FREE Journeyman Plumbers Isometric Drawings and Math Questions and Answers

Question 1

A plumber needs to create a 45-degree offset in a horizontal pipe run.
If the distance between the centerlines of the two parallel pipes (the offset) is 20 inches, what is the center-to-center length of the travel piece?

Accepted Answer

28.28 inches

Answer

20 inches

Answer

40 inches

Answer

14.14 inches

Question 2

A horizontal drainage pipe that is 48 feet long must be installed with a uniform grade of 1/4 inch per foot. What is the total fall of the pipe from its highest point to its lowest point?

Accepted Answer

12 inches

Answer

6 inches

Answer

24 inches

Answer

8 inches

Question 3

In an isometric plumbing drawing, a pipe is shown as a vertical line. It then turns and runs horizontally away from the viewer and to the right. Which of the following best describes how the horizontal pipe would be drawn?

Accepted Answer

As a line angled at 30 degrees up from the horizontal.

Answer

As a horizontal line running straight to the right.

Answer

As a vertical line running down.

Answer

As a line angled at 45 degrees up from the horizontal.

Question 4

A plumber has a travel piece that is 35 inches long and was installed using two 45-degree fittings. What is the offset distance between the centerlines of the two parallel pipes?

Accepted Answer

24.75 inches

Answer

49.5 inches

Answer

35 inches

Answer

17.5 inches

Question 5

When creating an offset using two 60-degree fittings, the distance between the centerlines of the parallel pipes is 15 inches. What is the approximate length of the travel pipe required between the fittings?

Accepted Answer

17.3 inches

Answer

30.0 inches

Answer

21.2 inches

Answer

15.0 inches

Question 6

An isometric drawing shows a horizontal pipe run that must clear an obstruction by using a vertical offset. If the developed length (travel) of the pipe between the two 45-degree fittings is 50 inches, what is the vertical height (offset) gained?

Accepted Answer

35.35 inches

Answer

70.7 inches

Answer

50 inches

Answer

25 inches

A plumber needs to create a 45-degree offset in a horizontal pipe run.If the distance between the centerlines of the two parallel pipes (the offset) is 20 inches, what is the center-to-center length of the travel piece?

A plumber needs to create a 45-degree offset in a horizontal pipe run.
If the distance between the centerlines of the two parallel pipes (the offset) is 20 inches, what is the center-to-center length of the travel piece?