Code No: R05310802 R05 Set No. 2
III
B.Tech I Semester Supplementary Examinations,June 2010
MECHANICAL UNIT OPERATIONS
Chemical Engineering
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Data
for the
laboratory filtration of CaCO3 slurry
in water at 298 K (25 0C) are reported as follows at
a Constant Pressure (-∆P) of 338 kN/m2. The filter
area of the plate and
frame press was A=0.0439 m2 and
the slurry
concentration was Cs=23.47
kg/m3 . Calculate
the
constants α and Rm from the experimental data given, where t is
time in Sec and V is filtrate volume collected
in m3? [16]
|
t, sec
|
4.4
|
9.5
|
16.3
|
24.6
|
34.7
|
46.1
|
59.0
|
73.6
|
89.4
|
107.3
|
|
V× 103 m3
|
0.48
|
1.00
|
1.501
|
2.0
|
2.498
|
3.002
|
3.506
|
4.00
|
4.502
|
5.009
|
2. Discuss briefly about
following size reduction equipments.
(a) crushers
(b) grinders
[16]
3. (a) Write degrees
of Suspension in the order of increasing uniformity of suspension and
increasing power input
in case of suspension of solid particles.
(b) Write briefly about Scale up of Agitation equipment.
[8+8]
4. Discuss with a neat figure, the operation
of a Floatation Column. [16]
5. Define the terms:
particle
shape, specific surface of mixture, average
particle size, arithmetic mean diameter, mass
mean diameter, volume mean diameter. [16]
6. (a) Discuss what happens when
near-mesh particles are fed to screen.
(b) Mention the requirements
for effective filtration. [8+8]
7. An inclined
apron conveyor is used to carry crushed
dolomite to a discharge point at a horizontal
distance
and a vertical
height of 20 m and 4.0 m respectively from the tail end.
Find the width of the apron if the capacity of the conveyor is 85,000 kg/hr at a conveying speed of 0.2 m/s.
the height
of the side
walls is one-fourth of the apron width.
The bulk density of the material is 1350 kg/m3 and its angle of response (static) is 350. Take the inclination factor CB to be 0.95. The tractive
element for the conveyor is in the form of two laminated wheel
chains, with wheels running on plain (sliding)
bearings. The wheel diameter is 0.05m and that of wheel
shaft is 0.02m. Assume the operating conditions of the conveyor are moderate
and take the flange friction
factor to be 1.2. Determine the maximum chain tension if the
minimum tension is to be 1.5 kN. If three standard hauling wheel chains with rated pressure (breaking) strengths of 56, 80 and 112 kN are available,
determine which one will suit best to the purpose.
[16]
1
Code No: R05310802 R05 Set No. 2
8. A mixture of Silica (B) and
Galena
(A)
solid particles having a size
range of
5.21×10−6 m to 2.50×10−5 m is to
be separated
by hydraulic
classification
us- ing free settling
conditions in water at 293.2 K. The Specific gravity of silica is 2.65 and
that of galena is 7.5. Calculate the size range of the
various fractions obtained in the settling.
If the settling
is in the laminar region, the drag coefficients will be reasonably close to that for spheres.
Data:
Density of water at 293.2 K = 998 kg/m3
Viscosity of water at 293.2 K =1.005×10−3 Pa-s (kg/m.s). [16]
? ? ? ? ?
2
Code No: R05310802 R05 Set No. 4
III
B.Tech I Semester Supplementary Examinations,June 2010
MECHANICAL UNIT OPERATIONS
Chemical Engineering
Time: 3 hours
Max Marks:
80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Discuss what happens when
near-mesh particles are fed to screen.
(b) Mention the requirements
for effective filtration. [8+8]
2. An inclined apron conveyor is used to carry crushed
dolomite to a discharge point at a horizontal
distance
and a vertical height of 20 m and 4.0 m respectively from the tail end. Find
the width of the apron if the capacity of the conveyor is 85,000 kg/hr at a conveying speed of 0.2 m/s.
the height
of the side
walls is one-fourth of the apron width.
The bulk density of the material is 1350 kg/m3 and its angle of response (static) is 350. Take the inclination factor CB to be 0.95. The tractive
element for the conveyor is in the form of two laminated wheel
chains, with wheels running on plain (sliding)
bearings. The wheel diameter is 0.05m and that of wheel
shaft is 0.02m. Assume the operating conditions of the conveyor are moderate
and take the flange friction
factor to be 1.2. Determine the maximum chain tension if the
minimum tension is to be 1.5 kN. If three standard hauling wheel chains with rated pressure (breaking) strengths of 56, 80 and 112 kN are available,
determine which one will suit best to the purpose.
[16]
3. Discuss with a neat figure, the operation
of a Floatation Column. [16]
4. Discuss
briefly about following
size reduction equipments. (a) crushers
(b) grinders
[16]
5. A mixture of Silica (B) and
Galena
(A)
solid particles having a size
range of
5.21×10−6 m to 2.50×10−5 m is to
be separated
by hydraulic
classification
us- ing free settling
conditions in water at 293.2 K. The Specific gravity of silica is 2.65 and
that of galena is 7.5. Calculate the size range of the
various fractions obtained in the settling.
If the settling
is in the laminar region, the drag coefficients will be reasonably close to that for spheres.
Data:
Density of water at 293.2 K = 998 kg/m3
Viscosity of water at 293.2 K =1.005×10−3 Pa-s (kg/m.s). [16]
6. (a) Write degrees
of Suspension in the order of increasing uniformity of suspension and
increasing power input
in case of suspension of solid particles.
(b) Write briefly about Scale up of Agitation equipment.
[8+8]
7. Define the terms: particle shape, specific surface of mixture, average
particle size, arithmetic mean diameter, mass
mean diameter, volume mean diameter. [16]
3
Code No: R05310802 R05 Set No. 4
8. Data
for the
laboratory filtration of CaCO3 slurry
in water at 298 K (25 0C) are reported as follows at
a Constant Pressure (-∆P) of 338 kN/m2. The filter
area of the plate and
frame press was A=0.0439 m2 and
the slurry concentration was Cs=23.47
kg/m3 . Calculate
the
constants α and Rm from the experimental data given, where t is
time in Sec and V is filtrate volume collected
in m3? [16]
|
t, sec
|
4.4
|
9.5
|
16.3
|
24.6
|
34.7
|
46.1
|
59.0
|
73.6
|
89.4
|
107.3
|
|
V× 103 m3
|
0.48
|
1.00
|
1.501
|
2.0
|
2.498
|
3.002
|
3.506
|
4.00
|
4.502
|
5.009
|
? ? ? ? ?
4
Code No: R05310802 R05 Set No. 1
III
B.Tech I Semester Supplementary Examinations,June 2010
MECHANICAL UNIT OPERATIONS
Chemical Engineering
Time: 3 hours
Max Marks:
80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Write degrees
of Suspension in the order of increasing uniformity of suspension and
increasing power input
in case of suspension of solid particles.
(b) Write briefly about Scale up of Agitation equipment.
[8+8]
2. Define the terms:
particle
shape, specific surface of mixture, average
particle size, arithmetic mean diameter, mass
mean diameter, volume mean diameter. [16]
3. Discuss
briefly about following
size reduction equipments. (a) crushers
(b) grinders
[16]
4. Discuss with a neat figure, the operation
of a Floatation Column. [16]
5. A mixture of Silica (B) and
Galena
(A)
solid particles having a size
range of
5.21×10−6 m to 2.50×10−5 m is to
be separated
by hydraulic
classification
us- ing free settling
conditions in water at 293.2 K. The Specific gravity of silica is 2.65 and
that of galena is 7.5. Calculate the size range of the
various fractions obtained in the settling.
If the settling
is in the laminar region, the drag coefficients will be reasonably close to that for spheres.
Data:
Density of water at 293.2 K = 998 kg/m3
Viscosity of water at 293.2 K =1.005×10−3 Pa-s (kg/m.s). [16]
6. (a) Discuss what happens when
near-mesh particles are fed to screen.
(b) Mention the requirements
for effective filtration. [8+8]
7. Data
for the
laboratory filtration of CaCO3 slurry
in water at 298 K (25 0C) are reported as follows at
a Constant Pressure (-∆P) of 338 kN/m2. The filter
area of the plate and
frame press was A=0.0439 m2 and
the slurry concentration was Cs=23.47
kg/m3 . Calculate
the
constants α and Rm from the experimental data given, where t is
time in Sec and V is filtrate volume collected
in m3? [16]
|
t, sec
|
4.4
|
9.5
|
16.3
|
24.6
|
34.7
|
46.1
|
59.0
|
73.6
|
89.4
|
107.3
|
|
V× 103 m3
|
0.48
|
1.00
|
1.501
|
2.0
|
2.498
|
3.002
|
3.506
|
4.00
|
4.502
|
5.009
|
8. An inclined
apron conveyor is used to carry crushed
dolomite to a discharge point at a horizontal
distance
and a vertical height of 20 m and 4.0 m respectively from the tail end. Find
the width of the apron if the capacity
of the conveyor is 85,000
kg/hr at a conveying
speed of 0.2 m/s.
the height
of the side
walls is one-fourth of the apron width.
The bulk density of the material is 1350 kg/m3 and its angle
5
Code No: R05310802 R05 Set No. 1
of response (static) is
350. Take the inclination factor CB to be 0.95. The tractive
element for the conveyor is in the form of two laminated wheel
chains, with wheels running on plain (sliding)
bearings. The wheel diameter is 0.05m and that of wheel
shaft is 0.02m. Assume the operating conditions of the conveyor are moderate
and take the flange friction
factor to be 1.2. Determine the maximum chain tension if the
minimum tension is to be 1.5 kN. If three standard hauling wheel chains with rated pressure (breaking) strengths
of 56, 80 and 112 kN are available,
determine which one will suit best to the purpose.
[16]
? ? ? ? ?
6
Code No: R05310802 R05 Set No. 3
III
B.Tech I Semester Supplementary Examinations,June 2010
MECHANICAL UNIT OPERATIONS
Chemical Engineering
Time: 3 hours
Max Marks:
80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Define the terms: particle shape, specific surface of mixture,
average
particle size,
arithmetic mean diameter, mass mean diameter,
volume mean diameter. [16]
2. Discuss with a neat figure, the operation
of a Floatation Column. [16]
3. Discuss
briefly about following
size reduction equipments. (a) crushers
(b) grinders
[16]
4. An inclined apron conveyor is used to carry crushed
dolomite to a discharge point at a horizontal
distance
and a vertical height of 20 m and 4.0 m respectively from the tail end. Find
the width of the apron if the capacity of the conveyor is 85,000 kg/hr at a conveying speed of 0.2 m/s.
the height
of the side
walls is one-fourth of the apron width.
The bulk density of the material is 1350 kg/m3 and its angle of response (static) is 350. Take the inclination factor CB to be 0.95. The tractive
element for the conveyor is in the form of two laminated wheel
chains, with wheels running on plain (sliding)
bearings. The wheel diameter is 0.05m and that of wheel
shaft is 0.02m. Assume the operating conditions of the conveyor are moderate
and take the flange friction
factor to be 1.2. Determine the maximum chain tension if the
minimum tension is to be 1.5 kN. If three standard hauling wheel chains with rated pressure (breaking) strengths of 56, 80 and 112 kN are available,
determine which one will suit best to the purpose.
[16]
5. A mixture of Silica (B) and
Galena
(A)
solid particles having a size
range of
5.21×10−6 m to 2.50×10−5 m is to
be separated
by hydraulic
classification
us- ing free settling
conditions in water at 293.2 K. The Specific gravity of silica is 2.65 and
that of galena is 7.5. Calculate the size range of the
various fractions obtained in the settling.
If the settling
is in the laminar region, the drag coefficients will be reasonably close to that for spheres.
Data:
Density of water at 293.2 K = 998 kg/m3
Viscosity of water at 293.2 K =1.005×10−3 Pa-s (kg/m.s). [16]
6. (a) Write degrees
of Suspension in the order of increasing uniformity of suspension
and increasing power input in case of suspension
of solid particles.
(b) Write briefly about Scale up of Agitation equipment. [8+8]
7. (a) Discuss what happens when
near-mesh particles are fed to screen.
(b) Mention the requirements
for effective filtration. [8+8]
7
Code No: R05310802 R05 Set
No. 3
8. Data
for the
laboratory filtration of CaCO3 slurry
in water at 298 K (25 0C) are reported as follows at
a Constant Pressure (-∆P) of 338 kN/m2. The filter
area of the plate and
frame press was A=0.0439 m2 and
the slurry concentration was Cs=23.47
kg/m3 . Calculate
the
constants α and Rm from the experimental data given, where t is
time in Sec and V is filtrate volume collected
in m3? [16]
|
t, sec
|
4.4
|
9.5
|
16.3
|
24.6
|
34.7
|
46.1
|
59.0
|
73.6
|
89.4
|
107.3
|
|
V× 103 m3
|
0.48
|
1.00
|
1.501
|
2.0
|
2.498
|
3.002
|
3.506
|
4.00
|
4.502
|
5.009
|
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