171. The carbon in the pig iron varies from
0.1 to 0.5%
0.5 to 1%
1 to 5%
5 to 10%
✅ The correct answer is option C.
Engineering Materials MCQs
173. Which of the following statement is true about brittle fracture?
High temperature and low strain rates favour brittle fracture
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
Brittle fracture is always preceded by noise
Cup and cone formation
✅ The correct answer is option B.
174. Killed steels
have minimum impurity level
are produced by L-D process
have almost zero percentage of phosphorus and sulphur
are free from oxygen
✅ The correct answer is option D.
175. The steel produced by cementation process is known as __________ steel.
blister
crucible
✅ The correct answer is option A.
176. Beryllium bronze has
high yield point
high fatigue limit
both (a) and (b)
none of these
✅ The correct answer is option C.
177. Which of the following statement is incorrect about duralumin?
It is prone to age hardening
It can be forged
It has good machining properties
It is lighter than pur
✅ The correct answer is option D.
178. Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
Silicon
Sulphur
Manganese
Phosphorus
✅ The correct answer is option A.
179. Cementite consist of
13% carbon and 87% ferrite
13% cementite and 87% ferrite
13% ferrite and 87% cementite
6.67% carbon and 93.33
✅ The correct answer is option D.
180. A steel with 0.8% carbon and 100% pearlite is called
eutectoid steel
hypo-eutectoid steel
hyper-eutectoid steel
none of these
✅ The correct answer is option A.