waste water engineering MCQs – Page 6

Practise focused waste water engineering questions with marked answers for exam preparation and subject revision.

waste water engineering Mcqs

101. Pick up the correct statement from the following?
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A. All the above

B. Only very fresh sewage contains some dissolved oxygen

C. The solubility of oxygen in sewage is 95% that is in distilled water

D. In treated sewage, 4 ppm of D.O. is essential

102. During purification process of sewage the gas given off, is________________?
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A. Hydrogen

B. Ammonia

C. Carbon dioxide

D. All the above

103. In sewers designed with self cleansing velocity________________?
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A. The bottom is silted

B. The bottom is scoured

C. Both silting and scouring occur at the bottom

D. Neither silting nor scouring occurs at the bottom

A. 1 minute

B. 3 minutes

C. 5 minutes

D. 2 minutes

105. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________?
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A. Branch sewer

B. Sewer outfall

C. House sewer

D. Lateral sewer

106. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?
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A. None of these

B. 1 in 120

C. 1 in 60

D. 1 in 100

107. In a trickling filter_________________?
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A. Filtration process is used

B. Biological action is used

C. Neither A. nor B.

D. Both A. and B.

108. The gradient of sewers depends upon_________________?
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A. All the above

B. Discharge

C. Velocity of flow

D. Diameter of the sewer

109. In a fully mechanised composting plant, involves________________?
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A. Mechanized receipt

B. All of these

C. Mechanized segregation

D. Mechanized pulverising of refuse

110. The clarigesters are_________________?
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A. Circular Imhoff double tanks with bottom hoppers

B. Circular septic tanks

C. Circular Imhoff double storey tanks without bottom hoppers

D. Rectangular septic tanks

111. If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?
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A. 1.425 D

B. 1.625 D

C. 1.250 D

D. 1.350 D

112. Pick up the correct statement from the following ?
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A. Medium sewers are cleaned by cane rodding

B. Small sewers are cleaned by flushing

C. All the above

D. Medium sewers may be cleaned by pills

113. Pick up the correct statement from the following?
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A. The period after which the entire area starts contributing to the runoff, is called the time of concentration

B. All the above

C. The maximum rate of storm runoff is called peak drainage discharge

D. Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares

114. Dried sewage after treatment is used as____________________?
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A. Chemical for lowering B.O.D.

B. Fertilizer

C. Base material for paints

D. Building material

115. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?
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A. 15C

B. 0C

C. 20C

D. 25C

116. Pick up the incorrect statement from the following ?
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A. Septic tanks are generally provided a detention period of 12 to 36 hours

B. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases

C. None of these

D. Septic tanks are horizontal continuous flow type of sedimentation tanks

117. Flocculated particles do not change their___________________?
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A. Weight

B. Size

C. None of these

D. Shape

118. The sewerage system originates from__________________?
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A. House sewers

B. Lateral sewers

C. Main sewers

D. Branch sewers

119. Pick up the correct statement from the following _________________?
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A. The screenings are disposed off either by burning or by burial or by dumping

B. All the above

C. The materials separated by screens, is called screenings

D. The process of burning the screenings, is known as compositing

120. The design period of sewage treatment works in normally_________________?
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A. 30 40 years

B. 5 10 years

C. 15 20 years

D. 40 50 years

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