11. In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre.
Yes
No
✅ The correct answer is option A.
Engineering Materials MCQs
12. The process which improves the machinability of steels, but lowers the hardness and tensile strength, is
normalising
full annealing
process annealing
spheroidising
✅ The correct answer is option D.
13. In induction hardening __________ is high.
current
voltage
frequency
temperature
✅ The correct answer is option C.
14. The ductility is the property of a material due to which it
can be drawn into wires
breaks with little permanent distortion
can be rolled or hammered into thin sheets
can resist fracture du
✅ The correct answer is option A.
15. A steel containing 12 to 14% chromium and 0.12 to 0.35% carbon is called martensitic stainless steel.
TRUE
FALSE
✅ The correct answer is option A.
16. German silver contains
70% copper and 30% zinc
60% copper and 40% zinc
59% copper, 40% zinc and 1% tin
60.45% copper, 35.2% z
✅ The correct answer is option D.
17. Muntz metal (Yellow brass) contains
70% copper and 30% zinc
60% copper and 40% zinc
59% copper, 40% zinc and 1% tin
60.45% copper, 35.2% z
✅ The correct answer is option B.
18. Quenching is not necessary when hardening is done by
case hardening
flame hardening
nitriding
any one of these
✅ The correct answer is option C.
19. The addition of which of the following improves machining of copper?
Sulphur
Vanadium
Tin
Zinc
✅ The correct answer is option A.
20. The addition of manganese to aluminium improves corrosion resistance.
Correct
Incorrect
✅ The correct answer is option A.