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MCQs

Total Questions : 918 | Page 7 of 92 pages
Question 61. Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the
  1.    Gravity settling chamber
  2.    Cyclone separator
  3.    Electrostatic precipitator
  4.    Bag filter
 Discuss Question
Answer: Option C. -> Electrostatic precipitator
Question 62. Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
  1.    Turbidity
  2.    Color (Hazen)
  3.    Total solids
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 63. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?
  1.    Idle running
  2.    Acceleration
  3.    Cruising
  4.    Deaccelaration
 Discuss Question
Answer: Option A. -> Idle running
Question 64. Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
  1.    Fire hazards
  2.    Explosion hazards
  3.    Persistent foam
  4.    Depletion of dissolved oxygen
 Discuss Question
Answer: Option C. -> Persistent foam
Question 65. A man exposed to excessive noise level in the working environment may suffer from
  1.    Hearing loss
  2.    Rupture of ear drum
  3.    Nervousness & fatigue
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 66. Water effluent generated in printing industry is decolourised by
  1.    Ion exchange technique
  2.    Reverse osmosis
  3.    Electrolytic decomposition
  4.    Adsorption
 Discuss Question
Answer: Option C. -> Electrolytic decomposition
Question 67. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
  1.    Mercury
  2.    Arsenic
  3.    Aluminium
  4.    Lead
 Discuss Question
Answer: Option C. -> Aluminium
Question 68. Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as
  1.    Photochemical smog
  2.    Peroxy acetyl nitrate (PAN) or methyl nitrile
  3.    Benzopyrene
  4.    Poly acrylonitrile
 Discuss Question
Answer: Option B. -> Peroxy acetyl nitrate (PAN) or methyl nitrile
Question 69. Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?
  1.    Active carbon
  2.    Silica gel
  3.    Bog iron (iron oxide)
  4.    Pulverised limestone
 Discuss Question
Answer: Option B. -> Silica gel
Question 70. 'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
  1.    Industrial chimney exhaust
  2.    Automobiles exhaust
  3.    Photochemical reaction in polluted atmosphere
  4.    Burning of domestic fuel
 Discuss Question
Answer: Option B. -> Automobiles exhaust

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