CTVET Ghana Certificate II — Plumbing (Ghana)

Under Section 39 of the Ghana Factories, Offices and Shops Act, 1970 (Act 328), which of the following is mandatory in a plumbing workshop where welding or soldering is performed?

• AAdequate ventilation to remove toxic fumes and gases from the breathing zone
• BAir conditioning units running at a maximum temperature of 18 degrees Celsius
• CA dry chemical fire extinguisher placed every three meters along the wall
• DSoundproof insulation on all walls to reduce noise below 30 decibels

What is the minimum personal protective equipment (PPE) required when using a blowtorch to solder a copper joint?

• ASafety glasses, heat-resistant leather gloves, and cotton clothing
• BFace shield, rubber chemical gloves, and a synthetic nylon apron
• CDust mask, latex gloves, and steel-toe boots only
• DOxy-acetylene goggles, welding leather sleeves, and a respirator

How should empty PVC primer and solvent cement cans be disposed of on a Ghanaian construction site?

• ACollected and disposed of at a designated hazardous waste collection point
• BBurned in an open fire pit on site to consume any remaining liquid residue
• CCrushed and buried directly in the soil next to the plumbing trenches
• DRinsed with municipal water and disposed of with general organic waste

A fire breaks out in a plumbing store containing solvent cement, polyurethane sealants, and cleaning solvents. Which class of fire is this, and which extinguisher is appropriate?

• AClass B fire; dry chemical powder or carbon dioxide (CO2) extinguisher
• BClass A fire; pressurized water fire extinguisher
• CClass C fire; wet chemical fire extinguisher
• DClass D fire; metal powder dry agent extinguisher

When cutting a galvanized iron (GI) pipe using an angle grinder, which safety hazard is most critical to control?

• AHigh-velocity metal sparks and flying fragments of the grinding disc
• BStatic electricity buildup on the pipe surface causing electrical shock
• CA sudden loss of hydraulic pressure in the grinder tool handle
• DToxic gas emissions from the internal lead lining of the iron pipe

What is the correct immediate first-aid action for a thermal burn caused by skin contact with hot solder?

• ACool the burn area under clean, running cold water for at least 10 to 20 minutes
• BApply heavy grease, engine oil, or butter to seal the burn from the air
• CPop any blisters that form immediately to drain the fluid and reduce pressure
• DWrap the burn tightly with a dry wool cloth or adhesive medical tape

When placing a straight extension ladder against a wall to access gutter piping, what is the correct safety angle ratio (4:1 rule)?

• AThe base of the ladder should be 1 meter away from the wall for every 4 meters of vertica…
• BThe base of the ladder should be 4 meters away from the wall for every 1 meter of vertica…
• CThe ladder should be positioned at a 45-degree angle relative to the flat ground
• DThe top of the ladder must extend exactly 4 feet above the roof support line

What health risk is associated with overheating or burning PVC pipes while heat-bending or joining them?

• AInhalation of hydrogen chloride gas, which forms corrosive hydrochloric acid in the lungs
• BAbsorption of nitrogen gas through the skin causing joint decompression sickness
• CInhalation of pure carbon monoxide which turns into carbon dioxide inside the blood
• DInhalation of silica dust which causes immediate permanent lung fibrosis

If PVC solvent cement splatters into a plumber's eyes during joint assembly, what is the critical first-aid action?

• AFlush the eyes immediately with clean water for at least 15 minutes and seek medical atte…
• BApply a mild vinegar solution to neutralize the alkaline solvents in the cement
• CRub the eye vigorously with a clean cotton cloth to scrape off the setting glue
• DInstill oily eye drops or mineral oil to dissolve the adhesive compounds

When digging a trench to install an underground drainage pipe in sandy clay soil, at what depth must shoring or trench bracing be installed to prevent cave-ins?

• A1.5 meters (5 feet) or deeper
• B0.5 meters (1.6 feet) or deeper
• C3.0 meters (10 feet) or deeper
• DOnly when groundwater begins to seep into the excavation

What is the correct ergonomic technique for lifting a heavy bundle of galvanized steel pipes from the ground?

• ABend at the knees, keep the back straight, and lift using the leg muscles
• BBend at the waist with straight legs and pull upward using the lower back muscles
• CTwist the torso while lifting to distribute the weight to the shoulder joints
• DLift the load quickly with a sudden jerk to utilize momentum

Before performing maintenance on an electric booster pump, which steps represent the correct Lockout/Tagout (LOTO) safety procedure?

• AIsolate the power supply breaker, apply a personal padlock, attach a warning tag, and tes…
• BSwitch off the pump's local control switch and tell other workers on site not to turn it…
• CUnplug the pump motor wire and wrap the exposed metal terminals with electrical insulatio…
• DTurn off the main municipal water valve to stop water flow while leaving the electrical c…

When using electric hand tools in wet areas or outdoors, what safety device must be connected to the power source?

• AA Residual Current Device (RCD) or Ground Fault Circuit Interrupter (GFCI)
• BA high-capacity step-up electrical transformer
• CA ceramic fuse with a rating of at least 50 amperes
• DAn analog voltage surge protection strip

Which type of respirator mask is required when grinding cast iron pipe or concrete wall channels?

• AA particulate respirator rated at least FFP2 (N95) to filter out fine dust particles
• BA simple paper comfort mask without a rated filtration value
• CA carbon cartridge chemical respirator designed for acid gas removal
• DA surgical mask with fluid-resistant properties

Under Ghana's Factories Act, 1970 (Act 328), whose responsibility is it to ensure that the plumbing workshop floor is kept clear of oil spills, pipe off-cuts, and tripping hazards?

• AThe employer/occupier must provide a safe environment, but workers must maintain cleanlin…
• BThe municipal health inspector who visits the workshop on behalf of the government
• CThe apprentice plumber with the least seniority in the workshop
• DThe client who hired the plumbing shop to perform construction work

Which tool is specifically designed with serrated, adjustable jaws to grip and turn cylindrical steel and galvanized iron pipes?

• APipe wrench (Stillson wrench)
• BAdjustable spanner (shifting wrench)
• CBasin wrench (crowfoot wrench)
• DOpen-ended spanner

What is the primary function of a basin wrench in sanitary fixtures installation?

• ATo tighten or loosen mounting nuts located in tight spaces beneath sinks and wash hand ba…
• BTo cut small-diameter PVC waste pipes in confined toilet cubicles
• CTo clear blockages inside wash hand basin bottle traps and P-traps
• DTo bend chrome-plated copper supply tubes behind pedestal basins

Which tool is used to cut external threads on galvanized iron (GI) water pipes?

• APipe die stock and pipe dies
• BInternal pipe tap
• CHacksaw with a 32 TPI blade
• DMechanical tube reamer

After cutting a copper pipe with a wheel tubing cutter, what step must be taken using the integrated triangular reamer blade?

• ARemove the internal burr to prevent turbulent water flow and localized pipe erosion
• BTaper the outside edge of the pipe to prepare it for solvent cement application
• CExpand the pipe end diameter to create a push-fit socket connection
• DPolish the pipe surface to clean off copper oxide before heating

Why should a plumber use a strap wrench instead of a Stillson wrench when installing chrome-plated brass valves or plastic pipes?

• ATo prevent scratching, crushing, or damaging the finished surface of the material
• BTo apply a higher torque force than a steel pipe wrench can generate
• CBecause strap wrenches lock automatically onto threaded joints without slip
• DTo allow the plumber to cut the pipe while tightening the joint

Which tool should be used to make smooth 90-degree bends in 15mm copper pipe without causing the pipe wall to buckle or collapse?

• AA lever-type mechanical pipe bender or an internal bending spring
• BA bench vise and a heavy ball-peen hammer
• CAn oxy-acetylene torch to heat the pipe until red before manual bending
• DA hydraulic press machine equipped with flat pressing plates

What is the recommended maintenance practice for a manual wheel-type pipe cutter?

• AClean off debris regularly and apply light lubricating oil to the cutter wheel axle and f…
• BSharpen the cutter wheel edge weekly using a coarse grinding wheel
• CWash the tool in soapy water after every use and store it wet to prevent drying out
• DApply heavy adhesive grease to the cutting edge of the wheel to speed up cuts

What is the primary purpose of a manual hydrostatic test pump in plumbing systems?

• ATo pressurize a completed pipe network with water to check for leaks and verify joint int…
• BTo pump out dirty water from flooded drainage trenches before laying pipes
• CTo flush chemical solvents out of domestic supply lines after soldering
• DTo measure the pH and chlorine level of drinking water supply

When using a flaring tool to prepare copper tubing for a flared compression joint, what must be done to the pipe end before applying the flaring cone?

• ASlip the flare nut onto the pipe with the threaded end facing the cut edge
• BApply a thin layer of plumbing flux to the outside wall of the pipe
• CHeat the copper pipe end with a torch until it turns bright yellow
• DWrap three layers of Teflon tape around the outer diameter of the copper tube

What is the critical safety rule when operating a motorized power pipe threader to thread galvanized iron pipes?

• AEnsure the safety foot switch is accessible and keep loose clothing, hair, and gloves awa…
• BHold the pipe firmly with both bare hands close to the cutting die during rotation
• CRun the machine at maximum speed without applying any thread cutting oil
• DLock the safety guard in the open position to inspect the thread depth during operation

Which type of copper tubing has the thickest wall and is suitable for heavy-duty underground water service lines?

• AType K
• BType L
• CType M
• DType DWV

What color stripe is printed along the length of copper pipes to identify Type M tubing?

• ARed
• BBlue
• CGreen
• DYellow

What is the standard socket fusion heating temperature required for joining Polypropylene Random Copolymer (PPR) pipes?

• A260 degrees Celsius
• B100 degrees Celsius
• C180 degrees Celsius
• D350 degrees Celsius

Under modern plumbing standards, what is the maximum lead content permitted in solder used for domestic drinking water lines?

• A0.2%
• B2.0%
• C5.0%
• D50.0%

Which of the following describes the correct sequence for solvent welding a PVC pipe joint?

• ACut and deburr, apply cleaner/primer, apply solvent cement to pipe and socket, insert pip…
• BCut pipe, apply solvent cement, press joint together, and apply primer to the outside of…
• CSand the pipe, heat both ends with a blowtorch, apply solvent cement, and cool with water
• DApply primer, let it dry for 2 hours, apply solvent cement, push together, and twist back…

What is the primary function of Teflon (PTFE) tape when wrapping male threads on a plumbing joint?

• AIt acts as a lubricant to allow tight assembly and fills minor gaps between threads to cr…
• BIt acts as an adhesive glue that permanently bonds the metal threads together
• CIt prevents the pipe from expanding when hot water passes through
• DIt provides electrical insulation to stop static current from crossing the joint

In Ghana, traditional plumbers often wrap hemp fiber (tow) with jointing paste around galvanized iron (GI) pipe threads. What is the technical mechanism of this jointing method?

• AThe hemp fibers swell when wet, blocking micro-gaps, while the paste lubricates and preve…
• BThe hemp fiber acts as a chemical catalyst that melts the iron threads together
• CThe paste acts as a structural solder when heated with a propane torch
• DThe hemp fiber dissolves completely to create a rubber-like gasket inside the thread

Which pipe material and joining method are commonly used for main municipal water distribution lines buried underground in Ghana?

• AHDPE (High-Density Polyethylene); heat butt-fusion welding
• BPPR (Polypropylene Random Copolymer); solvent cement welding
• CPVC (Polyvinyl Chloride); lead soldering
• DABS (Acrylonitrile Butadiene Styrene); compression jointing with hemp

When joining hubless cast iron soil pipe for drainage, what fitting system is used to secure the joints?

• AA neoprene rubber sleeve jacketed by a stainless steel band clamp
• BPouring molten lead and packing oakum into a bell-and-spigot joint
• CApply PVC solvent cement directly to the cast iron surface
• DThreaded couplings screwed onto machine-cut iron pipe threads

Why must expansion loops or offsets be installed in long straight runs of PPR hot water piping?

• ATo absorb physical expansion and contraction caused by temperature changes, preventing pi…
• BTo increase water pressure at the end of a long pipe run
• CTo trap air bubbles and prevent them from entering the geyser water heater
• DTo allow water to cool down before reaching the sanitary tap outlets

Which of the following is correct regarding the standard identification stripes on copper pipes?

• AType K is green, Type L is blue, Type M is red
• BType K is blue, Type L is green, Type M is red
• CType K is red, Type L is blue, Type M is green
• DType K is green, Type L is red, Type M is yellow

When specifying a 20mm nominal size PPR pipe, what does the '20mm' generally refer to?

• AThe approximate outer diameter of the pipe
• BThe exact internal diameter of the pipe bore
• CThe wall thickness of the pipe material
• DThe length of the socket joint weld zone

What is the long-term effect of exposing white or grey PVC water pipes to direct tropical sunlight in Ghana?

• AUltraviolet (UV) radiation degrades the polymer chains, making the pipe brittle and prone…
• BThe sun's heat causes the PVC material to melt and shrink in length
• CDirect sunlight increases the pressure resistance of the PVC pipe wall
• DThe pipe turns into a flexible rubber-like material over time

When connecting a galvanized iron (GI) pipe directly to a copper pipe, what type of fitting must be used to prevent galvanic corrosion?

• AA dielectric union
• BA brass coupling without internal insulation
• CA direct threaded steel socket
• DA copper-plated steel nipple

What is the minimum recommended cure time for a solvent-cemented PVC joint in hot, dry weather before pressurizing the system for testing?

• A2 hours
• B5 minutes
• C24 hours
• D7 days

Which type of fitting allows a mechanical, solderless, and glue-free connection of HDPE pipes using a threaded compression collar and rubber O-ring?

• AHDPE compression fitting
• BPPR socket fusion fitting
• CPVC slip coupling
• DGI threaded coupling

What is the primary role of flux during the soldering of copper pipe joints?

• ATo clean the metal chemically, prevent oxidation during heating, and help solder flow int…
• BTo act as the adhesive that bonds the copper pipe to the fitting socket
• CTo lower the melting temperature of the copper metal pipe ends
• DTo seal any micro-pores in the solder after the joint has cooled down

How do push-fit plumbing fittings (such as SharkBite or similar) create a secure joint on copper or PEX tubing?

• AA stainless steel grab ring grips the pipe while a rubber O-ring seals against the outer…
• BInternal threads on the fitting bite into the outer surface of the plastic pipe
• CA chemical reactant inside the fitting melts the pipe surface upon insertion
• DThe fitting is heated with a match to activate a thermal adhesive liner

When performing PPR socket fusion, what is the consequence of pushing the pipe too far into the heating tool or socket?

• AThe melted plastic rolls inward, creating a restriction or complete blockage inside the p…
• BThe joint becomes highly resistant to thermal expansion stresses
• CThe heating iron cools down too rapidly, causing a cold weld
• DThe outer wall of the pipe becomes thin and loses its pressure rating

What is a key difference between solvent welding ABS pipes and solvent welding PVC pipes?

• AABS solvent welding does not require a chemical primer; only ABS solvent cement is used
• BABS pipes must be heated to 100 degrees Celsius before applying cement
• CPVC solvent cement can be used interchangeably on ABS pipes without issue
• DABS joints must be wrapped with Teflon tape before applying cement

What is the standard length of a commercial galvanized iron (GI) pipe sold in the Ghanaian market?

• A6 meters (approximately 20 feet)
• B3 meters (approximately 10 feet)
• C4 meters (approximately 13 feet)
• D12 meters (approximately 40 feet)

Which fitting is used to create a branch connection at a 90-degree angle from a main pipeline run?

• ATee
• BElbow
• CUnion
• DCoupling