Environmental Engineering

A. 10 years
B. 25 years
C. 50 years
D. 75 years

A. separate system
B. combined system
C. partially separate system
D. partially combined system

A. 4 mm/hr
B. lOmm/hr
C. 20 mm/hr
D. 40 mm/hr

A. much greater than 1
B. slightly less than 1
C. equal to 1
D. slightly greater than 1

A. given in the direction of natural slope of ground
B. given in the direction opposite to natural slope of ground
C. zero
D. steeper than 1 in 20

A. equal to rainfall
B. rainfall + DWF
C. rainfall + 2 DWF
D. rainfall + 6 DWF

A. less strength
B. difficulty in construction
C. difficulty in transportation due to heavy weight
D. less life

A. is economical than circular section
B. provides self cleansing velocity at low discharges
C. is more stable than circular section
D. is easy to construct

A. circular brick sewer
B. circular cast iron sewer
C. semi-elliptical sewer
D. horse-shoe type sewer

A. acidic and alkaline
B. alkaline and acidic
C. both acidic
D. both alkaline