Piping - Class 1
Questions and Answers
- 1.
Nominal pipe size is _______
- A.
ID of the pipe
- B.
OD of the pipe
- C.
Wall thickness of the pipe
- D.
None of the above
Correct Answer
D. None of the aboveExplanation
Nominal pipe size refers to the standardized size designation of pipes, which is based on the internal diameter (ID) of the pipe. It is a convenient way to identify and classify pipes for various applications. The answer "None of the above" is correct because it indicates that nominal pipe size is not determined by the ID, OD, or wall thickness of the pipe, but rather by a standardized size designation system.Rate this question:
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- 2.
Schedule number _____________
- A.
Specifies wall thickness
- B.
Specifies OD
- C.
Specifies wall thickness and OD
- D.
Does not specify anything, is just a nominal number
Correct Answer
A. Specifies wall thicknessExplanation
The schedule number in this context refers to the pipe schedule, which is a standardized system used to specify the wall thickness of pipes. It is a numerical value that indicates the thickness of the pipe's walls, with higher numbers indicating thicker walls. Therefore, the schedule number does indeed specify the wall thickness of the pipe.Rate this question:
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- 3.
Pipe is specified by __________
- A.
ID and Schedule Number
- B.
OD and Schedule Number
- C.
Nominal Pipe Size and Schedule Number
- D.
Nominal Pipe Size and Wall Thickness
Correct Answer
C. Nominal Pipe Size and Schedule NumberExplanation
Pipe is specified by Nominal Pipe Size and Schedule Number. The Nominal Pipe Size refers to the approximate inner diameter of the pipe, while the Schedule Number indicates the thickness of the pipe walls. Together, these two factors determine the overall dimensions and strength of the pipe, making them essential for proper pipe specification and installation.Rate this question:
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- 4.
Two most common pipe materials in our units are _______
- A.
Carbon steel and copper
- B.
Carbon steel and stainless steel
- C.
Stainless steel and plastic
- D.
Carbon steel and plastic
Correct Answer
B. Carbon steel and stainless steelExplanation
The two most common pipe materials in our units are carbon steel and stainless steel. Carbon steel is commonly used for its high strength and durability, making it suitable for various applications. Stainless steel, on the other hand, is known for its corrosion resistance and hygienic properties, making it ideal for industries that require sanitary conditions.Rate this question:
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- 5.
Tube is specified by ________
- A.
Nominal Tube Size and Schedule No.
- B.
ID and wall thickness
- C.
OD and Schedule NO
- D.
OD and wall thickness
Correct Answer
D. OD and wall thicknessExplanation
The tube is specified by its Outer Diameter (OD) and wall thickness. These two parameters determine the size and strength of the tube. The OD refers to the outer measurement of the tube, while the wall thickness indicates the thickness of the tube's walls. Together, these specifications provide important information about the tube's dimensions and suitability for various applications.Rate this question:
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- 6.
Two most common tubing materials in our units are ___________
- A.
Carbon steel and copper
- B.
Carbon steel and stainless steel
- C.
Stainless steel and copper
- D.
Stainless steel and plastics
Correct Answer
C. Stainless steel and copperExplanation
The two most common tubing materials in our units are stainless steel and copper. Stainless steel is a popular choice due to its durability, corrosion resistance, and high temperature resistance. It is commonly used in applications where strength and longevity are important. Copper is another commonly used material due to its excellent heat transfer properties and corrosion resistance. It is often used in plumbing and HVAC systems.Rate this question:
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- 7.
Which of the following flanges is the one used in high pressure and temperature systems?
- A.
Slip on weld
- B.
Socket weld
- C.
Lapped
- D.
Welding neck
Correct Answer
D. Welding neckExplanation
The welding neck flange is the one used in high pressure and temperature systems. This type of flange has a long tapered hub, which provides reinforcement and strength to the flange. The welding neck flange also has a smooth transition from the flange to the pipe, reducing turbulence and maximizing flow efficiency. Due to its design and strength, it is commonly used in applications where high pressure and temperature conditions are present.Rate this question:
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- 8.
Which of the following fittings/couplings uses flexible shaped gasket to seal the pipe joint?
- A.
Grayloc
- B.
Victaulic
- C.
Swagelok
- D.
Gyrolok
Correct Answer
B. VictaulicExplanation
Victaulic fittings/couplings use a flexible shaped gasket to seal the pipe joint. The gasket is made of a flexible material that can conform to the shape of the joint, creating a tight and secure seal. This type of fitting is commonly used in piping systems where there is a need for flexibility and movement, such as in HVAC systems or fire protection systems. The Victaulic fitting's design allows for easy installation and maintenance, making it a popular choice in various industries.Rate this question:
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- 9.
Which of the following fittings/couplings uses two ferrules in series to seal the joint?
- A.
Grayloc
- B.
Victaulic
- C.
Swagelok
- D.
Flare joint
Correct Answer
C. SwagelokExplanation
Swagelok fittings/couplings use two ferrules in series to seal the joint. The two ferrules, known as the front ferrule and the back ferrule, work together to create a reliable and leak-tight connection. The front ferrule forms a seal against the fitting body, while the back ferrule provides support and ensures proper alignment. When the fitting is tightened, the two ferrules compress onto the tubing, creating a strong and secure joint. This design allows Swagelok fittings to provide excellent sealing performance in various high-pressure and high-temperature applications.Rate this question:
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- 10.
From NPS ____ and up, the nominal size corresponds with the OD of the pipe.
- A.
10"
- B.
12"
- C.
14"
- D.
16"
Correct Answer
C. 14"Explanation
From NPS 14 and up, the nominal size corresponds with the OD of the pipe. This means that for pipes with a nominal size of 14 inches or larger, the outer diameter of the pipe will be equal to the nominal size.Rate this question:
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- 11.
Schedule No. 160 is commonly referred to as "extra strong"
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Schedule No.80 is referred to as "extra strong". No. 160 is referred to as "double extra strong".
Schedule No.40 is the "standard".Rate this question:
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- 12.
Used for low pressure water and sewage systems:
- A.
Stainless steel
- B.
Cast iron
- C.
PVC or ABS
- D.
Fibreglass
Correct Answer
B. Cast ironExplanation
PVC or ABS is actually commonly used in sewage systems. However in the nuclear plant cast iron is a much better substitute for the following reasons:
-Longevity
-Strength
-Non-combustible (prevents the spread of fire!)Rate this question:
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- 13.
Used for low pressure, low temperature systems handling corrosives.
- A.
PVC or ABS
- B.
Polybutylene
- C.
Polyethylene
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
All of the above materials (PVC, ABS, Polybutylene, and Polyethylene) can be used for low pressure, low temperature systems handling corrosives. These materials are known for their resistance to corrosion and can withstand the harsh conditions of such systems. They are commonly used in industries where corrosive substances are handled, ensuring the durability and longevity of the system.Rate this question:
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- 14.
Used on condenser tubes to avoid copper and zinc discharge to the lake.
- A.
Stainless steel
- B.
Cast Iron
- C.
Copper
- D.
All of the above
Correct Answer
A. Stainless steelExplanation
Stainless steel is used on condenser tubes to avoid copper and zinc discharge to the lake. This is because stainless steel is highly resistant to corrosion, making it a suitable material for applications where contact with water or other corrosive substances is involved. By using stainless steel, the risk of copper and zinc discharge into the lake is minimized, ensuring environmental protection and compliance with regulations.Rate this question:
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- 15.
The most common joint in our units is the ___________ joint.
Correct Answer
flangedExplanation
The joint consists of two flanges, each welded to a pipe and a gasket put in between them. The two flanges are bolted together with the gasket to seal the joint.Rate this question:
- 16.
The "Grayloc" coupling is for "zero" leakage applications from full vacuum to 420 MPa and temperatures between -220C to 925C.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The Grayloc coupling is designed to provide a "zero" leakage solution for various applications. It can effectively handle a wide range of pressures, from full vacuum to 420 MPa, and temperatures ranging from -220C to 925C. This indicates that the coupling is capable of maintaining a tight seal and preventing any leakage, making the statement true.Rate this question:
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- 17.
The union is easier to assemble and disassemble than the coupling because the pipes don't have to be manipulated.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because a union is a type of pipe fitting that allows for easy assembly and disassembly of pipes without having to manipulate or manipulate the pipes themselves. Couplings, on the other hand, require the pipes to be manipulated and connected together. Therefore, the union is a more convenient option for assembly and disassembly purposes.Rate this question:
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- 18.
Standard pipe length is 18 feet.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Standard length is 22 feet.Rate this question:
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- 19.
High internal pressure for this special coupling translates into high sealing pressure.
- A.
Graylok
- B.
Swagelok
- C.
Ferrule
- D.
Victaulic
Correct Answer
D. VictaulicExplanation
The victaulic coupling has the process fluid pushing the gasked against the pipe. As a result, higher pressure of the process system results in the higher sealing pressure.Rate this question:
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- 20.
Dismountable tube fittings can be grouped into three major groups, flare, compression and _______.
Correct Answer
ferruleExplanation
Dismountable tube fittings can be grouped into three major groups, flare, compression, and ferrule. A ferrule is a small, usually metal, ring or cap used to form a seal or connection between two parts. In the context of tube fittings, a ferrule is used to provide a secure and leak-proof connection between the tube and the fitting. It is typically made of materials like brass or stainless steel and is designed to grip the tube tightly when compressed, ensuring a reliable connection.Rate this question:
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Current Version
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Mar 19, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 06, 2012Quiz Created by
DavidFitzpatrick
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