151. 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.
Engineering Materials MCQs
152. 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.
153. 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.
154. Quenching is not necessary when hardening is done by
case hardening
flame hardening
nitriding
any one of these
✅ The correct answer is option C.
155. The addition of which of the following improves machining of copper?
Sulphur
Vanadium
Tin
Zinc
✅ The correct answer is option A.
156. The addition of manganese to aluminium improves corrosion resistance.
Correct
Incorrect
✅ The correct answer is option A.
157. 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.
158. The compressive strength of cast iron is __________ that of its tensile strength.
equal to
less than
more than
✅ The correct answer is option C.
159. 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.
160. A steel alloy containing 36% nickel is called
stainless steel
high speed steel
invar
heat resisting steel
✅ The correct answer is option C.