GATE PI
Metal Forming
Metal Forming Process
Previous Years Questions

Marks 1

A steel wire of $$2$$ $$mm$$ diameter is to be drawn from a wire of $$5mm$$ diameter. The value of true strain developed is _____________ (up to three...
The true stress at fracture of a tensile tested specimen, having an initial diameter of specimen at fracture is $$10$$ $$mm,$$ then the engineering st...
In rolling of a flat strip, the relative velocity of strip with respect to the roller is
The maximum reduction per pass during wire drawing of an aluminium alloy ignoring friction and redundant work is $$77\% $$. The strain hardening expo...
A moving mandrel is used in
In an open die forging, a circular disc is gradually compressed between two flat plates. The exponential decay of normal stress on the flat face of th...
In a rolling process, the state of stress of the material undergoing deformation is
A solid cylinder of diameter $$100$$ $$mm$$ and height $$50$$ $$mm$$ is forged between two frictionless flat dies to a height of $$25$$ $$mm.$$ The pe...
Cold shut (lap) may occur in products obtained by:
Hot die steel, used for large solid dies in drop forging, should necessarily have
Anisotropy in rolled components is caused by
Flash and gutter are provided in drop forging dies at the following stage:
Cold shut (lap) may occur in products obtained by:
In order to reduce roll pressure in strip rolling, back tension must be applied to strip.
In order to reduce roll pressure in strip rolling, back tension can be applied to strip.
Forces in hot extrusion is a function of the strain hardening component of the billet material.
Which one of the following manufacturing process requires the provision of 'gutters'
A moving mandrel is used in
Thread rolling is restricted to
Seamless long steel tubes are manufactured by rolling, drawing and .............
At $${1000^ \circ }C$$ the crystallographic structure of iron is ....................
Semi brittle materials can be extruded by
While rolling a strip the peripheral velocity of the roll is ..... A .... than the entry velocity of the strip and is ...... B .... the exit velocity ...
The blank diameter used in thread rolling will be
Collapsible tubes are made by
At the last hammer stroke the excess material from the finishing cavity of a forging die is pushed into .............

Marks 2

A metallic strip having a thickness of $$12$$ $$mm$$ is to be rolled using two steel rolls, each of $$800$$ $$mm$$ diameter. It is assumed that there ...
In a single-pass rolling operation, a $$200$$ $$mm$$ wide metalic strip is rolled from a thickness $$10$$ $$mm$$ to a thickness $$6$$ $$mm.$$ The roll...
Two solid cylinders of equal diameter have different heights. They are compressed plastically by a pair of rigid dies to create the same percentage re...
Open die forging of a cylinder made of a rigid perfectly plastic material with yield strength of $$200$$ $$MPa$$ having a height of $$25$$ $$mm$$ and ...
A $$80$$ $$mm$$ thick steel plate with $$400$$ $$mm$$ width is rolled to $$40mm$$ thickness in $$4$$ passes with equal reduction in each pass, by usin...
In a single pass rolling process using $$410mm$$ diameter steel rollers, a strip of width $$140mm$$ and thickness $$8mm$$ undergoes $$10\% $$ reductio...
The thickness of a plate is reduced from $$30$$ $$mm$$ to $$10$$ $$mm$$ by successive cold rolling passes using identical rolls of diameter $$600$$ $$...
In multi-pass operation, a round bar of $$10$$ $$mm$$ diameter and $$100$$ $$mm$$ length is reduced in cross-section by drawing it successively throug...
In multi-pass operation, a round bar of $$10$$ $$mm$$ diameter and $$100$$ $$mm$$ length is reduced in cross-section by drawing it successively throug...
In a rolling process, the roll separating force can be decreased by
During open die forging process using two flat and parallel dies, a solid steel disc of initial radius $$({R_{IN}})\,\,200mm$$ and Initial height $$({...
Using direct extrusion process, a round billet of $$100$$ $$mm$$ length and $$50mm$$ diameter is extruded. Considering an ideal deformation process (n...
In a rolling process, thickness of a strip is reduced from $$4mm$$ to $$3mm$$ using $$300mm$$ diameter rolls rotating at $$100rpm.$$ The velocity of t...
A $$10mm$$ diameter annealed steel wire is drawn through a die at a speed of $$0.5/sec$$ to reduce the diameter by $$20\% $$. The yield stress of the ...
By application of tensile force, the cross sectional area of bar $$' P '$$ is first reduced by $$30\% $$ and then by an additional $$20\% $$. Another ...
A $$10mm$$ diameter annealed steel wire is drawn through a die at a speed of $$0.5/sec$$ to reduce the diameter by $$20\% $$. The yield stress of the ...
The maximum possible percentage reduction in area per pass during wire drawing of an ideal plastic material without friction is of the order of
A copper strip of $$200$$ $$mm$$ width and $$30$$ $$mm$$ thickness is to be rolled to a thickness of $$25$$ $$mm.$$ The roll of radius $$300$$ $$mm$$ ...
A solid cylindrical stainless steel work piece of $$200mm$$ diameter and $$150mm$$ height. This component is reduced by $$50\% $$ in height with flat ...
A level having $${90^0}$$ bend is to be produced by drop forging using mild steel bar as raw material. The various operations to be performed on it du...
A round billet made of brass is to be extruded (extrusion constant $$=250$$ $$MPa$$ ) at $${700^ \circ }C.$$ The billet diameter is $$100$$ $$mm$$ and...
The true stress-true strain curve is given by $$\sigma = 1400\,{\varepsilon ^{0.33}},$$ where the stress $$\sigma $$ is in $$MPa.$$ The true stress a...
Assertion (A) : Cold working of metals result in increase of strength and hardness. Reason (R) : Cold working reduces the total number of dislocation...
Consider the following statements: In comparison to hot working, in cold working, $$1.$$ Higher forces are required $$2.$$ No heating is required $$3...
The extrusion process(es) used for the production of toothpaste tubes is / are $$1.$$ Tube extrusion $$2.$$ Forward extrusion $$3.$$ Impact extrusion...
Consider the following steps in forging a connecting rod from the bar stock $$1.$$ blocking $$\,\,\,\,\,\,\,\,\,$$ $$\,\,\,\,\,\,\,\,\,$$ $$\,\,\,\,\...
Cold working produces the following effects $$1.$$$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,$$ Stress are set up in the material $$2.$$$$\,\,\,\,\,\,\,\,\,\,\,\,...
An annealed copper wire of $$25 mm$$ diameter is drawn into a wire of $$5$$ $$mm$$ dia. The average yield stress in this operation if the flow curve o...
If the elongation factor during rolling of an ingot is $$1.22.$$ The minimum number of passes needed to produce a section $$250 \times 250\,\,mm$$ fro...
To stress relive a cold worked steel part, it is heated to a temp close to ..... A....... and grains obtained after cooling are........ B......... A....

Marks 5

In a single pass flat rolling operation, a $$400mm$$ wide steel strip having a thickness of $$10mm$$ is reduced to $$8mm$$ by using a roll of $$600mm$...
In a single pass flat rolling operation, a $$400$$ $$mm$$ wide steel strip having a thickness of $$10mm$$ is reduced to $$8$$ $$mm$$ by using a roll o...
Calculate the minimum number of hot rolling passes necessary to reduce an ingot of $$200mm$$ thickness to $$100mm$$ thickness in two high reversible r...
A steel wire of length $$100$$ $$m$$ and diameter $$12.214$$ $$mm$$ is drawn to a final diameter of $$10mm.$$ Tensile tests of specimen made before an...
A steel wire of length $$100$$ $$m$$ and diameter $$12.214$$ $$mm$$ is drawn to a final diameter of $$10mm.$$ Tensile tests of specimen made before an...
In a wire drawing operation diameter of $$6mm$$ is reduced in stages to a diameter of $$1.34mm.$$ Assuming ideally rigid plastic material and ideally ...
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