ENVIRONMENTAL ENGINEERING QUIZ

Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

R > (N + y)

N = y + R

R = N + y

y = N + R

TRUE ANSWER : ?
YOUR ANSWER : ?

When there is no recirculation of sewage, then recirculation factor is

None of these

1

Infinity

TRUE ANSWER : ?
YOUR ANSWER : ?

The biochemical treatment of sewage effluents is essentially a process of

Oxidation

Dehydration

Alkalinization

Reduction

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following chemical compounds can be used for de-chlorination of water?

Bleaching powder

Sulphur dioxide

Carbon dioxide

Chloramines

TRUE ANSWER : ?
YOUR ANSWER : ?

The distribution mains are designed for

Maximum hourly demand

Maximum daily demand

Maximum hourly demand on maximum day

Average daily demand

TRUE ANSWER : ?
YOUR ANSWER : ?

Residual chlorine in water is determined by

Starch iodide method

Orthotolidine method

Both (A) and (B)

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Sludge volume index is defined as the ratio of

Percentage of suspended solids by weight to percentage of sludge by volume

Percentage of sludge by volume to percentage of suspended solids by weight

Percentage of sludge by volume to percentage of total solids by weight

Percentage of total solids by weight to percentage of sludge by volume

TRUE ANSWER : ?
YOUR ANSWER : ?

As compared to cast iron pipes, steel pipes are

Less susceptible to corrosion

Heavier

Stronger

Costlier

TRUE ANSWER : ?
YOUR ANSWER : ?

For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

6.5 to 8.0

10.5 to 12.0

4.5 to 6.0

8.5 to 10.0

TRUE ANSWER : ?
YOUR ANSWER : ?

Activated carbon is used for

Removing corrosiveness

Removing odours

Disinfection

Removing hardness

TRUE ANSWER : ?
YOUR ANSWER : ?