Book 1 Chapter 15: Piping Materials & Connections

Question 1

A solid billet of steel is used to produce __________ pipe.
A) Welded
B) Seamless
C) Cast iron
D) Flanged

Answer 1

B) Seamless

Question 2

Potable drinking water lines cannot be made from copper.
A) True
B) False

Answer 2

B) False

Question 3

Cast iron has a high resistance to _____________.
A) Intense pressure
B) Corrosion
C) Shock
D) Water hammer

Answer 3

B) Corrosion

Question 4

____________ is used most often in plumbing systems for cold and hot water lines.
A) Cast iron
B) Steel
C) Aluminum
D) Copper

Answer 4

D) Copper

Question 5

An advantage of plastic piping is:
A) Ease of assembly
B) Heavy weight
C) High cost
D) Resistant to high temperatures

Answer 5

A) Ease of assembly

Question 6

After a pipe is cut with a wheel roller cutter, there is a burr left on the outside.
A) True
B) False

Answer 6

B) False

Question 7

Gaskets are added to flanged joints to prevent leakage.
A) True
B) False

Answer 7

A) True

Question 8

For more flexibility in pipe design ________ joints are used.
A) Flanged
B) Threaded
C) Welded
D) Soldered

Answer 8

C) Welded

Question 9

The three general types of flange connections are the screwed, the lapped or loose flange (Van Stone) and the _________ type.
A) Threaded
B) Brazed
C) Soldered
D) Welded
E) Bolted

Answer 9

D) Welded

Question 10

Cast iron has a high resistance to:
A) Corrosion
B) Water pressure
C) Tensile
D) Temperature changes
E) Condensate pressure

Answer 10

A) Corrosion

Question 11

The best material for gaskets in very high temperature areas would be:
A) Nylon
B) Cork
C) Plastic foam
D) Rubber
E) Metallic

Answer 11

E) Metallic

Question 12

Pipe is manufactured in two main categories, welded and:
A) Flanged
B) Soldered
C) Seamless
D) Threaded
E) Brazed

Answer 12

C) Seamless

Question 13

Ring joint gaskets are:
A) Flat
B) Oval in cross-section
C) Hollow
D) Square in cross-section
E) Round in cross-section

Answer 13

B) Oval in cross-section

Question 14

As a piping and pipe fitting material, cast steel is used:
A) Mainly for instrumentation and control piping
B) Extensively for fittings
C) For construction of welded pipe
D) Primarily for special applications
E) For steam traps only

Answer 14

B) Extensively for fittings

Question 15

Gaskets are used in pipe flange joints to:
A) Make up for the misalignment of the pipe
B) Prevent leakage because of small imperfections in the flange face
C) Prevent air ingress in high pressure steam mains
D) Allow for pipe expansion between each flanged joint
E) Provide cushioning in the event of water hammer

Answer 15

B) Prevent leakage because of small imperfections in the flange face

Question 16

Standard commercial pipe size is:
A) Is not manufactured anymore
B) Equal to approximate inside diameter up to 304.8mm
C) Equal to nominal inside pipe diameter
D) Equal to nominal outside pipe diameter
E) Equal to nominal outside diameter up to 254mm

Answer 16

B) Equal to approximate inside diameter up to 304.8mm

Question 17

Screwed connections have threads that conform with which standard?
A) American Mechanical Pipe
B) American Standard Pipe
C) American Society Pipe
D) American Commercial Pipe
E) American National Pipe

Answer 17

B) American Standard Pipe

Question 18

For power plants, materials used for the manufacturing of pipes must be:
A) Cast iron
B) Suited to the operating conditions
C) Case hardened
D) Alloyed with sulphur
E) Seamless stainless steel

Answer 18

B) Suited to the operating conditions

Question 19

Double extra strong pipe is denoted by:
A) ES
B) XXS
C) SS
D) 2S
E) DES

Answer 19

B) XXS

Question 20

Pipe fittings without clearly identified service designation markings should be:
A) Painted as required by the colour code
B) Used only with water systems
C) Rejected
D) Reported to the Boilers Branch
E) Tested and used

Answer 20

C) Rejected

Question 21

When tightening pipe flange bolts:
A) Tighten every second bolt first then tighten the others
B) The top bolts must be tightened first
C) Use a cross-over method
D) The gasket should be glued in place
E) Tighten them in rotation sequence

Answer 21

C) Use a cross-over method

Question 22

What is the wall thickness of a double extra-strong pipe with an actual outside diameter of 42.16mm?
A) 31.75mm
B) 51.93mm
C) 61.56mm
D) 9.70mm
E) 136.25mm

Answer 22

D) 9.70mm

Question 23

A disadvantage of using threads to join pipes and fitting is that it:
A) Is more costly
B) Does not allow for expansion
C) Requires the services of a pipe fitter
D) Weakens the pipe
E) Cannot be repaired

Answer 23

D) Weakens the pipe

Question 24

If a heavier schedule pipe is used, the outside diameter is:
A) Unchanged
B) Larger
C) Smaller
D) Equal to the schedule number
E) Machined to match the other pipe size

Answer 24

A) Unchanged

Question 25

The three types of pipe flange gaskets are: the flat full face, the ring, and the: A) Flat ring B) Segemented ring C) Stacked ring D) Circular ring E) Threaded

Answer 25

A) Flat ring

Question 26

Copper and copper alloy piping and tubing is not used in power plants when: A) Pressure is a prime factor B) Temperature is a prime factor C) Chemicals are used in the application system D) Steam becomes corrosive E) Instrumentation systems require tubing

Answer 26

B) Temperature is a prime factor

Question 27

The most frequently used material for piping in building is: A) Brass B) Cast iron C) Copper D) Wrought iron E) Steel

Answer 27

E) Steel

Question 28

________ are used to provide easy assembly and dismantling of screwed piping connections. A) Elbows B) Couplings C) Valves D) Flanges E) Unions

Answer 28

E) Unions

Question 29

The mass of a two metre length of schedule 40 pipe, nominal size 101.6mm is: A) 11.48kg B) 26.92kg C) 31.9kg D) 8kg E) 12.04kg

Answer 29

B) 26.92kg

Question 30

The piping service symbols “W”, “O”, “G” stand for: A) Water, oxygen, and grease B) Water, oil, gas C) Waste, oxygen, gas D) Water, oil, and glycol E) Tungsten, oxygen, and gallium

Answer 30

B) Water, oil, gas

Question 31

Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the disadvantage of: A) The piping can not be easily assembled or disassembled B) There is no chance of leakage C) Gaskets are not required D) The strength of the pipe is reduced E) A qualified welder must be used

Answer 31

D) The strength of the pipe is reduced

Question 32

One of the general designs of gaskets is the ________ gasket A) Ring joint B) Soft C) Hard D) Round E) Fat

Answer 32

A) Ring joint

Question 33

The flange of the _______ face design has been found to be the most suitable for high pressure and is the easiest to disassemble. A) Tongue and groove B) Flat C) Male and female D) O-ring E) Raised

Answer 33

E) Raised

Question 34

Seamless steel pipe is made from a solid billet of steel which is pierced and rolled is used for _______ service. A) Higher pressure B) oil C) Steam D) Water E) Lower pressure

Answer 34

A) Higher pressure

Question 35

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) Flange fitting C) Elbow D) Adaptor E) Quick couple

Answer 35

A) Coupling collar

Question 36

Threaded cast iron pipe fittings cannot be used for _______ service piping systems. A) Water B) Oil C) Steam D) Chemicals E) Gas

Answer 36

E) Gas

Question 37

Threaded ________ pipe fittings cannot be used for gas service piping systems. A) Aluminum B) Cast iron C) Malleable D) Steel E) Copper

Answer 37

B) Cast iron

Question 38

Gaskets used for higher pressures and temperatures are made from: A) Metal or metal reinforced flexible graphite B) Rubber C) Teflon D) Neoprene E) Cork

Answer 38

A) Metal or metal reinforced flexible graphite

Question 39

One of the general types of pipe flanges used is the ______ flange A) Eight bolt B) Raised face C) Six bolt D) Lapped or slip-on E) Flat face

Answer 39

D) Lapped or slip-on

Question 40

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) Bender B) Cleaner C) Cutter D) Reamer E) Threader

Answer 40

D) Reamer