COSC 325 HOUSTON (PLUMBING) EXAM
(ACTUAL EXAM) WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL
DEFINED ANSWERS LATEST 2025 - 2026
ALREADY GRADED A+
water softener - ANSWERS-a device containing an ion-exchange resin that is
used to treat water by removing ions causing water hardness
types of water softeners - ANSWERS-cabinet and two-tank
three openings on top of gas water heater - ANSWERS-cold water supply, hot
water outlet, relief (t&p) valve
Water Hammer - ANSWERS-The concussion and banging noise that results
when a volume of water moving in a pipe suddenly stops or loses
momentum.
, Water Hammer Arrestor - ANSWERS-A device utilized to absorb the pressure
surge (water hammer) that occurs when
water flow is suddenly stopped in a water supply system.
rough-in - ANSWERS-Installation of all parts of the plumbing system which
can be completed prior to the installation of fixtures
Water test & duration - ANSWERS-plumbing system test in which pipe
openings are sealed and pipe is filled with water to provide a specified
amount of pressure to determine tightness of the system. Must be filled with
water to a point equal to a 10' head. must remain constant for 15 min
potable water supply test & duration - ANSWERS-1.5 times working water
pressure or 150 psi whichever is higher. 12hr to 24hr
FDC - ANSWERS-Fire Department Connection
Above ground pipe material - ANSWERS-Metal
1 CFH (Cubic Feet per Hour) - ANSWERS-1000Btu/h
OSHA requirement for fall protection - ANSWERS-6 feet
OSHA requirement for trenching - ANSWERS-5 feet
Wall thickness terms for copper - ANSWERS-Type L, K, M
(ACTUAL EXAM) WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL
DEFINED ANSWERS LATEST 2025 - 2026
ALREADY GRADED A+
water softener - ANSWERS-a device containing an ion-exchange resin that is
used to treat water by removing ions causing water hardness
types of water softeners - ANSWERS-cabinet and two-tank
three openings on top of gas water heater - ANSWERS-cold water supply, hot
water outlet, relief (t&p) valve
Water Hammer - ANSWERS-The concussion and banging noise that results
when a volume of water moving in a pipe suddenly stops or loses
momentum.
, Water Hammer Arrestor - ANSWERS-A device utilized to absorb the pressure
surge (water hammer) that occurs when
water flow is suddenly stopped in a water supply system.
rough-in - ANSWERS-Installation of all parts of the plumbing system which
can be completed prior to the installation of fixtures
Water test & duration - ANSWERS-plumbing system test in which pipe
openings are sealed and pipe is filled with water to provide a specified
amount of pressure to determine tightness of the system. Must be filled with
water to a point equal to a 10' head. must remain constant for 15 min
potable water supply test & duration - ANSWERS-1.5 times working water
pressure or 150 psi whichever is higher. 12hr to 24hr
FDC - ANSWERS-Fire Department Connection
Above ground pipe material - ANSWERS-Metal
1 CFH (Cubic Feet per Hour) - ANSWERS-1000Btu/h
OSHA requirement for fall protection - ANSWERS-6 feet
OSHA requirement for trenching - ANSWERS-5 feet
Wall thickness terms for copper - ANSWERS-Type L, K, M
