Chapter 15 Piping Materials & Connections

Question 1

1.Threaded _____ pipe fittings cannot be used for gas service piping systems.

A. Steel

B. Cast iron

C. Malleable iron

D. Copper

E. Aluminum

Answer 1

B. Cast iron

Question 2

2. Copper and copper alloys offer great resistance to:

A. Breakage

B. Corrosion

C. Thermal expansion

D. Creep

E. High pressure

Answer 2

B. Corrosion

Question 3

3. Welded steel pipe made from flat steel plates that are rolled and welded is used for _____ service.

A. Higher pressure

B. Lower pressure

C. Steam

D. Oil

E. Water

Answer 3

B. Lower pressure

Question 4

4. Gaskets used for higher pressures and temperatures are made from:

A. FRubber

B. Metal or metal reinforced flexible graphite

C. Neoprene

D. Cork

E. Teflon (PTFE)

Answer 4

B. Metal or metal reinforced flexible graphite

Question 5

5. Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the advantage of:

A. There is no chance of leakage

B. Gaskets are not required

C. The piping can be easily assembled or disassembled

D. A qualified welder must be used

E. The strength of the pipe is not reduced

Answer 5

C. The piping can be easily assembled or disassembled

Question 6

6. Threaded ‘‘cast iron pipe’’ fittings cannot be used for _____ service piping systems.

A. Gas

B. Oil

C. Water

D. Steam

E. Chemicals

Answer 6

A. Gas

Question 7

7. One of the general types of pipe flanges used is the _____ flange.

A. Flat face

B. Six bolt

C. Raised face

D. Eight bolt

E. Lapped or slip-on

Answer 7

E. Lapped or slip-on

Question 8

8. Cast iron has a high resistance to _____ and abrasion and is used for sewage and storm drainage lines.

A. Corrosion

B. Pressure

C. Temperature

D. Thermal expansion

E. Vibration

Answer 8

A. Corrosion

Question 9

9. An advantage of ‘‘plastic piping’’ is:

A. Ease of assembly

B. Ease of corrosion

C. High cost

D. Resistance to high temperatures

E. Ease of corrosion

Answer 9

A. Ease of assembly

Question 10

10. The diameter of commercial pipe is measured by its :

A. Natural pipe size

B. Nominal pipe size

C. Outside diameter

D. Inside diameter

E. Wall thickness

Answer 10

B. Nominal pipe size

Question 11

11. Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the disadvantage of:

A. A qualified welder must be used

B. Gaskets are not required

C. The piping can not be easily assembled or disassembled

D. There is no chance of leakage

E. The strength of the pipe is reduced

Answer 11

E. The strength of the pipe is reduced

Question 12

12. For 152.40 mm (6 inch) nominal pipe size the inside diameter will be:

A. 128.2 mm

B. 202.7 mm

C. 154.1 mm

D. 102.3 mm

E. 90.1 mm

Answer 12

C. 154.1 mm

Question 13

13. For 60.3 mm (2 inch) nominal pipe size the inside diameter will be:

A. 35.1 mm

B. 77.9 mm

C. 62.7 mm

D. 52.5 mm

E. 40.9 mm

Answer 13

D. 52.5 mm

Question 14

14. Seamless steel pipe is made from a solid billet of steel which is pierced and rolled is used for _____ service.

A. Steam

B. Lower pressure

C. Higher pressure

D. Oil

E. Water

Answer 14

C. Higher pressure

Question 15

15. When pipe is cut with a wheel and roller cutter, a burr is left on the inside of the pipe that is removed with a pipe:

A. Cleaner

B. Threader

C. Reamer

D. Cutter

E. Bender

Answer 15

C. Reamer

Question 16

16. Joining or connecting lengths of piping by the use of threaded pipe and screwed connections is generally used for pipe sizes _____ and smaller for low and moderate pressures.

A. 2 in

B. 1/2 in

C. 3 in

D. 3/4 in

E. 1 in

Answer 16

A. 2 in

Question 17

17. Before assembly the threads must be thoroughly cleaned and a small amount of thick lubricant, sometimes called pipe dope, is applied to the:

A. Male pipe threads

B. Female threads

C. Both male and female threads

D. Inside of the pipe

E. Inside of the fitting

Answer 17

A. Male pipe threads

Question 18

18. For 152.40 mm (6 inch) nominal pipe size the inside diameter will be:

A. 128.2 mm

B. 202.7 mm

C. 154.1 mm

D. 102.3 mm

E. 90.1 mm

Answer 18

C. 154.1 mm

Question 19

19. The grooved pipe system uses a joining connection made with a/an _____ that also serves as a union between the fitting and the piping.

A. Coupling collar

B. Elbow

C. Flange fitting

D. Quick couple

E. Adaptor

Answer 19

A. Coupling collar

Question 20

20. Joining or connecting lengths of piping by the use of threaded pipe and screwed connections is generally used for:

A. Low and high pressures

B. Low and moderate pressures

C. Moderate and high pressures

D. Low and moderate temperatures

E. Moderate and high temperatures

Answer 20

B. Low and moderate pressures

Question 21

21. For 21.3 mm (1/2 inch) nominal pipe size the inside diameter will be:

A. 26.6 mm

B. 9.2 mm

C. 12.5 mm

D. 20.9 mm

E. 15.8 mm

Answer 21

E. 15.8 mm