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Environmental engineering
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q61 ⇒ Laying of sewers is usually done with the help of sight rails and boning rods [other wrong options] [Discuss in forum] a theodolite a compass a plane table |
Q62 ⇒ Corrosion in concrete sewers is caused by septic conditions [other wrong options] [Discuss in forum] dissolved oxygen chlorine nitrogen |
Q63 ⇒ If the sewage contains grease and fatty oils, these are removed in skimming tanks [other wrong options] [Discuss in forum] grit chambers detritus tanks sedimentation tanks |
Q64 ⇒ Generally the detention period for grit chambers is kept as 1 minute [other wrong options] [Discuss in forum] 5 minutes 2-4 hours 12 hours |
Q65 ⇒ Which of the following unit works in anaerobic conditions? sludge digestion tank [other wrong options] [Discuss in forum] sedimentation tank activated sludge treatment trickling filters |
Q66 ⇒ The maximum efficiency of BOD removal is achieved in oxidation ditch [other wrong options] [Discuss in forum] oxidation pond aerated lagoons trickling filters |
Q67 ⇒ The working conditions in imhoff tanks are anaerobic in lower compartment and aerobic in upper compartment [other wrong options] [Discuss in forum] aerobic only anaerobic only aerobic in lower compartment and anaerobic in upper compartment |
Q68 ⇒ In facultative stabilization pond, the sewage is treated by dual action of aerobic bacteria and anaerobic bacteria [other wrong options] [Discuss in forum] aerobic bacteria only algae only sedimentation |
Q69 ⇒ The detention period for oxidation ponds is usually kept as 10 to 15 days [other wrong options] [Discuss in forum] 4-8 hours 24 hours 3 months |
Q70 ⇒ Composting and lagooning are the methods of sludge disposal [other wrong options] [Discuss in forum] sludge digestion sedimentation filtration |
Q71 ⇒ The underground conduit constructed for
removal of liquid waste of a community is
known as Sewer [other wrong options] [Discuss in forum] Canals Tunnels Sewerage |
Q72 ⇒ The main disadvantage of oxidation pond is that large area is required for construction [other wrong options] [Discuss in forum] maintenance and operation cost are high BOD removal is very low none of the above |
Q73 ⇒ A fresh sewage becomes stale in 6-8 hours [other wrong options] [Discuss in forum] 1 hour 3 hours 24-36 hours |
Q74 ⇒ For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as 6.5 to 8.0 [other wrong options] [Discuss in forum] 4.5 to 6.0 8.5 to 10.0 10.5 to 12.0 |
Q75 ⇒ The ratio in between length of the sewer and
velocity of flow when running full is known as Time of flow [other wrong options] [Discuss in forum] Inlet time Time of concentration Time intensity |
Q76 ⇒ Sludge volume index is defined as the ratio of percentage of sludge by volume to percentage of suspended solids by weight [other wrong options] [Discuss in forum] percentage of sludge by volume to percentage of total solids by weight percentage of suspended solids by weight to percentage of sludge by volume percentage of total solids by weight to percentage of sludge by volume |
Q77 ⇒ A man hole is generally provided at each All the above [other wrong options] [Discuss in forum] Bend Junction and change of sevver Change of gradient |
Q78 ⇒ For normal sludge, the value of sludge index for Indian conditions is 150 to 350 [other wrong options] [Discuss in forum] 0 to 50 50 to 150 350 to 500 |
Q79 ⇒ During putrefaction process the gas given off
is All of these [other wrong options] [Discuss in forum] Carbon dioxide Methane Ammonia |
Q80 ⇒ When there is no recirculation of sewage, then recirculation factor is 1 [other wrong options] [Discuss in forum] 0 infinity none of the above |
Or |