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MCQs

Total Questions : 1977 | Page 8 of 198 pages
Question 71. The specific gravity of coal depends mainly on its __________ content.
  1.    Carbon
  2.    Volatile matter
  3.    Ash
  4.    Moisture
 Discuss Question
Answer: Option C. -> Ash
Question 72. In a plate type heat exchanger, heat transfer plates are never made of
  1.    Stainless steel
  2.    Cast iron
  3.    Titanium
  4.    Hastealloy C
 Discuss Question
Answer: Option B. -> Cast iron
Question 73. Platinum and silver are corroded by
  1.    Caustic soda solution
  2.    Phosphoric acid
  3.    Sulphuric acid (10%)
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 74. For storing water and acid free benzol, use a __________ vessel.
  1.    Steel
  2.    Karbate
  3.    Stainless steel
  4.    None of these
 Discuss Question
Answer: Option A. -> Steel
Question 75. A steel alloy containing 36% nickel is called __________ , which has a zero co- efficient of expansion.
  1.    Austenitic stainless steel
  2.    Heat resisting steel
  3.    Invar
  4.    High speed steel
 Discuss Question
Answer: Option C. -> Invar
Question 76. Hydrocyanic acid is not shipped in
  1.    Cast iron vessels
  2.    Steel cylinders
  3.    Aluminium containers
  4.    Monel drums
 Discuss Question
Answer: Option A. -> Cast iron vessels
Question 77. The carbonating tower used in Solvay process of soda ash manufacture is made of
  1.    Cast iron
  2.    Stainless steel
  3.    Karbate
  4.    Lead lined steel
 Discuss Question
Answer: Option A. -> Cast iron
Question 78. The material of construction of bearings is
  1.    Cast iron
  2.    Babbit metal
  3.    Pig iron
  4.    Steel
 Discuss Question
Answer: Option B. -> Babbit metal
Question 79. Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
  1.    Monel
  2.    Stainless steel
  3.    Graphite
  4.    Kel-F and teflon
 Discuss Question
Answer: Option B. -> Stainless steel
Question 80. Metal at the top of the electromotive series is
  1.    Least active
  2.    Most stable
  3.    Most active
  4.    Most noble
 Discuss Question
Answer: Option C. -> Most active

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