PLUMBING 2A CHAPTER #20 EXAM
QUESTIONS AND ANSWERS
The cold water inlet of a water heater is fitted with a _____ . - Answer-dip tube
The outlet of the discharge pipe from a water heater T/P valve must maintain an air gap
above the floor of not more than _____ or less than ______ . - Answer-6″, 1″
When thermal expansion is a problem, a(n) ______ is installed. - Answer-expansion
loop
If the face-to-face distance between a 1/2″ copper ell is 12 1/4″, the length of the
connecting copper pipe will be ______ . - Answer-13 1/4″
How much will a 60′ length of CPVC pipe change in length if it is exposed to a low
temperature of 10°F and a high temperature of 150°F? The coefficient of thermal
expansion for CPVCis 0.38. - Answer-Change in length = Expansion coefficient × (High
temp. - Low temp.) /10 × Length (′) /100= 0.38″ × (150°F - 10°F) /10°F × 60′ / 100′= 0.38
× × = 0.38 × 14 × 0.6= 3.19″
Local plumbing codes generally do not dictate the size of water supply piping. - Answer-
False
It is often desirable to install a branch to the hose bibbs between the water meter and
the water treatment equipment. - Answer-True
Code generally requires water hammer arrestors near washing machines. - Answer-
True
Cold water stub-outs are always installed on the right as you face the fixture. - Answer-
True
A washing machine outlet box includes valves to turn off the water to the washing
machine. - Answer-True
Shower valves are typically installed during the second rough stage of plumbing
installation. - Answer-True
Bathtub spouts are typically installed below the rim of the tub. - Answer-False
CPVC pipe and fittings may be used for both hot and cold water. - Answer-True
The laying length of all 1/2″ fittings is the same size. - Answer-False
QUESTIONS AND ANSWERS
The cold water inlet of a water heater is fitted with a _____ . - Answer-dip tube
The outlet of the discharge pipe from a water heater T/P valve must maintain an air gap
above the floor of not more than _____ or less than ______ . - Answer-6″, 1″
When thermal expansion is a problem, a(n) ______ is installed. - Answer-expansion
loop
If the face-to-face distance between a 1/2″ copper ell is 12 1/4″, the length of the
connecting copper pipe will be ______ . - Answer-13 1/4″
How much will a 60′ length of CPVC pipe change in length if it is exposed to a low
temperature of 10°F and a high temperature of 150°F? The coefficient of thermal
expansion for CPVCis 0.38. - Answer-Change in length = Expansion coefficient × (High
temp. - Low temp.) /10 × Length (′) /100= 0.38″ × (150°F - 10°F) /10°F × 60′ / 100′= 0.38
× × = 0.38 × 14 × 0.6= 3.19″
Local plumbing codes generally do not dictate the size of water supply piping. - Answer-
False
It is often desirable to install a branch to the hose bibbs between the water meter and
the water treatment equipment. - Answer-True
Code generally requires water hammer arrestors near washing machines. - Answer-
True
Cold water stub-outs are always installed on the right as you face the fixture. - Answer-
True
A washing machine outlet box includes valves to turn off the water to the washing
machine. - Answer-True
Shower valves are typically installed during the second rough stage of plumbing
installation. - Answer-True
Bathtub spouts are typically installed below the rim of the tub. - Answer-False
CPVC pipe and fittings may be used for both hot and cold water. - Answer-True
The laying length of all 1/2″ fittings is the same size. - Answer-False
