Mechanical Metallurgy — Part 1 MCQs with Explanations

just before fracture is the correct answer to “In a tensile test of ductile material, necking starts at”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

$$5 + \frac{{\sigma 3}}{2}$$ is the correct answer to “A metallic sheet 1 m wide and 10 mm thick is to be rolled under a front tension force of 100 KN. A specimen from the sheet, tested under tension, shows a yield stress of 100 MPa. Assume plain strain condition during rolling and ignore the friction. If yielding is assumed to start at a roll pressure of σ3 MPa, then the stress in the width direction (where strain is zero) is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-1, Q-2, R-3 is the correct answer to “Match the forming methods in Group 1 with the defects in Group 2 . Group 1 Group 2 P. Extrusion 1. Flash cracking Q. Closed die forging 2. Fir-tree cracking R. Rolling 3. Alligatoring 4. Earing”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

the centre is the correct answer to “The maximum axial compression stress during cold upsetting of a cylindrical rod of radius, 'r', occurs at”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Q, T is the correct answer to “The defects that are not observed in extruded products are P. Chevron cracking Q. Fold R. Piping S. Surface cracking T. Alligatoring”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Deep drawing is the correct answer to “Which of the following metal forming techniques is used to produce soft drink cans from aluminium sheets”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-1, R-4, S-3 is the correct answer to “Match the defects listed in Group I with the corresponding manufacturing process listed in Group II . Group I Group II P. Orange-peel effect 1. Extrusion Q. Chevron cracking 2. Deep drawing R. Flash 3. Arc welding S. Undercut 4. Forging”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Rolling is the correct answer to “Railway tracks are typically manufactured using”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

rods is the correct answer to “The rolling process can not be used to produce”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

carbon is the correct answer to “The yield point phenomenon observed in annealed low carbon steels is due to the presence of”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-1, R-4, S-5 is the correct answer to “Match the product in Group 1 and the main manufacturing process in Group 2 . Group 1 Group 2 P. Cement kilns 1. Rolling and welding Q. Gas pipelines 2. Casting and welding R. Cycle rims 3. Forging and welding S. Seamless pipe 4. Extrusion and welding 5. Forging and extrusion”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

increasing compressive surface residual stresses is the correct answer to “Fatigue strength of steel can be'increased by”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Extrusion is the correct answer to “Which of the following metal working operations can be categorized as an indirect compression process”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Recrystallisation temperature is the correct answer to “Classification of metal forming processes into hot and cold working is based on the following parameter.”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

decreases exponentially is the correct answer to “As the % reduction increases, the flow stress during hot isothermal forging of a metal”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

starting sheet has planer anisotropy due to its texture is the correct answer to “Often earing defects are found during deep drawing operation, because the”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

The co-efficient of friction should exceed the tangent of the contact angle is the correct answer to “For the occurence of "bite" in rolling, the following condition should be satisfied.”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Q, S is the correct answer to “For ingot breakdown by hot rolling, the rolls are generally grooved paralled to the roll axis in order to P. increase the arigle of bite Q. decrease the rolling load R. achieve larger reduction S. decrease roll flattening”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

It is mechanical deformation carried out above the temperature of recrystallisation is the correct answer to “Identify the statement that precisely describes the principle of hot working of metals and alloys.”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

25 is the correct answer to “The co-efficient of friction alters by 5 times when a slab is hot rolled instead of cold rolling in a specific rolling mill. The maximum reduction in the thickness of the slab will increase by a factor of”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Deep drawing is the correct answer to “Which one of the following metal forming processes is the earing defect associated with”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

0.26 is the correct answer to “From a 2 m × 1.2m sheet, squares are Cut out from each of the four comers as shown in the figure and then the sides are bent to form an open box. The maximum possible volume (in m 3 ) of the box is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-4, Q-3, R-2, S-1 is the correct answer to “Match the following products to their method of manufacture. P. Seamless tubes 1. Deep drawing Q. Aluminium toothpaste tubes 2. Stamping R. Currency coins 3. Impact extrusion S. Car bodies 4. Roll piercing or extrusion”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

high plastic anisotropy and high planer anisotropy is the correct answer to “For ideal defect free deep drawability of material, it should have”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-3, Q-4, R-1, S-2 is the correct answer to “Match the mechanical behaviour in Group 1 with the terms in Group 2 . Group 1 Group 2 P. Low cycle fatigue 1. Charpy test Q. Creep 2. Portevin-LeChatelier effect R. Impact toughness 3. Coffin-Manson equation S. Stretcher strains 4. Larson-Miller parameter 5. Jominy test”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

the end of the plate corresponding to the thicker part of the wedge is the correct answer to “A wedge shaped piece of copper is plastically deformed to a plate of uniform thickness. The finest recrystallised grains will be observed at”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

duralumin sheets is the correct answer to “In sheet metal forming, stretcher strains occur in”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Edge cracking is the correct answer to “Which of the following is a typical rolling defect”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Deep drawing is the correct answer to “Earing is a defect found in steels after the following metal working operation (s)”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-1, Q-2, R-3, S-4 is the correct answer to “Identify the correct metal forming operations in Group 1 with the product in Group 2 . Group 1 Group 2 P. Drawing 1. Tailoring needles Q. Cold forging 2. Beverage cans R. Extrusion 3. Radiator caps S. Swaging 4. Steel half domes”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Four stand continuous mill is the correct answer to “For the manufacture of thin foil of aluminium, the following rolling mill is used:”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

1 is the correct answer to “If a cylindrical billet of height 1.0 m and diameter 0.5 m is upset forged to form a cylindrical pancake of height 0.25 m, the diameter of the pancake (in m) is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

crack is the correct answer to “The most serious manufacturing defect from fracture toughness point of view is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-1, R-4, S-3 is the correct answer to “Match the processes given in Group 1 with corresponding typical defects in Group 2 . Group 1 Group 2 P. Forging 1. Alligatoring Q. Rolling 2. Cold shut R. Deep drawing 3. Chevron Cracks S. Extrusion 4. Wrinkles”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-1, R-3, S-4 is the correct answer to “Match the deformation processes in Column I with the corresponding stress states listed in Column II . Column I Column II P. Wire Drawing 1. Direct Compression Q. Forging 2. Indirect Compression R. Stretch Forming 3. Tension S. Cutting 4. Shear”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-1, R-3 is the correct answer to “Match the fracture processes in Group 1 to the fracture surface morphologies in Group 2 . Group 1 Group 2 P. Ductile fracture 1. Clevage Q. Brittle fracture 2. Dimples R. Fatigue fracture 3. Striations 4. Veins”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

2 is the correct answer to “The maximum possible reduction in a single pass for cold rolling of a 200 mm slab is (given the co-efficient of friction 0.1 and roll diameter is 400 mm) . . . . . . . . mm.”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

heat treatment for drawn wires is the correct answer to “Patenting process is a”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-4, Q-2, R-1, S-3 is the correct answer to “Match the following components with their method of production. P. Automobile crankshaft 1. Powder metallurgy Q. Boiler drum 2. Submerged arc welding R. Tungsten 3. Extrusion S. Seamless tube 4. Forging”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

30 is the correct answer to “A steel plate of 10 mm thickness is to be cold rolled. The mill has rolls of diameter 72 mm. If the co-efficient of friction μ = 0.3 the maximum possible thickness reduction in the first pass will approximately be . . . . . . . . %.”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.