Environmental Engineering MCQs

A. separate system

B. combined system

C. partially separate system

D. partially combined system

A. suspended impurities

B. dissolved impurities

C. both suspended and dissolved impuri¬ties

D. none of the above

A. 4.5 to 6.0

B. 6.5 to 8.0

C. 8.5 to 10.0

D. 10.5 to 12.0

A. reflux valve

B. sluice valve

C. air relief valve

D. pressure relief valve

A. less than 1.0 m/sec

B. 1.0 m/sec to 1.2 m/sec

C. 1.5 m/sec to 2.0 m/sec

D. 3.0 m/sec to 3.5 m/sec

A. septic conditions

B. dissolved oxygen

C. chlorine

D. nitrogen

A. 1 ppm

B. 4 ppm

C. 10 ppm

D. 40 ppm

A. N = y + R

B. y = N + R

C. R = N + y

D. R > (N + y)

A. 15 cm and 100 cm

B. 15 cm and 300 cm

C. 30 cm and 450 cm

D. 60 cm and 300cm

A. reduced at higher pH value of water

B. unaffected by pH value of water

C. increased at higher pH value of water

D. highest at pH value equal to 7