# PARTICLE TECHNOLOGY

## Gas cleaning - Chapter 14

### Answers to problems at the end of Chapter 14:

Q1
Top row of table is missing: 29.7; 0 and 0
Middle row of table is: 300.3; 125.9 and 42
Very bottom row is: 19.8; 19.8 and 100
i.e. all the material less than 53 microns (19.8 kg) goes in to the fine cut of the classifier - hence the grade efficiency is 100%. Using the definition of grade efficiency as fraction by mass that enters the fine cut of the classifier.

Q2
i) the correct answer is (b).
ii) the correct answer is (a).
iii) the correct answer is (c).
iv) the correct answer is (c).
v) the correct answer is (a).
vi) the correct answer is (d).
vii) the correct answer is (b).
viii) the correct answer is (c).

Q3
i) the correct answer is (b).
ii) the correct answer is (d).
v) the correct answer is (b).
vi) the correct answer is (a).
vii) the correct answer is (c).
viii) the correct answer is (c).

Q4
i) see below.
ii) the correct answer is (c).
iii) the correct answer is (a).
iv) the correct answer is (c).
v) the correct answer is (b).
vi) see below.
vii) see below.
ix) the correct answer is (b).

Q5
i) the correct answer is (a).
ii) the correct answer is (c).
iii) the correct answer is (c).
iv) the correct answer is (c).
See Figure 14.9.

Q6