Dilute HC₁
Acetic acid
v
None of these
✅ The correct answer is option B.
Materials and Construction MCQs
422. Liners of a ball mill are never made of
Lead
Alloy steel
Rubber or ceramic material
Cast iron
✅ The correct answer is option A.
423. Alpha iron is stable __________ °C.
Above 1403
Upto 910
Above 1800
Between 910 & 1403
✅ The correct answer is option B.
424. Gunmetal and bronze are not corroded by the action of
Wet chlorine
Synthetic detergent solution
Hydrochloric acid (10%)
Nitric acid (< 25%)
✅ The correct answer is option B.
425. Wood is corroded by
Hydrochloric acid
SO₂ (dry or wet)
Chlorine (dry or wet)
All of the above
✅ The correct answer is option D.
426. __________ can replace tungsten in high speed steel,
Chromium
Vanadium
Cobalt
Molybdenum
✅ The correct answer is option D.
427. Brine (15% concentration) can be stored in a vessel made of
Monel
Karbate
Cast iron
None of these
✅ The correct answer is option A.
428. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?
Invar
Constantan
Chromel
Alumel
✅ The correct answer is option A.
429. Which of the following is not a nickel based alloy?
Inconel
Hastelloys
Nimonics
Babbit metal
✅ The correct answer is option D.
430. Carbon percentage in medium carbon steel is around
0.1 to 0.35
0.35 to 0.5
0.8 to 1.4
1 to 1. 5
✅ The correct answer is option B.