ENVIRONMENTAL ENGINEERING QUIZ

If the average daily consumption of a city is 100,000 m³, the maximum daily consumption on peak hourly demand will be

180000 m³

100000 m³

270000 m³

150000 m³

TRUE ANSWER : ?
YOUR ANSWER : ?

The most commonly used sewer under culverts is

Circular cast iron sewer

Semi-elliptical sewer

Circular brick sewer

Horseshoe type sewer

TRUE ANSWER : ?
YOUR ANSWER : ?

The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

5 to 7

2 to 4

0.4 to 1.0

0.2 to 0.4

TRUE ANSWER : ?
YOUR ANSWER : ?

Most suitable section of sewer in separate sewage system is

Circular section

Rectangular section

Standard form of egg shaped sewer

Modified egg shaped section

TRUE ANSWER : ?
YOUR ANSWER : ?

The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water

Both (i) and (iii)

Both (i) and (ii)

Only (i)

Only (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

BOD > COD > TOD

TOD > BOD > COD

COD > BOD > TOD

TOD > COD > BOD

TRUE ANSWER : ?
YOUR ANSWER : ?

Chlorine demand of water is equal to

Sum of applied and residual chlorine

Residual chlorine

Difference of applied and residual chlorine

Applied chlorine

TRUE ANSWER : ?
YOUR ANSWER : ?

Residual chlorine in water is determined by

Starch iodide method

None of these

Both (A) and (B)

Orthotolidine method

TRUE ANSWER : ?
YOUR ANSWER : ?

Alum as a coagulant is found to be most effective when pH range of water is

6 to 8

8 to 10

2 to 4

4 to 6

TRUE ANSWER : ?
YOUR ANSWER : ?

The velocity of flow does not depend on

Hydraulic mean depth of sewer

Length of sewer

Grade of sewer

Roughness of sewer

TRUE ANSWER : ?
YOUR ANSWER : ?

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