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The correct answer is (b) Drawing down

The explanation is: 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.

The correct choice is (b) False

Easiest explanation: For the HOLDING of bolts or RIVETS or any other CIRCULAR section, a ring TONG is used, whereas a flat tong is used whenever a section having a rectangular shape has to be HELD.

Right answer is (b) 10^o

For explanation I would SAY: 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 10^o.

Correct option is (C) Jump weld

The best EXPLANATION: 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’.

Correct OPTION is (d) Punch

For explanation I would say: The following figure is that of a punch. A punch is a TYPE of a hand tool, when there is a HOLE to be made in a metal part, and when the metal is EXPERIENCING forging heat, a punch can be used.

Correct option is (b) False

The explanation: Swages are used for WORK where the articles need a good finishing in TERMS of shapes, such as round, square or pentagonal etc, whereas for the SMOOTHING purposes, flatters are HIGHLY used.

Correct choice is (B) False

Explanation: 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.

Right answer is (a) Lap weld

The best explanation: 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.

Correct answer is (c) Fuller

Explanation: The following figure is that of a fuller. Whenever a PIECE has to be necked down, a fuller is a highly RECOMMENDED object. FULLERS are MADE available in various shapes and sizes, according to the requirements.

The CORRECT choice is (a) True

Best explanation: 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.

The correct answer is (a) CYLINDRICAL

The explanation: 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.

Correct option is (a) True

The explanation is: 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.

Correct OPTION is (B) Quenching

Easiest explanation: 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.

The correct choice is (b) 850°C – 950°C

Explanation: 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.

Correct choice is (b) Handles

To explain I WOULD say: 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.

Right answer is (d) SPLIT weld

The best I can EXPLAIN: In butt welding, the MATERIALS are butted are TOGETHER. In split weld, the metals are KEPT like a fork in a ‘V’ shape.

The correct choice is (a) Upsetting

Best explanation: 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.

The correct option is (a) 2 parts of BORAX with one part of sal-ammoniac

Best explanation: 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.

Right answer is (c) 3^o

The EXPLANATION is: 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 3^o.

Correct choice is (a) Drift

For EXPLANATION: The FOLLOWING figure is that of a drift. A PUNCH is a type of a hand tool, when there is a hole to be made in a metal part, and when the metal is experiencing forging HEAT, a punch can be used, after the making the holes, when it needs to widen apart, a tapered punch is passes through it, called the drift.

The correct answer is (d) 300°C

The explanation: 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.

The correct CHOICE is (C) 200°C

For EXPLANATION: 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.

The correct option is (a) 850°C

For explanation I would say: 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.

Correct CHOICE is (b) 1270°C

The best I can explain: 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.

The correct CHOICE is (d) STRAIGHT pin

To EXPLAIN: None.

Correct OPTION is (B) BALL peen

The best explanation: None.

Correct answer is (d) 600°C

To explain I WOULD say: 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.

The CORRECT choice is (c) Sledge

Explanation: The following figure is that of a sledge. Sledges are GENERALLY OBSERVED to have a very big head area. This large area of the head ALLOWS the sledge to DISTRIBUTE its force over a wide area.

Right answer is (C) 1150°C

To EXPLAIN: 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.

The correct choice is (c) Set hammer

The explanation: The following figure is that of a set hammer. Whenever there are CORNERS that NEED to be SHOULDERED, it often becomes inconvenient to do it using other tools, here a set hammer plays an IMPORTANT role in shouldering it.

The correct option is (a) Cross peen

The best EXPLANATION: HAND tools are often used when the WORK needed to be done is very SHORT and can be done in small amount of time without the need of a machine, which would consume more energy and time. The following FIGURE is that of a hand tool called as cross peen.

The correct answer is (a) True

Explanation: 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.

Right answer is (b) 500°C

For EXPLANATION: 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.

The correct OPTION is (b) False

To elaborate: 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.