1) The first stage of neutral process of sludge digestion, is__________________? a. Acid fermentation b. Acid regressio c. Alkaline fermentation d. None of these
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2) The formula V = (1/n) r2/3____________________? a. Chezy’s formula b. Bazin’s formula c. Kutter’s formula d. Manning’s formula
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3) The maximum diameter of sewers adopted in the designs is_______________? a. 1.0 m b. 2.0 m c. 3.0 m d. 4.0 m
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4) Facultative bacteria survive in_____________________? a. The presence of oxygen b. The absence of oxygen c. Both cases A. and B. d. Neither A. nor B.
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5) The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________? a. 20 m b. 30 m c. 45 m d. 75 m
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6) The underground sewers are more subjected to________________? a. Tensile force b. Compressive force c. Bending force d. Shearing force
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7) Ventilating shafts are provided to a sewer line at every__________________? a. 100 m b. 150 m c. 200 m d. 300 m
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8) Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________? a. pt = 3H3p/2 Z5 b. pt = 2H3p/3 Z5 c. pt = 3H3p/2Z5 d. pt = 2 3p/3Z5
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9) For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________? a. 1.5 b. 2.0 c. 2.5 d. 3.0
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10) If the pH value of sewage is 7__________________? a. It is acidic b. It is alkaline c. It is neutral d. None of these
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11) The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________? a. 25,000 to 35,000 litres/sqm/day b. 40,000 to 50,000 litres/sqm/day c. 50,000 to 60,000 litres/sqm/day d. 80,000 to 10,000 litres/sqm/day
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12) The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________? a. 5 m b. 5.5 m c. 6.5 m d. 7 m
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13) For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________? a. Cast iron sewers b. Cement concrete sewers c. Glazed bricks sewers d. Stone ware sewers
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14) The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________? a. 1.5 b. 2.0 c. 3.0 d. 4.0
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15) Large diameter sewers subjected to external pressure alone, are reinforced ______________________? a. Near the inner surface of the pipe b. Near the outer surface of the pipe c. Both A. and B. d. With elliptical cage
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16) The liquid wastes from kitchens, bath rooms and wash basins, is not called________________? a. Liquid waste b. Sullage c. Sewage d. None of these
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17) The detention time (t) of a settling tank, may be defined as the time required for_________________? a. A particle to travel along its length b. A particle to travel from top surface to bottom sludge zone c. The flow of sewage to fill the tank d. None of these
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18) The effluent of a septic tank is_________________? a. Fit for discharge into any open drain b. Foul and contains dissolved and suspended solids c. As good as that from a complete treatment d. None of these
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19) The design period of sewage treatment works in normally_________________? a. 5 – 10 years b. 15 – 20 years c. 30 – 40 years d. 40 – 50 years
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20) In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________? a. D b. D /2 c. D/3 d. D/4
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