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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 1
46.
Most of the atmospheric air pollutants are present in large quantity in
stratosphere
thermosphere
trophosphere
mesosphere
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
Pick out the wrong statement.
Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water.
Cooling and freezing of water kills the bacteria present in it.
With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing.
Dissolved oxygen content in high pressure boiler feed water should be nil.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
coal
uranium ore
iron ore
lime
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the
bacterial stability factor.
relative stability.
biological oxygen demand (BOD).
oxygen ion concentration.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
Pick out the wrong statement.
The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone.
Mesosphere is characterised by very low atmospheric pressure and low temperature.
Troposhere is a dusty zone containing water vapor and clouds.
The radio waves used in the long distance radio communication are reflected back to earth by stratosphere.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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