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 APPENDIX B
ANSWERS TO SELF-STUDY QUESTIONS
Ql-1.
(a)
Ql-9.
(d)
Q1-2.
(c)
Ql-10.
(a)
Q1-11.
(a)
Q1-3.
(b)
Ql-12.
(a)
Q1-4.
(a)
Q1-13.
(d)
Ql-5.
(b)
Q1-6.
(d)
Q1-14.
(a)
Q1-7.
(a)
Ql-15.
(c)
Ql-16.
(c)
Ql-8.
(d)
Static, velocity and total pressures.
Q2-1.
Average velocity = (300 * 4 + 450 * 4 + 600)/9 = 400 fpm
Q2-2.
Flow rate = 18 * 18 * 400/144 = 900 cfm
2
(b) Area = 18 * 20/144 = 2.5 ft
Q2-3.
(b) Flow rate = 2.5 ft2 * 400 fpm = 1,000 cfm
Q2-4.
(b) Flow rate =
Q2-5.
=
(d) See figure 2-19
Q2-6.
(c) See figure 2-19,(1.0-0.71) * 20/2 = 2.90
Q2-7.
(area of circle)
(a) cfm = Velocity
Q2-8.
cfm = 600 fpm * 3.1416 * (20 * 20/144)/4 = 1,309 cfm
By Fan Laws
Q2-9.
2
Condition
1
10,000
11,000
cfm
rpm
600
660
sp
1.1
1.33
hp
6.0
7.99
Q2-10. rpm = 600 rpm * 4.0/4.5 = 533 rpm (assuming same power to the shaft)
Q2-11. A = fan curve
B = system curve
Point C, point of operation
Q2-12.
Q3-4. True
Q3-l.
False
Q3-5. True
False
Q3-2.
Q3-6. True
False
Q3-3.
B-l
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