Question 1

A 4 in. (102 mm) nominal diameter Schedule 10 sprinkler main is to be supported from the structure utilizing a trapeze hanger with a span of 8 ft (2.4 m). Using Schedule 40 pipe for the trapeze hanger, what is the minimum diameter pipe that should be used?

Options :

A : 1.5 in. (40 mm)

B : 2 in. (50 mm)

C : 2.5 in. (65 mm)

D : 3 in. (75 mm)

Answer: B

Question 2

The distance between a hanger and the center line of an upright sprinkler shall be no less than

Options :

A : 3 in. (75 mm).

B : 4 in. (100 mm).

C : 5 in. (125 mm).

D : 6 in. (150 mm).

Answer: A

Question 3

For an existing antifreeze system without a backflow prevention device, what size hole is required in the check valve separating the supply and the antifreeze?

Options :

A : 1 in. (0.79 mm)

B : 1 in. (1.59 mm)

C : 1 in. (3.17 mm)

D : 1 in. (6.35 mm)

Answer: A

Question 4

Which type of pipe does not require a special listing to use threaded fittings?

Options :

A : Schedule 5

B : Schedule 7

C : Schedule 10

D : Schedule 40

Answer: D

Question 5

What is the minimum calculated design area for a light hazard sprinkler system protecting an open office space with a noncombustible acoustic ceiling tile installed 6 in. (150 mm) below the bottom of solid wood joists?

Options :

A : 900 ft2 (83.6 m2)

B : 1,500 ft2 (139.35 m2)

C : 1,950 ft2 (181.1 m2)

D : 3,000 ft2 (278.7 m2)

Answer: B