Dashboard ► My courses ► 2302-CVL100 ► 25 April - 1 May ► Quiz 2
Started on Wednesday, 1 May 2024, 10:30 AM
State Finished
Completed on Wednesday, 1 May 2024, 10:50 AM
Time taken 19 mins 10 secs
Grade 4.00 out of 15.00 (27%)
Question 1 The past population of a city in three consecutive decades, i.e., in year 2001,
Complete 2011 and 2021 was 90,000; 2,60,000 and 4,90,000, respectively. Using
Mark 2.50 out of logistic curve method determine the saturation population 692595.745
5.00
and the expected population in 2031 .
Question 2 The mechanism of particle collection in baghouse filter is
Complete
Select one:
Mark 0.00 out of
1.00
a. Newton’s drag force
b. Stoke’s settling
c. Sieving
d. Van der waals force
The correct answer is: Sieving
Question 3 A cyclone and a gravity settler are compared for collection of particles 3
Complete emitted from a steel manufacturing plant. The flue gas flow rate was 5 m /s.
Mark 0.00 out of The particles are of aerodynamic diameter 10 μm.
3
3.00 The density of the particle was 4000 kg/m . The angular velocity of particle
was 22 radians/sec. The width of the inlet of cyclone was 1.1 m.
-5 -2
Given, µ=1.85×10 kg/m.s, Cc=1, g=9.81 ms .
Calculated the ratio of centrifugal force to gravitational force. {Round off to
near integer}
One possible correct answer is: 109
Calculate the number of turns required to achieve 99% collection efficiency in
cyclone assuming mixed flow. {Round off answer to nearest integer}
134
One possible correct answer is: 14
What would be the width of gravity settler to achieve the same efficiency, if
the height of the settler's entrance is same as the width of cyclone entrance.
{Round off answer to nearest integer}
One possible correct answer is: 16
Question 4 Match the following parameters of sewage with the most appropriate values:
Complete
Mark 0.50 out of Phosphate 100 to 400 mg/L
2.00
Total Kjeldahl nitrogen 20 to 50 mg/L
COD 5 to 10 mg/L
BOD 200 to 700 mg/L
The correct answer is: Phosphate → 5 to 10 mg/L, Total Kjeldahl nitrogen → 20 to
50 mg/L, COD → 200 to 700 mg/L, BOD → 100 to 400 mg/L
Question 5 The plume rise was calculated as 7 m for a stack 150 m high. The wind
Not answered velocity at the tip of the stack was 2 m/s. The emission rate was 13 kg/s.
{Given, σy=143; σz=47} Determine the following using formula given below.
Marked out of 2.00
Take absolute value in case of logarithmic values is negative.
At what perpendicular distance from the center line the 24-h average
-3
concentration will meet the WHO norms for PM2.5 (i.e. 15 μgm ). {Round off
answer to the nearest integer}
One possible correct answer is: 421.79300593779
What should be the stack height if -3
the center line ground level concentration
needs to be maintained at 40 μgm . {Round off answer to the nearest
integer}
One possible correct answer is: 132
Question 6 The Vertical dispersion coefficient depends on the following variables and
Complete parameters for a given stability class.
Mark 1.00 out of
Select one:
1.00
a. c, x, d and f
b. d, x, and c
c. a, x, and d
d. x, a
The correct answer is: c, x, d and f
Question 7 Determine the temperature and height of the mixing layer at 11:00 am in the
Complete month of June if the cumulative atmospheric heating is 700 K-m and
temperature lapse rate was observed as 6 °C/km. The surface temperature
Mark 0.00 out of
at 6:00 am was 12 °C. The boundary layer is found at 1.8 km from earth
1.00
surface. {Round off to integer}
Mixing layer height (m)
15
One possible correct answer is: 71
Temperature of mixing layer (°C)
One possible correct answer is: 32
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