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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. |
Q21 ⇒ Sewage that has received no purification treatment is called Crude sewage [other wrong options] [Discuss in forum] Raw sewage Untreated sewage Fresh sewage |
Q22 ⇒ The slope of sewer shall be given in the direction of natural slope of ground [other wrong options] [Discuss in forum] given in the direction opposite to natural slope of ground zero steeper than 1 in 20 |
Q23 ⇒ A street sewer into which sewer from house
connections in poured is called Lateral sewer [other wrong options] [Discuss in forum] Street sewer Main sewer Head sewer |
Q24 ⇒ The design discharge for the separate sewer system shall be taken as 6xDWF [other wrong options] [Discuss in forum] equal to dry weather flow (DWF) 2xDWF 3 x DWF |
Q25 ⇒ Man hole covers are usually made of Cast iron [other wrong options] [Discuss in forum] Cement Wood Steel |
Q26 ⇒ The design discharge for the combined sewer system shall be taken as rainfall + 2 DWF [other wrong options] [Discuss in forum] equal to rainfall rainfall + DWF rainfall + 6 DWF |
Q27 ⇒ Direct destruction to pathogenic bacteria is
caused by Chlorination [other wrong options] [Discuss in forum] Direct exposure to sunlight Oxidation Filtration |
Q28 ⇒ The minimum and maximum diameters of sewers shall preferably be 15 cm and 300 cm [other wrong options] [Discuss in forum] 15 cm and 100 cm 30 cm and 450 cm 60 cm and 300cm |
Q29 ⇒ The depletion of dissolved oxygen due to B .0.D. reaction of sewage is called Deoxygenation [other wrong options] [Discuss in forum] Reaeration Aeration Oxidation |
Q30 ⇒ The main disadvantage of cement concrete sewers is difficulty in transportation due to heavy weight [other wrong options] [Discuss in forum] less strength difficulty in construction less life |
Q31 ⇒ A test used to measure the strength of waste
water is called BOD [other wrong options] [Discuss in forum] Detention period pH Surface setting rate |
Q32 ⇒ Most suitable section of sewer in separate sewage system is circular section [other wrong options] [Discuss in forum] rectangular section standard form of egg shaped sewer modified egg shaped section |
Q33 ⇒ The coagulant widely used for sewage
treatment is Ferric chloride [other wrong options] [Discuss in forum] Lime Alum Ferric sulphate |
Q34 ⇒ An egg shaped section of sewer provides self cleansing velocity at low discharges [other wrong options] [Discuss in forum] is economical than circular section is more stable than circular section is easy to construct |
Q35 ⇒ Normally the capacity of flushing cisterns for
water closets is 10 to 15 litre [other wrong options] [Discuss in forum] 1 to 2 litre 2 to 5 litre 25 to 40 litre |
Q36 ⇒ The velocity of flow does not depend on length of sewer [other wrong options] [Discuss in forum] grade of sewer hydraulic mean depth of sewer roughness of sewer |
Q37 ⇒ The capacity of flushing cisterns for urinals is
generally 5 litre [other wrong options] [Discuss in forum] 1 litre 15 litre 40 litre |
Q38 ⇒ The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is greater than HMD when flowing full [other wrong options] [Discuss in forum] equal to HMD when flowing full less than HMD when flowing full none of the above |
Q39 ⇒ Which of the following material is often used
for radiation shieldings ? Wood [other wrong options] [Discuss in forum] Wet cloth Lead Hydrogen |
Q40 ⇒ The effect of increasing diameter of sewer on the self cleansing velocity is to increase it [other wrong options] [Discuss in forum] to decrease it fluctuating nil |
Or |