Environmental Engineering

A. higher temperature
B. sunlight
C. satisfying oxygen demand
D. none of the above

A. specific gravity of solid particles
B. size of particles
C. depth of tank
D. temperature of liquid

A. TOD>BOD>COD
B. TOD>COD>BOD
C. BOD>COD>TOD
D. COD>BOD>TOD

A. 1/3
B. 2/3
C. 3/4
D. 1.0

A. 1 ppm
B. 4 ppm
C. 10 ppm
D. 40 ppm

A. maximum at noon
B. minimum at noon
C. maximum at midnight
D. same throughout the day

A. inlet
B. manhole
C. drop manhole
D. catch basin

A. maximum flow only
B. minimum flow only
C. average flow only
D. maximum and minimum flow

A. septic conditions
B. dissolved oxygen
C. chlorine
D. nitrogen

1) settling tank
2) digestion tank
3) aeration tank
The correct answer is?

A. only (1)
B. (1) and (2)
C. (1) and (3)
D. only (3)