Pipefitter Pipefitting Trade Math 4

Question 1

A pressure gauge reads 85 PSIG. What is the absolute pressure if atmospheric pressure is 14.7 psia?

Accepted Answer

99.7 psia

Answer

70.3 psia

Answer

85.0 psia

Answer

114.7 psia

Question 2

Convert a pipe slope of 1% grade to inches per foot.

Accepted Answer

0.120 in/ft

Answer

0.083 in/ft

Answer

0.100 in/ft

Answer

0.125 in/ft

Question 3

What is the decimal equivalent of 7/16 inch?

Accepted Answer

0.4375

Answer

0.375

Answer

0.500

Answer

0.5625

Question 4

A rectangular duct transition connects to a round pipe. The round pipe has a 12-inch diameter. What is the cross-sectional area of the round pipe? (Use π = 3.1416)

Accepted Answer

113.10 in²

Answer

37.70 in²

Answer

75.40 in²

Answer

150.80 in²

Question 5

A 3-inch pipe (ID = 3.068 in) carries water at 60°F. One gallon of water = 231 cubic inches. How many gallons are in a 10-foot section?

Accepted Answer

3.87 gal

Answer

1.93 gal

Answer

5.80 gal

Answer

7.74 gal

Question 6

What is the offset setback when making a 30° offset with a rise of 10 inches?

Accepted Answer

17.32 inches

Answer

5.0 inches

Answer

8.66 inches

Answer

10.0 inches

Question 7

A pipe rack supports pipes at 6-inch center-to-center spacing. If 14 pipes are on the rack, what is the total width of the pipe bundle?

Accepted Answer

78 inches

Answer

72 inches

Answer

84 inches

Answer

90 inches