2109. Work hardening of a material
Decreases its tensile strength
Decreases its ductility
Increases its ductility
Does not affect its ductility
✅ The correct answer is option B.
2111. Dies for wire drawing are generally made of
Mild steel
Stainless steel
Carbides
High carbon steel
✅ The correct answer is option C.
2113. Lead alone is not used in storing equipment, because it
Is very costly
Corrodes easily
Is having low creep strength
None of these
✅ The correct answer is option C.
2115. Maximum consumption of lead is in the manufacture of
Storage batteries
Solder alloys
Electric cable sheathing
Lead lined vessels
✅ The correct answer is option A.
2117. Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.
Bismuth
Arsenic
Antimony
Both B and C
✅ The correct answer is option D.
2120. Sulphuric acid pickling tanks are lined with
Nickel
Rubber
Aluminium
Glass
✅ The correct answer is option B.
2123. Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property?
Silicon
Phosphorus
Sulphur
None of these
✅ The correct answer is option A.
2126. Alpha iron is stable __________ °C.
Above 1403
Upto 910
Above 1800
Between 910 & 1403
✅ The correct answer is option B.
2129. __________ can replace tungsten in high speed steel,
Chromium
Vanadium
Cobalt
Molybdenum
✅ The correct answer is option D.
2132. Which of the following is not a nickel based alloy?
Inconel
Hastelloys
Nimonics
Babbit metal
✅ The correct answer is option D.