a neat diagram, the process of any one type of electric welding. 

Answer :

Methods of electric welding :  1. Resistance welding  i Butt welding  ii Spot welding  iii Seam welding  iv Projection welding  2. Arc Welding  i Carbon arc welding  ii ... as copper, iron etc. The electric arc effectively concentrate heat on the surfaces it is desired to join.

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Description :

Compare between Resistance welding and Arc welding on any six points.

Answer :

Sr.No Parameters Resistance Welding Arc Welding 1 Type of welding Plastic/Pressure/Non-fusion welding Fusion/Non pressure welding 2 Principle of heat developed Heat ... It is suitable for mass production It is suitable for heavy job, maintenance and repair work

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71 views 1 answer
Description :

For arc welding current range is usually  (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A

Answer :

For arc welding current range is usually 100 to 350 A

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126 views 1 answer
Description :

Spot welding is used for (1) Thin metal (3) Castings only (2) Rough and irregular surface (4) Thick sections

Answer :

Spot welding is used for Thin metal

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82 views 1 answer
Description :

Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  (C) Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

Answer :

Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  ... Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

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84 views 1 answer
Description :

The electrode rod used for welding uses a coating on it 

Answer :

The electrode rod used for welding uses a coating on it  to give a vapour to serve as a shielding gas to protect the weld area from atmospheric contamination and to provide slag to protect the welded area

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98 views 1 answer
Description :

The supply for arc welding is : 

Answer :

The supply for arc welding is : Low voltage, high current ac or dc voltage

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61 views 1 answer
Description :

What are the different types of welding?

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