Mechanical Metallurgy MCQ

Test your knowledge with important Mechanical Metallurgy MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Mechanical Metallurgy MCQs at Bissoy

• Match the items in Group 1 with the manufacturing process in Group 2.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group 1</strong></td> <td><strong>Group 2</strong></td> </tr> <tr> <td>P. I-section for structural work</td> <td>1. Forging</td> </tr> <tr> <td>Q. Base plates for heavy machines</td> <td>2. Rolling</td> </tr> <tr> <td>R. Self lubricating bearings</td> <td>3. Casting</td> </tr> <tr> <td>S. Rotor for turbine</td> <td>4. Powder metallurgy</td> </tr> <tr> <td></td> <td>5. Extrusion</td> </tr></table> P-2, Q-3, R-4, S-1

  খ

  P-5, Q-4, R-2, S-3

  গ

  P-1, Q-3, R-5, S-4

  ঘ

  P-4, Q-1, R-3, S-5
• 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 $$ \in $$.<br>Flow stress after 50% reduction in area of the annealed rod on cold rolling is approximately
  ক

  750 MPa

  খ

  650 MPa

  গ

  609 MPa

  ঘ

  559 MPa
• Match the phenomenon with typically observed features<br>
  ক

  <table class="table-style-1"> <tr> <td>P. Fatigue fracture</td> <td>1. Earing</td> </tr> <tr> <td>Q. Yield point phenomenon</td> <td>2. Dimple structure</td> </tr> <tr> <td>R. Ductile fracture</td> <td>3. Beach marks</td> </tr> <tr> <td>S. Deep drawing of a sheet</td> <td>4. Luder's band</td> </tr></table> P-3, Q-4, R-2, S-1

  খ

  P-3, Q-4, R-1, S-2

  গ

  P-4, Q-3, R-2, S-1

  ঘ

  P-4, Q-1, R-2, S-3
• Match the process with the property required.<br>
  ক

  <table class="table-style-1"> <tr> <td>P. Cold rolling</td> <td>1. Wettability</td> </tr> <tr> <td>Q. Milling</td> <td>2. Ductility</td> </tr> <tr> <td>R. Brazing</td> <td>3. Comparability</td> </tr> <tr> <td>S. Powder metallurgy</td> <td>4. Machinability</td> </tr></table> P-2, Q-1, R-3, S-4

  খ

  P-1, Q-2, R-4, S-3

  গ

  P-2, Q-1, R-4, S-3

  ঘ

  P-4, Q-3, R-2, S-1
• An aluminium billet of 300 mm diameter is extruded with an extrusion ratio of 16. What is the diameter of the final product?
  ক

  150 mm

  খ

  75 mm

  গ

  59 mm

  ঘ

  19 mm
• A planetary mill is used for
  ক

  hot reduction of a slab directly to strip

  খ

  grinding ceramic powders to a very fine mesh

  গ

  reduction gear in a pulley system

  ঘ

  rotary kiln assembly in cement production
• Tungsten filament wire for lamp industry is commonly produced by
  ক

  powder metallurgy and deep drawing

  খ

  powder metallurgy and welding

  গ

  casting and welding

  ঘ

  casting and forging
• A metal powder with an apparent density of 2.5 g/cm³ was compacted in a cylindrical die to a green density of 5.5 g/cm³, If the height of the green sample was 12 mm, then the fill height of powder (in mm) would have been
  ক

  26.4

  খ

  18.6

  গ

  42.8

  ঘ

  56.8
• For successful rolling, the condition required is
  ক

  friction angle should be greater than the angle of bite

  খ

  friction angle should be less than the angle of bite

  গ

  friction angle should be equal to the angle bite

  ঘ

  sum of the friction angle and the angle of bite should be equal to the neutral angle
• 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
  ক

  1000 MPa

  খ

  105 MPa

  গ

  150 MPa

  ঘ

  1050 MPs
• An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is
  ক

  0

  খ

  60

  গ

  30

  ঘ

  20
• Match the manufacturing process of Group I to be used for producing the product for Group II.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group I</strong></td> <td><strong>Group II</strong></td> </tr> <tr> <td>P. Drawing</td> <td>1. Large curved disc</td> </tr> <tr> <td>Q. Forging</td> <td>2. Tube</td> </tr> <tr> <td>R. Rolling</td> <td>3. Crank shaft</td> </tr> <tr> <td>S. Stretch forming</td> <td>4. Plate</td> </tr></table> P-2, Q-3, R-4, S-1

  খ

  P-1, Q-4, R-3, S-2

  গ

  P-3, Q-2, R-1, S-4

  ঘ

  P-4, Q-1, R-2, S-3
• Match the defects listed in Group I with the processes listed in Group II.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group I</strong></td> <td><strong>Group II</strong></td> </tr> <tr> <td>P. Cold Shut</td> <td>1. Rolling</td> </tr> <tr> <td>Q. Earing</td> <td>2. Forging</td> </tr> <tr> <td>R. Alligatoring</td> <td>3. Deep drawing</td> </tr> <tr> <td>S. Shrinkage porosity</td> <td>4. Fusion welding</td> </tr></table> P-2, Q-4, R-1, S-4

  খ

  P-2, Q-4, R-3, S-1

  গ

  P-2, Q-3, R-1, S-4

  ঘ

  P-4, Q-1, R-2, S-3
• In extrusion of metals, which of the following statement(s) is/are true?
  ক

  Speed of the extruded material is the same as that of ram speed

  খ

  Redundant work is a function of die angle

  গ

  Relative motion between the billet surface and the container wall is always present

  ঘ

  Hollow ram is used for indirect extrusion
• Match the items in Group 1 with the manufacturing processes in Group 2.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group 1</strong></td> <td><strong>Group 2</strong></td> </tr> <tr> <td>P. Upsetting operation</td> <td>1. Extrusion</td> </tr> <tr> <td>Q. Port hole die</td> <td>2. Forging</td> </tr> <tr> <td>R. Bullblock</td> <td>3. Rolling</td> </tr> <tr> <td>S. Orange peel effect</td> <td>4. Wire drawing</td> </tr> <tr> <td></td> <td>5. Deep drawing</td> </tr> <tr> <td></td> <td>6. Sheet forming</td> </tr></table> P-2, Q-6, R-3, S-1

  খ

  P-5, Q-2, R-1, S-6

  গ

  P-4, Q-6, R-3, S-3

  ঘ

  P-2, Q-1, R-4, S-5
• The spring back phenomenon in metal sheet bending can be compensated by
  ক

  bending the part to a smaller than desired radius of curvature

  খ

  bottoming the punch in a die

  গ

  using low temperature bending

  ঘ

  using high viscosity lubricant
• Match the stress state with the corresponding forming process.<br>
  ক

  <table class="table-style-1"> <tr> <td>P. Direct compressive</td> <td>1. Wire drawing</td> </tr> <tr> <td>Q. Indirect compressive</td> <td>2. Sheet blanking</td> </tr> <tr> <td>R. Tensile</td> <td>3. Forging</td> </tr> <tr> <td>S. Shear</td> <td>4. Stretch forming</td> </tr></table> P-3, Q-1, R-2, S-4

  খ

  P-1, Q-2, R-3, S-4

  গ

  P-4, Q-3, R-2, S-1

  ঘ

  P-3, Q-1, R-4, S-2
• Flash in a close die forging.
  ক

  is excess material that has been squirted out of the die

  খ

  is to provide excess temperature to the material

  গ

  helps in filling all the recesses in the die

  ঘ

  is always of uniform cross-sectional area
• Fatigue resistance of a steel is reduced by
  ক

  decarburisation

  খ

  polishing the surface

  গ

  reducing the grain size

  ঘ

  shot peening
• Match the terms in Group 1 to their descriptions in Group 2.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group 1</strong></td> <td><strong>Group 2</strong></td> </tr> <tr> <td>P. Hall-Petch effect</td> <td>1. Solute dislocation interaction</td> </tr> <tr> <td>Q. Bauschinger effect</td> <td>2. Dislocation multiplication</td> </tr> <tr> <td>R. Cottreli atmosphere</td> <td>3. Grain boundary strengthening</td> </tr> <tr> <td></td> <td>4. Barelling under compression</td> </tr> <tr> <td></td> <td>5. Mechanical hysterisis during plasticity</td> </tr></table> P-3, Q-5, R-1

  খ

  P-1, Q-4, R-3

  গ

  P-5, Q-1, R-2

  ঘ

  P-3, Q-4, R-2
• Determine the correctness or otherwise of the following Assertion (a) and Reason (r).<br>Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load.<br>Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.
  ক

  a is false but r is true

  খ

  a is true and r is also true, but r is not the reason for a

  গ

  a is true and r is also true, and r is the reason for a

  ঘ

  a is true but r is false
• 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
  ক

  90

  খ

  180

  গ

  240

  ঘ

  360
• Extrusion pressure is proportional to
  ক

  fractional reduction in area (r)

  খ

  extrusion ratio (R)

  গ

  natural logarithm of r

  ঘ

  natural logarithm of R
• Match the loading conditions in Group 1 with the characteristics in Group 2.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group 1</strong></td> <td><strong>Group 2</strong></td> </tr> <tr> <td>P. Tensile</td> <td>1. Barelling</td> </tr> <tr> <td>Q. Compressive</td> <td>2. Intergrannular cracking</td> </tr> <tr> <td>R. Fatigue</td> <td>3. Striations</td> </tr> <tr> <td>S. Creep</td> <td>4. Cup and cone</td> </tr> <tr> <td></td> <td>5. Earing</td> </tr></table> P-4, Q-5, R-3, S-1

  খ

  P-4, Q-1, R-3, S-2

  গ

  P-5, Q-1, R-4, S-2

  ঘ

  P-1, Q-2, R-3, S-2
• Amongst the following equipments, the productivity is the maximum for
  ক

  gravity hammer

  খ

  hydraulic press

  গ

  mechanical press

  ঘ

  screw press
• The typical dislocation density (lines/cm²) of a hot rolled material is
  ক

  10²

  খ

  10¹²

  গ

  10⁶

  ঘ

  10⁹
• The pressure required to maintain flow during indirect extrusion<br>P. decreases with decreasing rate of the billet<br>Q. Increases with increasing extrusion ratio<br>R. is independent of the length of the billet<br>S. is independent of the extrusion ratio
  ক

  P, Q

  খ

  Q, R

  গ

  R, S

  ঘ

  P, S
• Match the following failure/fracture observations in Group 1 with the likely deformation/process in Group 2.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group 1</strong></td> <td><strong>Group 2</strong></td> </tr> <tr> <td>P. Cup and cone</td> <td>1. Creep failure</td> </tr> <tr> <td>Q. Beach marks</td> <td>2. Brittle failure</td> </tr> <tr> <td>R. Clevage</td> <td>3. Normal ductile failure</td> </tr> <tr> <td>S. Triple point cracking</td> <td>4. Completely ductile failure</td> </tr> <tr> <td></td> <td>5. Fatigue failure</td> </tr></table> P-4, Q-1, R-5, S-2

  খ

  P-3, Q-5, R-2, S-1

  গ

  P-5, Q-4, R-1, S-2

  ঘ

  P-3, Q-2, R-5, S-1
• Springback in sheet metal bending depends upon
  ক

  elastic limit

  খ

  bend radius

  গ

  degree of bend

  ঘ

  thickness of sheet
• In fracture toughness characterised by K_IC or J_IC, I in the subscript indicates loading by
  ক

  cracj opening mode

  খ

  forward shear mode

  গ

  parallel shear mode

  ঘ

  perpendicular shear mode