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Environmental Engineering in Chemical Engineering MCQs

Chemical Engineering Objective Questions

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302. Pick out the wrong statement.
A. Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water
B. Cooling and freezing of water kills the bacteria present in it
C. With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing
D. Dissolved oxygen content in high pressure boiler feed water should be nil
Discussion
303. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
A. 20
B. 60
C. 90
D. 120
Discussion
304. Presence of __________ hardness is responsible for the temporary hardness in water.
A. Carbonate
B. Calcium
C. Choride
D. Sulphate
Discussion
305. Noise level inside a jet air liner in normal flight is about __________ decibels.
A. 80
B. 100
C. 125
D. 145
Discussion
306. Noise level during normal conversation among men is about __________ decibles.
A. 10
B. 45
C. 90
D. 115
Discussion
307. A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the
A. Global warming
B. Green house
C. Atmospheric effect
D. Ionosphere
Discussion

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