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