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MCQs

Total Questions : 1977 | Page 25 of 198 pages
Question 241. Copper is dissolved from its ore by H₂SO₄ in a percolation tank made of
  1.    Wood
  2.    Stainless steel
  3.    Reinforced concrete lined with lead
  4.    High silicon iron (14% Si)
 Discuss Question
Answer: Option C. -> Reinforced concrete lined with lead
Question 242. Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.
  1.    0.02
  2.    0.2
  3.    0.35
  4.    0.5
 Discuss Question
Answer: Option B. -> 0.2
Question 243. __________ iron is produced, when molten pig iron is allowed to cool gradually.
  1.    White cast
  2.    Grey cast
  3.    Wrought
  4.    None of these
 Discuss Question
Answer: Option B. -> Grey cast
Question 244. Alpha iron is stable __________ °C.
  1.    Above 1403
  2.    Upto 910
  3.    Above 1800
  4.    Between 910 & 1403
 Discuss Question
Answer: Option B. -> Upto 910
Question 245. Which of the following is not a nickel based alloy?
  1.    Inconel
  2.    Hastelloys
  3.    Nimonics
  4.    Babbit metal
 Discuss Question
Answer: Option D. -> Babbit metal
Question 246. Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
  1.    Oxygen
  2.    Arsenic
  3.    Antimony
  4.    Bismuth
 Discuss Question
Answer: Option D. -> Bismuth
Question 247. Babbit metal (used for making bearings) comprises of
  1.    Mainly tin (85%) and lead
  2.    Saw dust and iron dust mixture
  3.    Zinc and aluminium
  4.    Copper and aluminium
 Discuss Question
Answer: Option A. -> Mainly tin (85%) and lead
Question 248. Coke oven walls are lined with __________ bricks.
  1.    Silica
  2.    Tar-dolomite
  3.    Low thermal conductivity
  4.    Fire clay
 Discuss Question
Answer: Option A. -> Silica
Question 249. Maximum consumption of lead is in the manufacture of
  1.    Storage batteries
  2.    Solder alloys
  3.    Electric cable sheathing
  4.    Lead lined vessels
 Discuss Question
Answer: Option A. -> Storage batteries
Question 250. The chlorinator used in the manufacture of DDT is made of
  1.    Glass
  2.    Glass lined steel
  3.    Teflon
  4.    Bakelite
 Discuss Question
Answer: Option B. -> Glass lined steel

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