POWER ENGINEERING 4TH CLASS - A7 QUESTIONS
& ANSWERS
Improper drainage of steam lines could cause:
a. Water hammer
b. Excessive weight to the pipe
c. Low pressure in the lines
d. Excessive steam pressures - Answer -a
A bellows corrugated expansion joint is suitable for pressures up to approximately
_______ kPa:
a. Unlimited
b. 500
c. 1000
d. 2000 - Answer -d
For a given nominal pipe size, as the wall thickness of the pipe increases, the:
a. Bore of the pipe increases
b. Weight of the pipe decreases
c. Outside diameter increases
d. Inside diameter is reduced - Answer -d
Plastic foam pipe insulation is:
a. Often installed by the welders
b. Used for lower temperature purposes
c. Used for refrigeration piping only
d. Used for high temperature service on elbows - Answer -b
A common material used for valve packing is ____________________.
a. Fiberglass
b. Mica
c. Nylon
d. Teflon - Answer -d
Materials used for the manufacture of pipes for power plants MUST be:
a. Welded and stress relieved
b. Suitable for the system operating conditions
, c. Seamless regardless of the operating conditions
d. Manufactured only in Canada - Answer -b
A check valve____________________.
a. Allows flow in one direction only.
b. Uses a heavy spring for setting.
c. requires an inspector's seal to be installed.
d. Has a locking spindle for locking out flow for safety. - Answer -a
Up to and including DN 300 mm pipe, the "nominal pipe size" refers to a pipe's
a. nominal wall thickness
b. nominal outside diameter
c. nominal inside diameter
d. nominal circumference - Answer -c
A slip type expansion joint:
a. will adjust for misalignment of lines
b. requires lubrication
c. is suitable only for low pressures and temperatures
d. requires no maintenance - Answer -b
Which of these valve components is NOT considered to be part of "valve trim"?
a. Disc
b. Seat ring
c. Body
d. Valve stem - Answer -c
The main purpose of insulation on piping systems is to:
a. Prevent condensate from evaporating in the lines
b. Provide a paint surface
c. Allow for the application of line identifier stickers and flow arrows
d. Reduce heat transfer between the pipe and its surroundings - Answer -d
The maximum operating temperature for a carbon steel valve is _________ °C:
a. 280
b. 425
c. 650
d. 1000 - Answer -b
Welding together pipes that are 2 inch nominal size or smaller is usually done using:
& ANSWERS
Improper drainage of steam lines could cause:
a. Water hammer
b. Excessive weight to the pipe
c. Low pressure in the lines
d. Excessive steam pressures - Answer -a
A bellows corrugated expansion joint is suitable for pressures up to approximately
_______ kPa:
a. Unlimited
b. 500
c. 1000
d. 2000 - Answer -d
For a given nominal pipe size, as the wall thickness of the pipe increases, the:
a. Bore of the pipe increases
b. Weight of the pipe decreases
c. Outside diameter increases
d. Inside diameter is reduced - Answer -d
Plastic foam pipe insulation is:
a. Often installed by the welders
b. Used for lower temperature purposes
c. Used for refrigeration piping only
d. Used for high temperature service on elbows - Answer -b
A common material used for valve packing is ____________________.
a. Fiberglass
b. Mica
c. Nylon
d. Teflon - Answer -d
Materials used for the manufacture of pipes for power plants MUST be:
a. Welded and stress relieved
b. Suitable for the system operating conditions
, c. Seamless regardless of the operating conditions
d. Manufactured only in Canada - Answer -b
A check valve____________________.
a. Allows flow in one direction only.
b. Uses a heavy spring for setting.
c. requires an inspector's seal to be installed.
d. Has a locking spindle for locking out flow for safety. - Answer -a
Up to and including DN 300 mm pipe, the "nominal pipe size" refers to a pipe's
a. nominal wall thickness
b. nominal outside diameter
c. nominal inside diameter
d. nominal circumference - Answer -c
A slip type expansion joint:
a. will adjust for misalignment of lines
b. requires lubrication
c. is suitable only for low pressures and temperatures
d. requires no maintenance - Answer -b
Which of these valve components is NOT considered to be part of "valve trim"?
a. Disc
b. Seat ring
c. Body
d. Valve stem - Answer -c
The main purpose of insulation on piping systems is to:
a. Prevent condensate from evaporating in the lines
b. Provide a paint surface
c. Allow for the application of line identifier stickers and flow arrows
d. Reduce heat transfer between the pipe and its surroundings - Answer -d
The maximum operating temperature for a carbon steel valve is _________ °C:
a. 280
b. 425
c. 650
d. 1000 - Answer -b
Welding together pipes that are 2 inch nominal size or smaller is usually done using:
