Engineering Questions with Answers - Multiple Choice Questions

Environmental Engineering MCQ – Types of Plumes

1 - Question

Coning plume occurs under which conditions?
a) Super adiabatic
b) Sub adiabatic
c) Neutral
d) Inversion

View Answer

Answer: b
Explanation: Coning occurs under sub adiabatic conditions. The plume is of conical shaped.




2 - Question

In which of the following plumes, stable condition prevails?
a) Lofting
b) Fanning
c) Neutral
d) Fumigating

View Answer

Answer: b
Explanation: The stability prevails in the Fanning plume. It occurs during inversion conditions.




3 - Question

The upward vertical rise prevails in which of the following plume?
a) Trapping
b) Fanning
c) Looping
d) Neutral

View Answer

Answer: d
Explanation: In Neutral plume, the Environmental lapse rate is equal to the Adiabatic lapse rate.




4 - Question

Which of the following plume is worst for the dispersion of pollutants?
a) Trapping
b) Fanning
c) Neutral
d) Fumigating

View Answer

Answer: d
Explanation: In Fumigating plume, the pollutants come down near the ground due to turbulence instead of escaping above the stack. This makes it the most dangerous plume.




5 - Question

In which of the following plumes, unstable condition prevails?
a) Trapping
b) Fanning
c) Looping
d) Neutral

View Answer

Answer: c
Explanation: Rapid dispersion of pollutants takes place under Looping plume. It occurs under super adiabatic conditions.




6 - Question

Which of the following are contradictory plume?
a) Lofting and fumigating
b) Looping and coning
c) Neutral and lofting
d) Fumigating and trapping

View Answer

Answer: a
Explanation: In Lofting plume, the super adiabatic lapse rate occurs above the stack, whereas, in Fumigating plume, it occurs below the stack.




7 - Question

The maximum efficiency of the electrostatic precipitator is ___________
a) 95%
b) 80%
c) 99%
d) 100%

View Answer

Answer: c
Explanation: The efficiency of electrostatic precipitator lies between 95% to 99%. They are used in thermal power plants.




8 - Question

The minimum particle size removes by the gravitational chamber is ___________
a) >50μm
b) >10μm
c) >25μm
d) >0.5μm

View Answer

Answer: a
Explanation: The minimum particle size removes by the gravitational settling chamber is >50μm and its efficiency is less than 50%.

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