ENVIRONMENTAL ENGINEERING IN CE QUIZ

Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

80

50

25

120

TRUE ANSWER : ?
YOUR ANSWER : ?

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Neither A nor B

With greater number of blades

Both A & B

Of increased diameter

TRUE ANSWER : ?
YOUR ANSWER : ?

The pH value of potable water should be between

13 to 14

6.5 to 8

1 to 1.5

4 to 5

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of nitrates in water in excess of 50 ppm causes

Mathenoglobenemia

Gastroentetitis

Tooth decay

Asphyxiation

TRUE ANSWER : ?
YOUR ANSWER : ?

Iron & manganese present as pollutant in water can not be removed by

Lime soda process or manganese zeolite process

Oxidation followed by settling & filtration

Chlorination

Ion exchange process

TRUE ANSWER : ?
YOUR ANSWER : ?

High noise level in a chemical plant can be controlled by the

Suppression of noise at the source itself

Path control of noise

All of these

Protection of operating personnel

TRUE ANSWER : ?
YOUR ANSWER : ?

Tri-sodium phosphate is used in boiler water treatment to reduce

Turbidity

Suspended silica

Dissolved oxygen

Caustic embrittlement

TRUE ANSWER : ?
YOUR ANSWER : ?

Main pollutant present in automobile exhaust is

NO

CO

CO₂

Hydrocarbons

TRUE ANSWER : ?
YOUR ANSWER : ?

Lagooning process is mainly a means of the

Sludge disposal

None of these

Biological treatment of wastes

Reduction of excessive flow in sewers

TRUE ANSWER : ?
YOUR ANSWER : ?

Higher concentration of CO₂ in atmosphere

All of these

Prevents solar heat being radiated out completely, resulting in

Reflects and absorbs the longer wavelength (infra-red) radiations

Allows visible solar radiation (ultraviolet) of short wave-length to pass through

TRUE ANSWER : ?
YOUR ANSWER : ?