Exam 1 Red Seal PLUMBING
The inner dimensions of a grease interceptor measure 9' long, 4' 6" wide, 5' deep with a
20% free board. What is the liquid capacity in the interceptor in gallons?
a. 1430.40
b. 1565.20
c. 1550.25
d. 1211.76 - ✔️✔️d. 1211.76
What is installed inside a grease interceptor to make it more efficient?
a. Garbage grinder.
b. Bypass valve.
c. Inlet vent.
d. Flow control orifice plate - ✔️✔️d. Flow control orifice plate
If 600ft of piping weighs 900 pounds, 140ft of like piping will weigh?
a. 202
b. 210
c. 217
d. 190 - ✔️✔️B
900lb divided by 600ft = 1.5
Then you multiply 1.5 x 140 = 210
A 60 gallon water heater weighs 52.5lbs when it is empty. How much does it weigh
when it is full?
a. 553
b. 581
c. 564
d. 500 - ✔️✔️a. 553
What would be the result of a partially plugged bypass orifice in a flushometer?
a. Long flush cycle.
b. No flushing.
c. Short flush cycle.
d. Constant flushing. - ✔️✔️a. Long flush cycle.
Two back-to-back water closets are roughed-in at 254 mm (10 in.) from the finished
walls. If the partition is 125 mm (5 in.) hollow tile and the wall finish is 19 mm (3/4 in.)
plaster, what is the c-c distance of the sleeves?
a. 698 mm /27 1/2in.
b. 652 mm /25 3/4in.
c. 335 mm /13 1/4in.
,d. 671 mm /26 1/2in. - ✔️✔️d. 671 mm /26 1/2in.
Which of the following materials is used to make a threaded joint between a galvanized
steel piping and copper tubing?
a. galvanizedextensionpiece
b. dressercoupling
c. brass male adaptor
d. copper extension fitting - ✔️✔️c. brass male adaptor
What is the length of pipe to be removed when cutting out a section of an existing cast
iron building drain to insert an MJ wye?
a. 1/4 to 1/2 in. shorter than the wye.
b. 1/4 to 1/2 in. longer than the wye.
c. Same as the wye.
d. 1/2 to 1 in. longer than the wye. - ✔️✔️b. 1/4 to 1/2 in. longer than the wye.
.
An underground water service is installed using thrust blocks. What additional method
could be used to restrain the joints?
a. Companion flange.
b. Compression coupling.
c. Flared coupling.
d. Continuous rodding. - ✔️✔️d. Continuous rodding.
A heating system requires an in-line flow switch. Where would this type of switch be
located?
a. Supply main.
b. Make-up water line.
c. Return main.
d. Expansion tank line. - ✔️✔️a. Supply main.
Valves, piping and fittings for oxygen service, according to plumbing code? a. do not
need to be cleaned prior to installation
b. should be cleaned thoroughly with a solution of gasoline and kerosene
c. should be cleaned with a warm solution of sodium carbonate - ✔️✔️a. do not need to
be cleaned prior to installation
Gas room heaters installed in hallways in homes for the elderly should?
a. should not have a projecting flue box
b. may be unvented
c. must be vented type
d. should have a projecting flue box - ✔️✔️c. must be vented type
, Water pipe sizing procedure is based upon?
a. loss or gain in static pressure
b. loss of pressure or friction through a water meter
c. A system of pressure losses or requiremen - ✔️✔️c. A system of pressure losses or
requiremen
Which of the following materials is used to make a threaded joint between a galvanized
steel piping and copper tubing?
a. galvanized extension piece
b. dresser coupling
c. brass male adaptor
d. copper extension fitting - ✔️✔️c. brass male adaptor
What is required when installing long, straight horizontal or vertical runs of copper
domestic hot water piping?
a. Pipe insulation.
b. Dielectric unions.
c. Isolation valves.
d. Expansion joints. - ✔️✔️d. Expansion joints.
A cold water pipe is offset 1.2 m using 45° elbows. What is the approximate length of
the diagonal pipe?
a. 1.7 m
b. 1.8 m
c. 2.0 m
d. 1.5 m - ✔️✔️a. 1.7 m
What is the principal function of the expansion tank in a hot water system? a. It acts as
a safety chamber in case of over firing of the boiler.
It collects the air in the system, thus preventing air lock of the system while in operation.
c. It provides the necessary space for the air required in the system.
d. It allows the volume of the water in the system to change to maintain working
pressure - ✔️✔️d. It allows the volume of the water in the system to change to maintain
working pressure
Which applies when installing a single trap for multiple shower drains? a. All drains are
located in the same room, the trap is a minimum of 4 in. and the trap has a cleanout. b.
All drains are located in the same room, the trap is a minimum of 4 in. and no organic
matter can be received by the trap. c. All drains are located in the same room, no
organic matter can be received by the trap and the trap has a cleanout. d. The trap is a
minimum of 4 in., no organic matter can be received by the trap and the trap has a
cleanout. - ✔️✔️c. All drains are located in the same room, no organic matter can be
received by the trap and the trap has a cleanout.
Where is the in-line high pressure sensor for a medical gas system located?
The inner dimensions of a grease interceptor measure 9' long, 4' 6" wide, 5' deep with a
20% free board. What is the liquid capacity in the interceptor in gallons?
a. 1430.40
b. 1565.20
c. 1550.25
d. 1211.76 - ✔️✔️d. 1211.76
What is installed inside a grease interceptor to make it more efficient?
a. Garbage grinder.
b. Bypass valve.
c. Inlet vent.
d. Flow control orifice plate - ✔️✔️d. Flow control orifice plate
If 600ft of piping weighs 900 pounds, 140ft of like piping will weigh?
a. 202
b. 210
c. 217
d. 190 - ✔️✔️B
900lb divided by 600ft = 1.5
Then you multiply 1.5 x 140 = 210
A 60 gallon water heater weighs 52.5lbs when it is empty. How much does it weigh
when it is full?
a. 553
b. 581
c. 564
d. 500 - ✔️✔️a. 553
What would be the result of a partially plugged bypass orifice in a flushometer?
a. Long flush cycle.
b. No flushing.
c. Short flush cycle.
d. Constant flushing. - ✔️✔️a. Long flush cycle.
Two back-to-back water closets are roughed-in at 254 mm (10 in.) from the finished
walls. If the partition is 125 mm (5 in.) hollow tile and the wall finish is 19 mm (3/4 in.)
plaster, what is the c-c distance of the sleeves?
a. 698 mm /27 1/2in.
b. 652 mm /25 3/4in.
c. 335 mm /13 1/4in.
,d. 671 mm /26 1/2in. - ✔️✔️d. 671 mm /26 1/2in.
Which of the following materials is used to make a threaded joint between a galvanized
steel piping and copper tubing?
a. galvanizedextensionpiece
b. dressercoupling
c. brass male adaptor
d. copper extension fitting - ✔️✔️c. brass male adaptor
What is the length of pipe to be removed when cutting out a section of an existing cast
iron building drain to insert an MJ wye?
a. 1/4 to 1/2 in. shorter than the wye.
b. 1/4 to 1/2 in. longer than the wye.
c. Same as the wye.
d. 1/2 to 1 in. longer than the wye. - ✔️✔️b. 1/4 to 1/2 in. longer than the wye.
.
An underground water service is installed using thrust blocks. What additional method
could be used to restrain the joints?
a. Companion flange.
b. Compression coupling.
c. Flared coupling.
d. Continuous rodding. - ✔️✔️d. Continuous rodding.
A heating system requires an in-line flow switch. Where would this type of switch be
located?
a. Supply main.
b. Make-up water line.
c. Return main.
d. Expansion tank line. - ✔️✔️a. Supply main.
Valves, piping and fittings for oxygen service, according to plumbing code? a. do not
need to be cleaned prior to installation
b. should be cleaned thoroughly with a solution of gasoline and kerosene
c. should be cleaned with a warm solution of sodium carbonate - ✔️✔️a. do not need to
be cleaned prior to installation
Gas room heaters installed in hallways in homes for the elderly should?
a. should not have a projecting flue box
b. may be unvented
c. must be vented type
d. should have a projecting flue box - ✔️✔️c. must be vented type
, Water pipe sizing procedure is based upon?
a. loss or gain in static pressure
b. loss of pressure or friction through a water meter
c. A system of pressure losses or requiremen - ✔️✔️c. A system of pressure losses or
requiremen
Which of the following materials is used to make a threaded joint between a galvanized
steel piping and copper tubing?
a. galvanized extension piece
b. dresser coupling
c. brass male adaptor
d. copper extension fitting - ✔️✔️c. brass male adaptor
What is required when installing long, straight horizontal or vertical runs of copper
domestic hot water piping?
a. Pipe insulation.
b. Dielectric unions.
c. Isolation valves.
d. Expansion joints. - ✔️✔️d. Expansion joints.
A cold water pipe is offset 1.2 m using 45° elbows. What is the approximate length of
the diagonal pipe?
a. 1.7 m
b. 1.8 m
c. 2.0 m
d. 1.5 m - ✔️✔️a. 1.7 m
What is the principal function of the expansion tank in a hot water system? a. It acts as
a safety chamber in case of over firing of the boiler.
It collects the air in the system, thus preventing air lock of the system while in operation.
c. It provides the necessary space for the air required in the system.
d. It allows the volume of the water in the system to change to maintain working
pressure - ✔️✔️d. It allows the volume of the water in the system to change to maintain
working pressure
Which applies when installing a single trap for multiple shower drains? a. All drains are
located in the same room, the trap is a minimum of 4 in. and the trap has a cleanout. b.
All drains are located in the same room, the trap is a minimum of 4 in. and no organic
matter can be received by the trap. c. All drains are located in the same room, no
organic matter can be received by the trap and the trap has a cleanout. d. The trap is a
minimum of 4 in., no organic matter can be received by the trap and the trap has a
cleanout. - ✔️✔️c. All drains are located in the same room, no organic matter can be
received by the trap and the trap has a cleanout.
Where is the in-line high pressure sensor for a medical gas system located?
