1921. The purpose of nitriding the steel is to
Harden its surface
Soften its surface
Improve its reliability
None of these
✅ The correct answer is option A.
Chemical Engineering
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1922. Ceramic materials
Are exemplified by clay and mica
Are poor electrical conductors due to lack of free electrons
Never exhibit polymorphism
All of the above
✅ The correct answer is option D.
1923. With increase in carbide/graphite ratio in cast iron, its
Hardness & brittleness increases
Ductility decreases
Both A & B
Neither A nor B
✅ The correct answer is option C.
1924. Presence of high amount of silicon in cast iron
Suppresses the decomposition of Fe₃ C
Increases the formation of graphite
Increases the contraction of the metal
Reduces its fluidity
✅ The correct answer is option B.
1925. Which of the following is not an alloy of copper and tin?
Bell metal
Gun metal
Admiralty gun metal
Monel metal
✅ The correct answer is option D.
1926. Which of the following is a light alloy?
Monel metal
Dow metal
German silver
Babbit metal
✅ The correct answer is option B.
1927. Which one is remelted and poured into moulds to get cast iron?
Wrought iron
Pig iron
Low carbon steel
Mild steel
✅ The correct answer is option B.
1928. The range of Mho’s scale of hardness is from
1 to 15
1 to 8
1 to 10
0 to 10
✅ The correct answer is option C.
1929. Aluminium storage vessel can be used to store
Aqua regia
Ferrous sulphate
Hydrochloric acid (10%)
None of these
✅ The correct answer is option D.
1930. Which of the following has the poorest wel-dability?
Low carbon steel
Mild steel
Wrought iron
High-carbon steel
✅ The correct answer is option D.