21. 18-4-1 high speed steel contains
vanadium 4%, chromium 18% and tungsten 1%
vanadium 1%, chromium 4% and tungsten 18%
vanadium 18%, chromium 1% and tungsten 4%
none of the above
✅ The correct answer is option B.
Engineering Materials MCQs
22. A steel alloy containing 36% nickel is called
stainless steel
high speed steel
invar
heat resisting steel
✅ The correct answer is option C.
23. The compressive strength of cast iron is __________ that of its tensile strength.
equal to
less than
more than
✅ The correct answer is option C.
24. The red flame during the operation of a bessemer converter indicates that the
air is burning out silicon and manganese
silicon and manganese has burned out and carbon has started oxidising
converter must be tilted to remove the contents of the converter
red flame does not occ
✅ The correct answer is option D.
25. There are fourteen atoms in a unit cell of
body centred cubic space lattice
face centred cubic space lattice
close packed hexagonal space lattice
none of these
✅ The correct answer is option B.
26. The maximum solubility of carbon in austenite is 1.7% at 1130° C.
Yes
No
✅ The correct answer is option A.
27. The heat treatment process used for castings is
carburising
normalising
annealing
tempering
✅ The correct answer is option B.
28. Bronze is an alloy of
copper and zinc
copper and tin
copper, tin and zinc
none of these
✅ The correct answer is option B.
29. Thermosetting plastics are those materials which
are formed into shape under heat and pressure and results in a permanently hard product
do not become hard with the application of heat and pressure and no chemical change occurs
are flexible and can withstand considerable wear under suitable conditions
are used as a friction
✅ The correct answer is option A.
30. The material in which the atoms are arranged chaotically, is called
amorphous material
mesomorphous material
crystalline material
none of these
✅ The correct answer is option A.