Sathyabama University 2008 B.Tech Chemical Engineering Mechanical Operations - Question Paper
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act, 1956)
Course & Branch: B. Tech Chemical (Part Time)
Title of the paper: Mechanical Operations
Semester: II Max. Marks: 80
Sub.Code: 619PT203 (2007/2007 JAN) Time: 3 Hours
Date: 19-05-2008 Session: FN
PART A (10 x 2 = 20)
Answer All the Questions
1. What is meant by cumulative analysis?
2. What is meant by Electrostatic Precipitation?
3. State Kicks Law.
4. Define Crushing Efficiency.
5. Classify various types of settling.
6. Define terminal velocity.
7. Define Specific cake resistance.
8. Write short notes on filter aids.
9. Define blending and mixing.
10. Define flow number.
PART B (5 x 12 = 60)
Answer All the Questions
11. Explain the calculation involved in finding the efficiency of screen.
(or)
12. One tonne per hour of dolomite is produced by a ball mill operating in closed circuit with a 100 mesh screen. The screen analysis (weight %) is given below. Calculate the screen efficiency.
|
Mesh |
Feed |
Oversize |
Undersize |
|
35 |
7.07 |
13.67 |
0 |
|
48 |
16.60 |
32.09 |
0 |
|
65 |
14.02 |
27.12 |
0 |
|
100 |
11.82 |
20.70 |
2.32 |
|
150 |
9.07 |
4.35 |
14.32 |
|
200 |
7.62 |
2.07 |
13.34 |
|
-200 |
33.80 |
0 |
70.02 |
|
|
100 |
100 |
100 |
13. What are the various types of crushers give some type of crushers and explain any one of them?
(or)
14. A material is crushed in a jaw crusher and the average size of the particle is reduced from 5cm to 1.3cm with consumption of energy at the rate of 37 Watt.hr/ton. What will be the consumption of energy necessary to crush the same material of average size 8 cm to an average size 3 cm. The mechanical efficiency remains same. (a) Using Rittingers law; (b) using Kicks law.
15. With neat diagram explain the working and operation of a cyclone separator.
(or)
16. A slurry containing 5 kg water per kg of solids is to be thickened to a sludge containing 1.5kg of water per kag of solids in a continuous operation. Laboratory tests using five different concentrations of the slurry yielded the following results:
|
Concentration kg water/kg solids |
5.0 |
4.2 |
3.7 |
3.1 |
2.5 |
|
Rate of sedimentation mm/sec |
0.20 |
0.12 |
0.094 |
0.074 |
0.05 |
Calculate the minimum area of a thickener to effect the separation of 1.33kg of solids per second.
17. Explain the principal and working of rotary continuous filter with a neat diagram.
(or)
18. Write short notes on liquid clarification, gas cleaning, cross flow filtration and sand filter.
19. Derive the power calculation equation for Agitated vessel.
(or)
20. Explain in detail about the flow pattern in agitated vessel.
| Earning: Approval pending. |
