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MCQs

Total Questions : 1977 | Page 27 of 198 pages
Question 261. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by
  1.    Dilute HCI
  2.    Acetic acid
  3.    Concentrated H₂SO₄
  4.    None of these
 Discuss Question
Answer: Option B. -> Acetic acid
Question 262. Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)₂. Lead pipes are readily corroded by
  1.    Dilute HC₁
  2.    Acetic acid
  3.    v
  4.    None of these
 Discuss Question
Answer: Option B. -> Acetic acid
Question 263. To improve the machinability of steel by its softening, it is subjected to
  1.    Cold working
  2.    Annealing
  3.    Shot blasting
  4.    Heating
 Discuss Question
Answer: Option B. -> Annealing
Question 264. 18/8 stainless steel means, that it contains
  1.    18% chromium and 8% nickel
  2.    18% chromium and 8% molybdenum
  3.    18% nickel and 8% chromium
  4.    18% molybdenum and 8% chromium
 Discuss Question
Answer: Option A. -> 18% chromium and 8% nickel
Question 265. Which of the following is the most widely used insulating material for steam carray-ing pipelines?
  1.    Ceramic fibre blanket
  2.    Glass wool and 85% magnesia
  3.    Vermiculite
  4.    Slag wool
 Discuss Question
Answer: Option B. -> Glass wool and 85% magnesia
Question 266. Lead alone is not used in storing equipment, because it
  1.    Is very costly
  2.    Corrodes easily
  3.    Is having low creep strength
  4.    None of these
 Discuss Question
Answer: Option C. -> Is having low creep strength
Question 267. Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
  1.    Nickel
  2.    Copper
  3.    Stainless steel
  4.    Brass
 Discuss Question
Answer: Option B. -> Copper
Question 268. High speed steel tools retain their hardness upto a temperature of __________ °C.
  1.    500
  2.    750
  3.    900
  4.    1100
 Discuss Question
Answer: Option C. -> 900
Question 269. Which of the following has the least carbon percentage?
  1.    Low carbon steel
  2.    Mild steel
  3.    Wrought iron
  4.    White cast iron
 Discuss Question
Answer: Option C. -> Wrought iron
Question 270. The material of construction of pressure mills used for squeezing out the juice from sugar cane is
  1.    Stainless steel
  2.    Cast iron
  3.    Mild steel
  4.    Monel
 Discuss Question
Answer: Option B. -> Cast iron

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