Mechanical Metallurgy — Part 2 MCQs with Explanations

cracj opening mode is the correct answer to “In fracture toughness characterised by K IC or J IC , I in the subscript indicates loading by”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

bend radius is the correct answer to “Springback in sheet metal bending depends upon”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-3, Q-5, R-2, S-1 is the correct answer to “Match the following failure/fracture observations in Group 1 with the likely deformation/process in Group 2 . Group 1 Group 2 P. Cup and cone 1. Creep failure Q. Beach marks 2. Brittle failure R. Clevage 3. Normal ductile failure S. Triple point cracking 4. Completely ductile failure 5. Fatigue failure”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P, Q is the correct answer to “The pressure required to maintain flow during indirect extrusion P. decreases with decreasing rate of the billet Q. Increases with increasing extrusion ratio R. is independent of the length of the billet S. is independent of the extrusion ratio”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

1012 is the correct answer to “The typical dislocation density (lines/cm 2 ) of a hot rolled material is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

hydraulic press is the correct answer to “Amongst the following equipments, the productivity is the maximum for”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-4, Q-1, R-3, S-2 is the correct answer to “Match the loading conditions in Group 1 with the characteristics in Group 2 . Group 1 Group 2 P. Tensile 1. Barelling Q. Compressive 2. Intergrannular cracking R. Fatigue 3. Striations S. Creep 4. Cup and cone 5. Earing”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

90 is the correct answer to “A 480 mm thick slab is hot-rolled using a roll of 720 mm diameter. For a coefficient of friction of 0.5, the maximum possible reduction (in mm) is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

a is true and r is also true, and r is the reason for a is the correct answer to “Determine the correctness or otherwise of the following Assertion (a) and Reason (r) . Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load. Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-3, Q-5, R-1 is the correct answer to “Match the terms in Group 1 to their descriptions in Group 2 . Group 1 Group 2 P. Hall-Petch effect 1. Solute dislocation interaction Q. Bauschinger effect 2. Dislocation multiplication R. Cottreli atmosphere 3. Grain boundary strengthening 4. Barelling under compression 5. Mechanical hysterisis during plasticity”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

decarburisation is the correct answer to “Fatigue resistance of a steel is reduced by”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

is excess material that has been squirted out of the die is the correct answer to “Flash in a close die forging.”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-3, Q-1, R-4, S-2 is the correct answer to “Match the stress state with the corresponding forming process. P. Direct compressive 1. Wire drawing Q. Indirect compressive 2. Sheet blanking R. Tensile 3. Forging S. Shear 4. Stretch forming”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

bending the part to a smaller than desired radius of curvature is the correct answer to “The spring back phenomenon in metal sheet bending can be compensated by”. 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 items in Group 1 with the manufacturing processes in Group 2 . Group 1 Group 2 P. Upsetting operation 1. Extrusion Q. Port hole die 2. Forging R. Bullblock 3. Rolling S. Orange peel effect 4. Wire drawing 5. Deep drawing 6. Sheet forming”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

Redundant work is a function of die angle is the correct answer to “In extrusion of metals, which of the following statement(s) is/are true”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-3, R-1, S-4 is the correct answer to “Match the defects listed in Group I with the processes listed in Group II . Group I Group II P. Cold Shut 1. Rolling Q. Earing 2. Forging R. Alligatoring 3. Deep drawing S. Shrinkage porosity 4. Fusion welding”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-3, R-4, S-1 is the correct answer to “Match the manufacturing process of Group I to be used for producing the product for Group II . Group I Group II P. Drawing 1. Large curved disc Q. Forging 2. Tube R. Rolling 3. Crank shaft S. Stretch forming 4. Plate”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

0 is the correct answer to “An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

105 MPa is the correct answer to “The flow stress (σ) of an alloy varies with strain rate $$\left( \in \right)$$ as σ = 100 $${\left( \in \right)^{0.1}}$$ MPa. When the alloy is hot extruded from 10cm diameter to 5 cm diameter at a speed of 2 cm/s, the flow stress is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

friction angle should be greater than the angle of bite is the correct answer to “For successful rolling, the condition required is”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

26.4 is the correct answer to “A metal powder with an apparent density of 2.5 g/cm 3 was compacted in a cylindrical die to a green density of 5.5 g/cm 3 , If the height of the green sample was 12 mm, then the fill height of powder (in mm) would have been”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

powder metallurgy and deep drawing is the correct answer to “Tungsten filament wire for lamp industry is commonly produced by”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-1, Q-2, R-4, S-3 is the correct answer to “Match the following: Group 1 Group 2 P. Direct extrusion 1. Motion of ram and work piece in the same direction Q. Impact extrusion 2. Motion of ram and work pieces in the opposite direction R. Tube drawing 3. No containerwall friction S. Hydrostatic extrusion 4. Use of mandrel”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

hot reduction of a slab directly to strip is the correct answer to “A planetary mill is used for”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

75 mm is the correct answer to “An aluminium billet of 300 mm diameter is extruded with an extrusion ratio of 16. What is the diameter of the final product”. 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 process with the property required. P. Cold rolling 1. Wettability Q. Milling 2. Ductility R. Brazing 3. Comparability S. Powder metallurgy 4. Machinability”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-3, Q-4, R-2, S-1 is the correct answer to “Match the phenomenon with typically observed features P. Fatigue fracture 1. Earing Q. Yield point phenomenon 2. Dimple structure R. Ductile fracture 3. Beach marks S. Deep drawing of a sheet 4. Luder's band”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

650 MPa is the correct answer to “The strain hardening behaviour of an annealed rod during cold rolling is given by σ = 700 $${\left( \in \right)^{0.2}}$$ MPa. where σ is the flow stress at strain $$ \in $$. Flow stress after 50% reduction in area of the annealed rod on cold rolling is approximately”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-3, Q-1, R-4, S-5 is the correct answer to “Match the following: P. Forging 1. Rails Q. Rolling 2. Plane wires R. Extrusion 3. Crankshaft S. Deep drawing Product 4. Toothpaste tube 5. LPG cylinder”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.

P-2, Q-3, R-4, S-1 is the correct answer to “Match the items in Group 1 with the manufacturing process in Group 2 . Group 1 Group 2 P. I-section for structural work 1. Forging Q. Base plates for heavy machines 2. Rolling R. Self lubricating bearings 3. Casting S. Rotor for turbine 4. Powder metallurgy 5. Extrusion”. This question is standard in competitive examination syllabi for Mechanical Metallurgy.