Metals MCQ

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

• If the gap between the rolls is not perfectly flat, which of the following defect can arise from this demerit?
  ক

  Alligatoring

  খ

  Waviness in the sheet

  গ

  Centre burst

  ঘ

  Stretcher strain
• There is no limit of the possible reduction in the thickness of the sheet metal, provided number of passes needs to increase.
  ক

  True

  খ

  False
• The mill spring in the rolling mill is defined as the phenomena of _____________
  ক

  recoiling of the roll wheel

  খ

  increase in thickness of rolled sheet after coming out of roll wheel

  গ

  roll flattening

  ঘ

  change in the gap distance between the rolls with time
• A roll of diameter 1.5 m is used to roll the sheet of width 100 mm. Find the stress on the machine, if the change in thickness of the sample is 10 mm. Given that the rolling pressure is 500 kN?
  ক

  50 MPa

  খ

  40.9 MPa

  গ

  568.2 kPa

  ঘ

  48.2 MPa
• A roll of diameter 1.5 m is used to roll the sheet of width 100 mm. The stress on the machine is 50 MPa, and the change in thickness of the sample is 10 mm. Find the rolling pressure of the sheet?
  ক

  52.3 kN

  খ

  8258.5 kN

  গ

  612.3 kN

  ঘ

  5682.2 kN
• The neutral point always occurs in the mid-way of entering and exiting point of the metal along the arc of contact.
  ক

  True

  খ

  False
• The roll pressure is always maximum at the neutral point and then falls off sharply.
  ক

  True

  খ

  False
• For a roll of radius R, the entering and exiting material thickness is h1 and h2 respectively. What will be the total arc of contact between roll and material? Δh=h1-h2
  ক

  R(Δh)

  খ

  R(√Δh)

  গ

  √(RΔh)

  ঘ

  R(Δh)2
• The specific roll pressure is defined as _______________ in the rolling machine.
  ক

  total rolling load

  খ

  total load separating force

  গ

  rolling load/contact area

  ঘ

  rolling load/roll diameter
• The neutral point in the rolling machine is defined as the point where ________
  ক

  the material enters the machine

  খ

  the material exits the machine

  গ

  the roll speed is equal to the material flow speed

  ঘ

  the friction between the roll and the material is zero
• The velocity of the sheet in the rolling machine keeps on increasing from entering to exit from the rolls.
  ক

  True

  খ

  False
• A sheet with an initial thickness 30 mm is rolled in two high mills with entering velocity of 5 mm/sec. Find the final thickness of sheet if the exit velocity of rolled sheet is 25 mm/sec?
  ক

  6mm

  খ

  5 mm

  গ

  1 mm

  ঘ

  2.5 mm
• A sheet with an initial thickness 30 mm is rolled in two high mills with entering velocity of 5 mm/sec. If the final thickness of sheet is 15 mm find the exit velocity of rolled sheet?
  ক

  5mm/sec

  খ

  25mm/sec

  গ

  10mm/sec

  ঘ

  100mm/sec
• The passing of the rolled material through the square of oval-shaped cavity reduces the anisotropy of final material.
  ক

  True

  খ

  False
• The temper rolling or skin pass rolling is used to ___________
  ক

  improve surface finish

  খ

  eliminate the yield point phenomena

  গ

  improve fatigue strength

  ঘ

  refine the grain
• An ingot of 30mm thickness needs to reduce into sheet for further application. The best possible method to perform this task is _______
  ক

  hot rolling

  খ

  cold rolling

  গ

  extrusion

  ঘ

  compact extrusion
• In the given diagram, the sheet of thickness h1 is reduced to thickness h2. Find the correct relation between the velocity of the sheet? Where v1 is entering velocity and v2 is exiting velocity. Assuming the width of the sheet is constant.
  ক

  v1=v2

  খ

  v1>v2

  গ

  v1<v2

  ঘ

  no relation exists
• Which of the following mill action is like more of forging than the rolling of the metal?
  ক

  Two high mill

  খ

  Cluster mill

  গ

  Planetary mill

  ঘ

  Sendzimir mill
• Find the total number of rolls involved in 2 high four stand rolling mill?
  ক

  2

  খ

  4

  গ

  8

  ঘ

  16
• The significant advantage of using smaller rolls in the machine is that __________
  ক

  maximum possible reduction increases

  খ

  power consumption reduces

  গ

  the surface finish of the rolled product improves

  ঘ

  the problem of roll flattening can be eliminated
• The total number of sheets which can be rolled together in a four high mill is equal to _________
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4
• The total number of rolls involved in a three-high mill is _______
  ক

  2

  খ

  3

  গ

  4

  ঘ

  10
• If the sheet is rolled along certain direction of rolling, the grain will deform in the sheet. The maximum deformation of grains occurs at the _____________
  ক

  centre of sheet

  খ

  surface of sheet

  গ

  beginning of sheet

  ঘ

  end of sheet
• A sheet of thickness 200 mm is rolled in a roller with roll diameter of 300 mm. If the coefficient of friction between the roll and sheet is 0.1. Find the minimum number of passes required to reduce the thickness of sheet to 180 mm?
  ক

  2

  খ

  5

  গ

  7

  ঘ

  9
• The following figure shows a rolled sheet (After rolling) The region A shows the end of plate and B shows the center of plate, the nature of forces in this region will be ________
  ক

  A-Compressive, B-Compressive

  খ

  A-Tensile, B-Tensile

  গ

  A-Tensile, B-compressive

  ঘ

  A-Compressive, B-Tensile
• Let angle of friction be equal to FA, and angle of bite be AB, the necessary condition for rolling to occur is ___________
  ক

  FA=AB

  খ

  FA>AB

  গ

  FA<AB

  ঘ

  Rolling occurs on every possible angle
• In the rolling of thick plates and sheets, the friction angle and angle of the bite are always equal to each other.
  ক

  True

  খ

  False
• In the case of four stands high mill, the diameter of the backing roll is ___________ the primary roll which remains in contact with workpiece.
  ক

  larger than

  খ

  smaller than

  গ

  same as

  ঘ

  depends upon the application
• If the thick slab needs to be directly reduced into thin sheet, which of the following is the best rolling mill to use?
  ক

  Two high mill

  খ

  Four high mill

  গ

  Planetary mill

  ঘ

  Continuous mill
• A roll diameter of 300 mm has a maximum possible reduction of 3 mm, find the angle of bite for the process?
  ক

  10.25

  খ

  5.71

  গ

  18.32

  ঘ

  89.25