ENVIRONMENTAL ENGINEERING IN CE QUIZ

Which of the following pollutants, if present in atmosphere is detectable by its odour?

CO₂

SO₂

CO

NO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Scale formation in boiler is controlled by

Eliminating H₂S in feed water

Reduction in hardness, silica & alumina in feed water

Preheating of feed water

Keeping the pH value of feed water just below 7

TRUE ANSWER : ?
YOUR ANSWER : ?

Reingleman chart No. 2 corresponds to __________ percent black smoke.

40

80

10

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank

Only (iii)

(i) and (iii)

(i) and (ii)

Only (i)

TRUE ANSWER : ?
YOUR ANSWER : ?

Noise level in a quiet private business office is about __________ decibels.

50

25

70

85

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.

84

92

80

88

TRUE ANSWER : ?
YOUR ANSWER : ?

The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?

Alkyl benzene sulphonate (ABS)

Alkalis

Benzene hexachloride

Chlorine

TRUE ANSWER : ?
YOUR ANSWER : ?

Lagoons used for purification of polluted water

Use micro-organisms/bacteria in presence of dissolved oxygen

All of these

Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre

Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds

TRUE ANSWER : ?
YOUR ANSWER : ?

Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.

Catalytically convert SO₂ to SO₃ in

Increase the dew point of

Reduce SO₂ content in

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of __________ in water stream are deleterious to aquatic life.

Soluble and toxic organics

Heavy metals and cynides

Suspended solids

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?