Why is the extraction a very important part of the brazing hearth set up?

Why is the extraction a very important part of the brazing hearth set up?
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1 Answer

Answer :

The fumes that are extracted via extraction are seriouslyharmful to our lungs.
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Related questions

Pick up the correct statement from the following: (A) Solder material is an alloy which melts at a temperature above 400°C (B) Brazing is done at temperature above 600°C to 1100°C (C) Brazing joint is stronger than the solder joint (D) All the above

Description : Pick up the correct statement from the following: (A) Solder material is an alloy which melts at a temperature above 400°C (B) Brazing is done at temperature above 600°C to 1100°C (C) Brazing joint is stronger than the solder joint (D) All the above

Last Answer : Answer: Option D

When brazing the lowest effective brazing temperatures possible should be used to minimize the effects of heat on the base metal?

Description : When brazing the lowest effective brazing temperatures possible should be used to minimize the effects of heat on the base metal?

Last Answer : Yes, that is proper technique.

The largest consumption of zinc for alloys is in the making of (A) Bearing metal (B) Brasses (C) Brazing solder

Description : The largest consumption of zinc for alloys is in the making of (A) Bearing metal (B) Brasses (C) Brazing solder

Last Answer : (B) Brasses

What is soldering and what is brazing?

Description : What is soldering and what is brazing?

Last Answer : Soldering is the process of joining two metals with an alloy whose melting point is less that of the materials to be soldered. Soldering at high temperature using brass as solder is called brazing or hard ... soft solder) is tin 60% and lead 40%. Its melting point is 190°C and is widely used.  

Brazing filler metal used for joining steel plates (A) Melts below the melting points of base metals (B) Melts below 300°C (C) Is copper phosphorous alloy

Description : Brazing filler metal used for joining steel plates (A) Melts below the melting points of base metals (B) Melts below 300°C (C) Is copper phosphorous alloy

Last Answer : (A) Melts below the melting points of base metals

Out of the following, the joint produced by __________ has the lowest strength. (A) Soldering (B) Welding (C) Brazing (D) Riveting

Description : Out of the following, the joint produced by __________ has the lowest strength. (A) Soldering (B) Welding (C) Brazing (D) Riveting

Last Answer : (A) Soldering

Brazing is the joining of metals (A) Without melting the base metal (B) With a non-ferrous filler (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Brazing is the joining of metals (A) Without melting the base metal (B) With a non-ferrous filler (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : Option C

. Lap joints are preferred over butt joints in soldering/brazing, because these joints are (A) Weaker in tension but stronger in shear (B) Weaker in shear but stronger in tension (C) Stronger in both shear and tension (D) The lap joints are easily made

Description : . Lap joints are preferred over butt joints in soldering/brazing, because these joints are (A) Weaker in tension but stronger in shear (B) Weaker in shear but stronger in tension (C) Stronger in both shear and tension (D) The lap joints are easily made

Last Answer : r: Option D

Describe briefly soldering and brazing operation.

Description : Describe briefly soldering and brazing operation.

Last Answer : Soldering: It is a method of joining two or more pieces of metal sheets by means of a fusible alloy or metal , called solder, applied in the molten state. The melting point of the ... by metallic bonding. Copper, Copper alloys, Silver alloys and Aluminium alloys are used for brazing process. 

Compare Brazing and Soldering on the basis of : (i) Temperature Used. (ii) Filler Material. (iii) Joint Strength (iv) Applications.

Description : Compare Brazing and Soldering on the basis of : (i) Temperature Used. (ii) Filler Material. (iii) Joint Strength (iv) Applications.

Last Answer : Comparison of Brazing and Soldering:

Define brazing.

Description : Define brazing.  

Last Answer : Brazing: It is a metal joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint, the filler metal having a lower melting point than the adjoining metal. 

Which of the manufacturing processes is/are required to make a typical stainless steel spoon out of sheet metal? A. Casting B. Forming C. Brazing D. Blow moulding

Description : Which of the manufacturing processes is/are required to make a typical stainless steel spoon out of sheet metal? A. Casting B. Forming C. Brazing D. Blow moulding

Last Answer : Forming

Differentiate between soldering and brazing

Description : Differentiate between soldering and brazing

Last Answer : Answer: Comparison of brazing and soldering

Define the terms: i) Hardness ii) Toughness iii) Brazing iv) Machinability

Description : Define the terms: i) Hardness ii) Toughness iii) Brazing iv) Machinability

Last Answer : i) Hardness:- Hardness is the property of metal possessed by a material which enables it to resist penetration or abrasion or scratching by other material. Diamond is the hardest of known materials.  ... can be easily cut by cutting tools to produce a desired shape & surface finish on its surface

If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace. (A) Sidefired (B) Underfired (C) Covered (D) Recirculating

Description : If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace. (A) Sidefired (B) Underfired (C) Covered (D) Recirculating

Last Answer : (B) Underfired

Pick up the correct statement from the following: (A) Steel produced by open hearth process is milder than that obtained by the Bessemer process (B) Engineers prefer open hearth steel for structural purpose as it is more homogenous (C) Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel

Description : Pick up the correct statement from the following: (A) Steel produced by open hearth process is milder than that obtained by the Bessemer process (B) Engineers prefer open hearth steel ... is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) In basic Bessemer process, the steel heats the converter (B) In open-hearth process, the furnace heats the steel (C) In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore (D) All the above

Description : Pick up the correct statement from the following: (A) In basic Bessemer process, the steel heats the converter (B) In open-hearth process, the furnace heats the steel (C) In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore (D) All the above

Last Answer : Answer: Option D

What suggestions do you have for removing candle wax from a brick hearth?

Description : What suggestions do you have for removing candle wax from a brick hearth?

Last Answer : Have you tried laying down a piece of rag and running the iron over that? It seems like the wax should melt and be absorbed by the material.

Who was the Roman goddess of the hearth?

Description : Who was the Roman goddess of the hearth?

Last Answer : Vesta

Who wrote the hearth of Ekattar ?

Description : Who wrote the hearth of Ekattar ?

Last Answer : Written by Abubakar Siddique.

What is the cultural hearth of Judaism?

Description : What is the cultural hearth of Judaism?

Last Answer : Feel Free to Answer

What foods can I start eating to improve my hearth health?

Description : What foods can I start eating to improve my hearth health?

Last Answer : Some easy ways to improve heart health are to eat low fat foods, reduce your weight by 10%, and exercise more. Here are five other ways in more detail: http://phobos.doctorspreferred.com/Emails/JWHH/eletter_021408_default.html

In India the rails are manufactured by A. Open hearth process B. Duplex process C. Both A & B D. None of These

Description : In India the rails are manufactured by A. Open hearth process B. Duplex process C. Both A & B D. None of These

Last Answer : C [Both A & B]

Neutral atmosphere is maintained in a/an __________ furnace. (A) Cold rolled steel coil annealing (B) Open hearth (C) Soaking pit (D) Walking beam reheating

Description : Neutral atmosphere is maintained in a/an __________ furnace. (A) Cold rolled steel coil annealing (B) Open hearth (C) Soaking pit (D) Walking beam reheating

Last Answer : (A) Cold rolled steel coil annealing

Which furnace employs preheating, heating and soaking zones? (A) Soaking pit (B) Reheating furnace (C) Open hearth furnace (D) Cupola

Description : Which furnace employs preheating, heating and soaking zones? (A) Soaking pit (B) Reheating furnace (C) Open hearth furnace (D) Cupola

Last Answer : (B) Reheating furnace

Regenerators are normally provided in the (A) Glass melting furnace (B) Open hearth furnace (C) By product coke ovens (D) All (A), (B) and (C)

Description : Regenerators are normally provided in the (A) Glass melting furnace (B) Open hearth furnace (C) By product coke ovens (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Regenerators are normally provided in the (A) Glass melting furnace (B) Open hearth furnace (C) By product coke ovens (D) All (A), (B) and (C)

Description : Regenerators are normally provided in the (A) Glass melting furnace (B) Open hearth furnace (C) By product coke ovens (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Large tonnage of refractory bricks are dried in a (A) Shaft furnace (B) Rotary hearth furnace (C) Tunnel kiln (D) Muffle furnace

Description : Large tonnage of refractory bricks are dried in a (A) Shaft furnace (B) Rotary hearth furnace (C) Tunnel kiln (D) Muffle furnace

Last Answer : (C) Tunnel kiln

Unit of furnace loading is (A) Ton stock/hr/m2 hearth area (B) Ton stock/hr (C) Ton stock/m2 hearth area (D) Both (B) and (C)

Description : Unit of furnace loading is (A) Ton stock/hr/m2 hearth area (B) Ton stock/hr (C) Ton stock/m2 hearth area (D) Both (B) and (C)

Last Answer : (A) Ton stock/hr/m2 hearth area

Regenerators are installed in (A) Coke ovens (B) Open hearth furnace (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Regenerators are installed in (A) Coke ovens (B) Open hearth furnace (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

__________ is an indirectly heated furnace. (A) Open hearth furnace (B) Muffle furnace (C) Soaking pit (D) Reheating furnace

Description : __________ is an indirectly heated furnace. (A) Open hearth furnace (B) Muffle furnace (C) Soaking pit (D) Reheating furnace

Last Answer : (B) Muffle furnace

Thermal efficiency of an open hearth furnace may be about __________ percent. (A) 5 (B) 20 (C) 50 (D) 80

Description : Thermal efficiency of an open hearth furnace may be about __________ percent. (A) 5 (B) 20 (C) 50 (D) 80

Last Answer : (B) 20

Which of the following is not a directly fired furnace? (A) By-product coke oven (B) Calcination kiln (C) Sintering furnace (D) Open hearth furnace

Description : Which of the following is not a directly fired furnace? (A) By-product coke oven (B) Calcination kiln (C) Sintering furnace (D) Open hearth furnace

Last Answer : (A) By-product coke oven

An example of recuperative furnace is the (A) Soaking pit (B) Open hearth furnace (C) Coke ovens (D) None of these

Description : An example of recuperative furnace is the (A) Soaking pit (B) Open hearth furnace (C) Coke ovens (D) None of these

Last Answer : (A) Soaking pit

Which is a regenerative furnace? (A) Coke oven heating chamber (B) Open hearth furnace (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Which is a regenerative furnace? (A) Coke oven heating chamber (B) Open hearth furnace (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Hearth furnaces are not used for (A) Roasting (B) Melting (C) Reheating (D) None of these

Description : Hearth furnaces are not used for (A) Roasting (B) Melting (C) Reheating (D) None of these

Last Answer : (D) None of these

Which is not a hearth furnace? (A) Glass tank furnace (B) Open hearth furnace (C) Cupola

Description : Which is not a hearth furnace? (A) Glass tank furnace (B) Open hearth furnace (C) Cupola

Last Answer : (C) Cupola

An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace. (A) Walking beam (B) Shaft (C) Tunnel (D) Rotary hearth

Description : An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace. (A) Walking beam (B) Shaft (C) Tunnel (D) Rotary hearth

Last Answer : (A) Walking beam

The heating capacity of continuous reheating furnace depends upon the (A) Hearth area and furnace temperature (B) Emissivity of the stock (C) Ratio of wall surface to stock surface (D) All (A), (B) and (C)

Description : The heating capacity of continuous reheating furnace depends upon the (A) Hearth area and furnace temperature (B) Emissivity of the stock (C) Ratio of wall surface to stock surface (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Softer variety of steel may be obtained by (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth

Description : Softer variety of steel may be obtained by (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth

Last Answer : Answer: Option C

The steel which contains fissures and cavities, is manufactured by (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Description : The steel which contains fissures and cavities, is manufactured by (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Last Answer : Answer: Option A

The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Description : The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Last Answer : Answer: Option B

The process of decarbonising the pig iron completely and then adding proper percentage of carbon for manufacturing steel, is called (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Description : The process of decarbonising the pig iron completely and then adding proper percentage of carbon for manufacturing steel, is called (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Last Answer : Answer: Option A

Cast steel is manufactured by (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth proce

Description : Cast steel is manufactured by (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process

Last Answer : Answer: Option B

Which of the following is the most suitable for extraction in a system having very low density difference? (A) Mixer-settler extractor (B) Centrifugal extractor (C) Pulsed extractor (D) Packed extraction tower

Description : Which of the following is the most suitable for extraction in a system having very low density difference? (A) Mixer-settler extractor (B) Centrifugal extractor (C) Pulsed extractor (D) Packed extraction tower

Last Answer : (B) Centrifugal extractor

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when (A) Extracting solvent is cheaply & abundantly available (B) One of the liquid components is heat sensitive (C) Viscosity of liquid components is very high (D) One of the liquid components has very high affinity towards the solvent

Description : Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when (A) Extracting solvent is cheaply & abundantly available ... very high (D) One of the liquid components has very high affinity towards the solvent

Last Answer : (D) One of the liquid components has very high affinity towards the solvent

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using (A) Liquid extraction (B) Distillation (C) Evaporation (D) Absorption

Description : Heat sensitive materials with very high latent heat of vaporisation may be economically separated using (A) Liquid extraction (B) Distillation (C) Evaporation (D) Absorption

Last Answer : (A) Liquid extraction

Pick out the wrong statement. (A) Critical moisture content is not a property of the material itself (B) A sharp increase in pressure drop gives an indication of the flooding in a distillation column (C) Separation of components is not possible in liquid extraction, if selectivity is unity (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

Description : Pick out the wrong statement. (A) Critical moisture content is not a property of the material itself (B) A sharp increase in pressure drop gives an indication of the flooding in a ... unity (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

Last Answer : (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

The solvent used in liquid extraction should not have high latent heat of vaporisation, because (A) The pressure drop and hence the pumping cost will be very high (B) It cannot be recovered by distillation (C) Its recovery cost by distillation may be prohibitively high (D) It will decompose while recovering by distillation

Description : The solvent used in liquid extraction should not have high latent heat of vaporisation, because (A) The pressure drop and hence the pumping cost will be very high (B) It cannot ... by distillation may be prohibitively high (D) It will decompose while recovering by distillation

Last Answer : (C) Its recovery cost by distillation may be prohibitively high

In liquid extraction, if the selectivity is unity, then (A) Separation of the constituents is the most effective (B) No separation will occur (C) Amount of solvent required will be minimum (D) Solvent flow rate should be very low

Description : In liquid extraction, if the selectivity is unity, then (A) Separation of the constituents is the most effective (B) No separation will occur (C) Amount of solvent required will be minimum (D) Solvent flow rate should be very low

Last Answer : (B) No separation will occur