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Environmental Engineering
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Question
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Options
A. hydrocarbons
B. hydrogen flouride
C. hydrogen sulphides
D. nitrogen dioxide
Correct Answer
hydrogen flouride
More questions
1. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
Options
A. 105
B. 135
C. 160
D. 185
Show Answer
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Discuss
Correct Answer: 135
2. Overall efficiency of the distillation column is
Options
A. the ratio of number of ideal plates to actual plates.
B. the ratio of number of actual plates to ideal plates.
C. same as the Murphree efficiency.
D. always more than the point efficiency.
Show Answer
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Discuss
Correct Answer: the ratio of number of ideal plates to actual plates.
3. Bucket elevators are not suitable for the vertical lifting of __________ materials.
Options
A. fine (e.g. - 200 mesh size coal)
B. sticky (e.g. clay paste)
C. small lumpy (e.g. grains and sand)
D. free flowing
Show Answer
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Discuss
Correct Answer: sticky (e.g. clay paste)
4. Water separometer index (modified) (WSIM) of a petrofuel is the measure of its
Options
A. emulsification tendency.
B. water separation characteristics.
C. water content.
D. water absorbing capacity from atmosphere.
Show Answer
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Discuss
Correct Answer: water separation characteristics.
5. The most suitable solvent for deasphalting vacuum residue is
Options
A. propane
B. methyl ethyl ketone
C. doctor's solution
D. methanol amine
Show Answer
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Discuss
Correct Answer: methyl ethyl ketone
6. A proportional controller with a gain of
K
c
is used to control a first order process. The offset will increase, if
Options
A.
K
c
is reduced.
B.
K
c
is increased.
C. integral control action is introduced.
D. derivative control action is introduced.
Show Answer
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Discuss
Correct Answer:
K
c
is increased.
7. A tube mill as compared to a ball mill
Options
A. employs smaller balls.
B. gives finer size reduction but consumes more power.
C. has larger length/diameter ratio (>2 as compared to 1 for ball mill).
D. all (a), (b) and (c).
Show Answer
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Correct Answer: all (a), (b) and (c).
8. Pick out the wrong statement.
Options
A. Pensky-Marten apparatus is used for determining flash points above 50°C.
B. Characterisation factor of paraffinic crude oil is more than 12.
C. Abel apparatus is used for determining flash points below 50°C.
D. An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index.
Show Answer
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Correct Answer: An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index.
9. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
Options
A. 35
B. 75
C. 95
D. 105
Show Answer
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Discuss
Correct Answer: 75
10. Vulcanisation of rubber does not increase its
Options
A. elasticity
B. plasticity
C. ductility
D. none of these
Show Answer
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Discuss
Correct Answer: plasticity
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