121. Very high sulphur in pig iron makes
Its casting unsound
Its hard and machinable
Its brittle and malleable
All of the above
✅ The correct answer is option A.
Materials and Construction MCQs
122. Cast iron is
Used for making shock resisting parts
Manufactured in cupola and is brittle
Having compressive strength more than its tensile strength
All of the above
✅ The correct answer is option D.
123. Tin coating on metals is not done by
Spraying
Powder metallurgy
Hot dipping
Electro-deposition
✅ The correct answer is option B.
124. Dry chlorine can be handled in a vessel made of
Iron or steel
PVC
Ickel
Brass
✅ The correct answer is option A.
125. Carbon supply in pack carburising process is in the form of
Charcoal
Calcium carbide
Hydrocarbon oil
Graphite
✅ The correct answer is option A.
126. The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
0.2
2
4
8
✅ The correct answer is option C.
127. Gun metal is an alloy of
Nickel, tin and copper
Copper, tin and zinc
Copper, phosphorus and nickel
Manganese, phosphorus and nickel
✅ The correct answer is option B.
128. A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.
5
100
250
500
✅ The correct answer is option A.
129. Brine solution is stored/treated in __________ lined vessels/pipes.
Rubber
Lead
Glass
Nickel
✅ The correct answer is option D.
130. High speed cutting tool steels contain about __________ percent of tungsten.
6-Aug
18-20
30-35
50-55
✅ The correct answer is option B.