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MCQs

Total Questions : 2215 | Page 9 of 222 pages
Question 81. Which of the following is the softest material?
  1.    Talc
  2.    Feldspar
  3.    Corundum
  4.    Calcite
 Discuss Question
Answer: Option A. -> Talc
Question 82. The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
  1.    20
  2.    12
  3.    8
  4.    2
 Discuss Question
Answer: Option D. -> 2
Question 83. Work index is defined as the
  1.    Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
  2.    Energy needed to crush one tonne of feed to 200 microns
  3.    Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
  4.    Energy needed to crush one ton of feed to 100 microns
 Discuss Question
Answer: Option A. -> Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
Question 84. Which of the following is the hardest material?
  1.    Calcite
  2.    Quartz
  3.    Corundum
  4.    Gypsum
 Discuss Question
Answer: Option C. -> Corundum
Question 85. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
  1.    Flight
  2.    Slat or drag
  3.    Ribbon
  4.    Screw
 Discuss Question
Answer: Option D. -> Screw
Question 86. Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
  1.    Drag
  2.    Ribbon
  3.    Screw
  4.    Slat
 Discuss Question
Answer: Option B. -> Ribbon
Question 87. Sulphuric acid mist is arrested by using a __________ scrubber.
  1.    Packed wet
  2.    Hollow wet
  3.    Venturi
  4.    Co-current
 Discuss Question
Answer: Option C. -> Venturi
Question 88. __________ conveyors are also called scrapers.
  1.    Apron
  2.    Screw
  3.    Helical flight
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C
Question 89. Coal is finally pulverised to 200 mesh size for burning in boilers by a
  1.    Hammer crusher
  2.    Ball mill
  3.    Roll crusher
  4.    Gyratory crusher
 Discuss Question
Answer: Option B. -> Ball mill
Question 90. Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)
  1.    S
  2.    1/R
  3.    1/μ
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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