41. In acidic bessemer process, the furnace is lined with
silica bricks
a mixture of tar and burnt dolomite bricks
either (a) or (b)
none of these
✅ The correct answer is option A.
Engineering Materials MCQs
42. When a low carbon steel is heated upto upper critical temperature
there is no change in grain size
the average grain size is a minimum
the grain size increases very rapidly
the grain size first i
✅ The correct answer is option B.
43. The iron ore mostly used for the production of pig iron is
magnetite
haematite
limonite
siderite
✅ The correct answer is option B.
44. In a unit cell of close packed hexagonal space lattice, there are twenty four atoms.
Correct
Incorrect
✅ The correct answer is option B.
45. The alloy, mainly used for corrosion resistance in stainless steels is
silicon
manganese
carbon
chromium
✅ The correct answer is option D.
46. A steel containing 16 to 18% chromium and about 0.12% carbon is called
ferritic stainless steel
austenitic stainless steel
martensitic stainless steel
nickel steel
✅ The correct answer is option A.
47. Which of the following display properties similar to that of steel?
Blackheart cast iron
Whiteheart cast iron
both (a) and (b)
none of these
✅ The correct answer is option C.
48. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
coordination number
atomic packing factor
space lattice
none of these
✅ The correct answer is option B.
49. A steel containing ferrite and pearlite is
hard
soft
tough
hard and tough
✅ The correct answer is option B.
50. The high speed steel has __________ percentage of tungsten.
maximum
minimum
✅ The correct answer is option A.