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MCQs

Total Questions : 100 | Page 9 of 10 pages
Question 81. What is the ratio of BOD/COD in untreated waste?
  1.    1-3
  2.    0.3-0.8
  3.    0.1-0.2
  4.    3-5
 Discuss Question
Answer: Option B. -> 0.3-0.8
Answer: (b).0.3-0.8
Question 82. What is the ratio of BOD/COD in the final effluent?
  1.    0 8-1.2
  2.    0.2-0.5
  3.    0.1-0.3
  4.    0.4-0.6
 Discuss Question
Answer: Option C. -> 0.1-0.3
Answer: (c).0.1-0.3
Question 83. Which of these is not a method to determine the number of colonies of bacteria present in a sample?
  1.    Multiple Tube fermentation
  2.    Pour and spread plate method
  3.    Membrane filter technique
  4.    Toxicity test
 Discuss Question
Answer: Option D. -> Toxicity test
Answer: (d).Toxicity test
Question 84. How is TSS calculated?
  1.    MPN
  2.    HPLC
  3.    Filtration
  4.    Mass spectrometer
 Discuss Question
Answer: Option C. -> Filtration
Answer: (c).Filtration
Question 85. Which of these is the used as the indicator when the titration is carried out to determine the amount of COD present in a sample.
  1.    Methyl Orange
  2.    Methyl blue
  3.    Ferroin
  4.    Phenolphthalein
 Discuss Question
Answer: Option C. -> Ferroin
Answer: (c).Ferroin
Question 86. Which valve is most commonly used in house hold applications?
  1.    Globe valve
  2.    Gate valve
  3.    Butterfly valve
  4.    Check valve
 Discuss Question
Answer: Option A. -> Globe valve
Answer: (a).Globe valve
Question 87. Which valve can be used in the service to handle fluids and gases and at the same time can be used for throttling as well?
  1.    Butterfly valve
  2.    Gate valve
  3.    Plug valve
  4.    Diaphragm valve
 Discuss Question
Answer: Option C. -> Plug valve
Answer: (c).Plug valve
Question 88. Though a needle valve is similar to a gate valve in design and operation it can be used as a throttling valve.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 89. Which type of valve is preferred for vacuum applications?
  1.    Diaphragm valve
  2.    Butterfly valve
  3.    Globe valve
  4.    Sluice valve
 Discuss Question
Answer: Option A. -> Diaphragm valve
Answer: (a).Diaphragm valve
Question 90. Which of these are usually not preferred for frequent operation?
  1.    Ball valve
  2.    Plug valve
  3.    Gate valve
  4.    Butterfly valve
 Discuss Question
Answer: Option C. -> Gate valve
Answer: (c).Gate valve

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