Steamfitter Pipe Systems and Materials 2

Question 1

What is the function of a reducing coupling in a piping system?

Accepted Answer

To connect pipes of two different diameters in a straight run

Answer

To connect two pipes of the same diameter in a straight run

Answer

To reverse the direction of flow

Answer

To completely isolate a section of piping

Question 2

What type of pipe thread standard is most commonly specified for threaded connections in U.S. steam and water piping systems?

Accepted Answer

NPT (National Pipe Taper)

Answer

BSP (British Standard Pipe)

Answer

ISO metric thread

Answer

Whitworth thread

Question 3

A concentric reducer is different from an eccentric reducer in that a concentric reducer:

Accepted Answer

Keeps the pipe centerlines aligned on the same axis

Answer

Keeps the bottom of both pipes at the same elevation

Answer

Is used only for horizontal pipe runs

Answer

Cannot be used on steam lines

Question 4

Which type of valve is best suited for throttling or regulating flow in a steam piping system?

Accepted Answer

Globe valve

Answer

Gate valve

Answer

Ball valve

Answer

Check valve

Question 5

What is the primary advantage of a flanged connection compared to a threaded connection in a large-diameter steam line?

Accepted Answer

Flanged connections can be disassembled without cutting or unthreading the pipe

Answer

Flanged connections cost significantly less to install

Answer

Flanged connections require no gasket material

Answer

Flanged connections have a lower pressure rating

Question 6

What type of joint is formed when a copper fitting is heated and a filler metal (solder) is drawn into the gap by capillary action?

Accepted Answer

Sweat (soldered) joint

Answer

Threaded joint

Answer

Flanged joint

Answer

Compression joint

Question 7

In the metric piping system used internationally, what does the designation DN (Diameter Nominal) represent?

Accepted Answer

The approximate nominal pipe diameter in millimeters used as a reference size

Answer

The exact outer diameter of the pipe in millimeters

Answer

The pipe wall thickness in millimeters

Answer

The pipe schedule number in the metric system