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 CHAPTER 2.
SELF-STUDY QUESTIONS
Q2-l
What three pressures are measured by the pitot tube?
What is the average velocity (fpm) and flow rate (cfm) for the
Q2-2
following nine-point traverse of an 18-inch square duct?
300
450
300
450 (18 inches)
450
600
300
450
300
Q2-3
A duct measures 18 by 20 inches.
The area of the duct in square
feet is:
ft2
2.0
ft2
2.5
ft2
3.0
ft2
3.5
Q2-4
If the average velocity in question 3 above is 400 ft/min, the
quantity of air flowing through the duct in ft3/min (cfm) is:
a.
800
cfm
b.
1,000
cfm
c.
1,200
cfm
d.
1,400
cfm
A pitot tube traverse of a 4-ft2 duct gives a reading of 2 total
Q2-5
pressure (TP) and 1.50 static pressure (SP). The cfm flowing through
12,200
cfm
11,350
cfm
10,960
cfm
8,000
cfm
Q2-6
When making a standard 16-point duct traverse for an 18- by 18-inch
square duct, the first hole drilled should be how many inches away
from the duct wall?
a.
4.50
inches
b.
12.00
inches
c.
9.75
inches
d.
2.25
inches
Q2-7
When making a standard 20-point duct traverse for a 20-inch diameter
round duct, the third measurement should be made how many inches from
the wall?
a.
0.50
inches
b.
1.60
inches
c.
2.90
inches
d.
4.50
inches
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