201. The percentage carbon content in wrought iron is about
0.02
0.1
2
0.4
✅ The correct answer is option A.
Engineering Materials MCQs
202. Inconel contains
65% nickel, 15% chromium and 20% iron
68% nickel, 29% copper and 3% other constituents
80% nickel and 20% chromium
80% nickel, 14% chromi
✅ The correct answer is option D.
203. Steel containing 0.8 to 1.5% carbon, is known as
mild steel
dead mild steel
medium carbon steel
high carbon steel
✅ The correct answer is option D.
204. Macro-structure of a material is, generally, examined by
naked eye
optical microscope
metallurgical microscope
X-ray techniques
✅ The correct answer is option A.
205. The casting ability of aluminium increases when __________ is added to aluminium.
copper
magnesium
silicon
lead and bismuth
✅ The correct answer is option C.
206. 18/8 stainless steel consists of
18% nickel and 8% chromium
18% chromium and 8% nickel
18% nickel and 18% chromium
8% nickel and 8% chrom
✅ The correct answer is option B.
207. Which of the following is an amorphous material?
Mica
Silver
Lead
Glass
✅ The correct answer is option D.
208. Grey cast iron has
carbon in the form of free graphite
high tensile strength
low compressive strength
all of these
✅ The correct answer is option A.
209. When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron.
cementite
free graphite
✅ The correct answer is option B.
210. In induction hardening, the depth of hardening is controlled by controlling the voltage.
Correct
Incorrect
✅ The correct answer is option A.