181. Which of the following iron exists at 910° C?
α-iron
β-iron
γ-iron
δ-iron
✅ The correct answer is option A.
Engineering Materials MCQs
182. Which of the following is a mesomorphous material?
Mica
Silver
Lead
Brass
✅ The correct answer is option A.
183. The strength is the ability of a material to resist
deformation under stress
externally applied forces with breakdown or yielding
fracture due to high impact loads
none of these
✅ The correct answer is option B.
184. Which of the following steel making process is being adopted at Rourkela Steel Plant?
Bessemer process
Open-hearth process
Electric process
L-D process
✅ The correct answer is option D.
185. For the pipe fitting like elbow, tee, union etc., which of the following is preferred?
Pig iron
Malleable iron
Spheroidal graphite cast iron
High carbon steel
✅ The correct answer is option B.
186. The stiffness is the ability of a material to resist
deformation under stress
fracture due to high impact loads
externally applied forces with breakdown or yielding
none of the above
✅ The correct answer is option A.
187. Monel metal 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 B.
188. The essential constituent of a hardened steel is
pearlite
austenite
martensite
troostite
✅ The correct answer is option C.
189. The addition of magnesium to cast iron increases its
hardness
ductility and strength in tension
corrosion resistance
creep strength
✅ The correct answer is option B.
190. Pearlite is a combination of 87% ferrite and 13% cementite.
Yes
No
✅ The correct answer is option A.