MCQ’s On Smithing and Forging
Q. Low carbon steels can be started to forge at what temperature?
A. 1140°C
B. 1270°C
C. 1350°C
D. 1420°C
.
.Answer: B
Explanation: Process Low carbon soft steels are generally used for making seamless and welded steel pipes, which can be used at very low temperatures. They can be forged at a temperature range of 1250°C to 1300°C.
Q. Low carbon steels get forged at what temperature?
A. 670°C
B. 730°C
C. 820°C
D. 950°C
.
.Answer: C
Explanation: Process None.
Q. At what temperature does the high carbon steel get forged?
A. 950°C
B. 1510°C
C. 1150°C
D. 1290°C
.
.Answer: C
Explanation: Process The high carbon steel is provided heat treatment, after this, the steel is allowed to quench and then tempered. They can be forged at a temperature of 1100°C.
Q. At what temperature does alloy steel get forged?
A. 850°C
B. 970°C
C. 1050°C
D. 1200°C
.
.Answer: A
Explanation: Process For the improvisation of mechanical and physical properties of the materials, a variety of materials are added and to make it alloying steel. The temperature at which alloy steel can be forged is in the range of 825°C to 875°C.
Q. At what temperature does wrought irons get forged?
A. Below 1000°C
B. Below 1100°C
C. Below 1200°C
D. Below 1300°C
.
..Answer: D
Explanation: Process Wrought irons are identified as alloys of iron which contain very low amount of carbon in them. Wrought irons can be forged at a temperature below 1300°C.
Q. What is the forging temperature of brass?
A. 450°C
B. 500°C
C. 550°C
D. 600°C
.
..Answer: D
Explanation: Process Brass is an alloy of mainly two metals being, copper and zinc. These two metals can substitute each other’s place in the structure of the alloy. The temperature at which brass gets forged is about 600°C.
Q. What is the forging temperature of bronze?
A. 850°C
B. 900°C
C. 950°C
D. 1000°C
.
.Answer: C
Explanation: Process Bronze is an alloy that essentially contains copper in it and generally is found to contain about 12% of tin. It may also have some other additives in it like, manganese, zinc or nickel. The temperature at which bronze gets forged is about 950°C.
Q. What is the forging temperature of magnesium alloys?
A. 450°C
B. 500°C
C. 550°C
D. 600°C
.
.Answer: B
Explanation: Process Metals such as zinc, copper, zirconium, silicon or aluminium are mixed with magnesium to form a magnesium alloy. In terms of structure, magnesium is considered to be the lightest metal. The temperature at which magnesium alloys get forged is 500°C.
Q. The grain size of steel increases with an increase in temperature.
A. True
B. False
.
.Answer: A
Explanation: Process With an increase in the temperature, when the temperature goes above the upper critical temperature limit, the grain size of steel also begins to increase. However, on forging, the grain is broken down.
Q. Cold working of steel takes place at a temperature below 823°C.
A. True
B. False
.
.Answer: B
Explanation: Process If the hammering of steel has to take place under the temperature of 723°C, then this working would be considered as cold working. By doing this, one may expect for the occurrence of small hair cracks.
Q. Which of the following operations involves reduction in length?
A. Upsetting
B. Drawing down
C. Setting down
D. Punching
.
.Answer: A
Explanation: Process There are a few operations, which are needed for a change of shape of the raw material to its finished form. This can be achieved using smith forging operation. Upsetting is one such operation that involves reduction in length for an increase the thickness.
Q. Swaging is another name for which smith forging operation?
A. Bending
B. Punching
C. Drawing down
D. Cutting
.
.Answer: C
Explanation: Process Swaging is another name for the operation drawing down. In drawing down operation, the length of the material is found to increase at an expense of the width or thickness of it.
Q. Which of the following operations involves the reduction in length?
A. Upsetting
B. Drawing down
C. Setting down
D. Punching
.
.Answer: B
Explanation: Process There are a few operations, which are needed for a change of shape of the raw material to its finished form. This can be achieved using smith forging operation. Drawing down is one such operation that involves increase in length at the cost of its thickness.
Q. Which of the following material is not used as a flux in forge welding?
A. 2 parts of borax with one part of sal-ammoniac
B. Quartz sand
C. Calcined borax
D. 3 parts of borax with one part of sal-ammoniac
.
.Answer: A
Explanation: Process The metal which has to be welded, has to be first covered with flux. By covering it with flux, it cuts the metal from the air around and prevents from oxidation. The fluxes used for this purpose are quartz sand, calcined borax and 3 parts of borax with one part of sal-ammoniac.
Q. In which form of weld, are the ends joined?
A. Lap weld
B. Butt weld
C. Jump weld
D. Split weld
.
.Answer: A
Explanation: Process In lap weld, the ends of the two metals which are to be joined are prepared for welding. In butt welding, the materials are butted are together. In split weld, the metals are kept like a fork in a ‘V’ shape.
Q. Which form of weld is also called as ‘T’ weld?
A. Lap weld
B. Butt weld
C. Jump weld
D. Split weld
.
.Answer: C
Explanation: Process In butt welding, the materials are butted are together. In jump welding, the two pieces are kept at an angle of 90o, in the form of an inverted ‘T’.
Q. In cutting smith forging operation, up to what temperature is the steel heated?
A. 700°C – 800°C
B. 850°C – 950°C
C. 900°C – 1000°C
D. 1000°C – 1100°C
.
.Answer: B
Explanation: Process Cutting is a form of smith forging operation, it is a form of chiseling. For chiseling, a long piece of metal is cut into equal lengths. These equal lengths need to be heated till they are cherry red hot, which makes it a temperature of 850°C to 950°C.
Q. Which form of weld is also called as ‘V’ weld?
A. Lap weld
B. Butt weld
C. Jump weld
D. Split weld
.
..Answer: D
Explanation: Process In butt welding, the materials are butted are together. In split weld, the metals are kept like a fork in a ‘V’ shape.
Q. Scarfing is a preparation of metals for welding.
A. True
B. False
.
.Answer: A
Explanation: Process The shaping of the metal pieces, in order they get united at the center, and a correct shape gets formed, the metal pieces need to be prepared for welding before they actually get welded. This preparation for welding of metals is termed as scarfing.
Q. In bending, the layer on the inside gets shortened.
A. True
B. False
.
.Answer: A
Explanation: Process Bending is a type of Process that is most frequently used in forging. It can be done over the edge of the anvil face or the anvil horn. When the metal undergoes bending, the layer which is present on the inside gets shortened and the layer on the outside gets stretched.
Q. In compressed impression die forging, what is typically the shape of the solid blanks?
A. Cylindrical
B. Conical
C. Spherical
D. Pyramidal
.
.Answer: A
Explanation: Process In compressed impression die forging, it is generally observed that the shape of solid blanks is either cylindrical or prismatic only. The shape of the solid blanks is similar even in case of stamping industry.
Q. Which of the following is not an operation of impression die forging?
A. Broaching
B. Quenching
C. Bending
D. Spreading
.
.Answer: B
Explanation: Process There are many basic and primary operations in impression die forging, a few of them are, broaching, bending, spreading, sizing and swaging. But, quenching is not any of the operations of impression die forging.
Q. Which of the following is not produced using impression die forging?
A. Levers
B. Handles
C. Gears
D. Turbine blades
.
.Answer: B
Explanation: Process Impression die forging finds itself into variety of applications. They are used in making a few automobile parts also. Among the following, levers, gears and turbine blades can be produced using impression die forging, but not handles.
Q. Which of the following are not operated in impression die forging?
A. Hammers
B. Presses
C. Tongs
D. Special purpose machines
.
.Answer: C
Explanation: Process In impression die forging, there are various such articles which can be forged, but after that need a little working on it. To accomplish that, hammers, presses and some other special purpose machining tools are employed. A tong is not one of them.
Q. In forging dies, what is the maximum degree to which the drafts are made?
A. 7o
B. 10o
C. 13o
D. 18o
.
.Answer: B
Explanation: Process In impression die forging, there has to be some amount of allowance given to the Process, like machining allowance and draft allowance. The drafts are made with a maximum degree deviation of 10o.
Q. In forging dies, what is the minimum degree to which the drafts are made?
A. 1o
B. 2o
C. 3o
D. 4o
.
.Answer: C
Explanation: Process There are some types of allowances which have to be given to the system before the operations begin, like, shrinkage allowance, machining allowance and draft allowance. The minimum angle which can be given to the drafts is only 3o.
Q. What is the minimum temperature given before hot forging?
A. 100°C
B. 150°C
C. 200°C
D. 250°C
.
.Answer: C
Explanation: Process Hot forging is a method of forging articles at an extremely high temperature. But, before putting the article into the hot forging Processes, it has to be heated to certain temperatures. The minimum temperature that has to be given to the article should be 200°C.
Q. What is the maximum temperature that can should be given before hot forging Process?
A. 150°C
B. 200°C
C. 250°C
D. 300°C
.
..Answer: D
Explanation: Process In impression die forging, when any article has to be hot forged, it has to first be heated to bring at a certain temperature. The maximum temperature that can be provided for hot forging is 300°C.
Q. Impression die forging is used only for multiple-pass Process.
A. True
B. False
.
.Answer: B
Explanation: Process In impression die forging, there are two types of pass Processes, one is single-pass Process and another is multiple-pass Process. Multiple-pass Process includes final stamping Process in it.
Q. Cold impression die forging is suited for mass production.
A. True
B. False
.
.Answer: B
Explanation: Process Cold impression die forging is the most unsuited way of production when it comes to long productions or mass amounts of manufacturing. This is because in cold impression die forging, there is a need of complex and expensive dies, which end up making the Process unnecessarily costly.
