WorksheetsLCS PPT2 Quiz
Total questions: 28
Worksheet time: 14mins
Which statement best describes LCS usage in installations?
Mostly commercial, rare domestic use
Mostly domestic, rare commercial use
Only used in industrial plant settings
Equally used in both installation types
Match each LCS grade to its colour code.
Light: brown, Medium: blue, Heavy: red
Light: grey, Medium: black, Heavy: white
Light: red, Medium: brown, Heavy: blue
Light: blue, Medium: red, Heavy: brown
All LCS grades share the same external diameter. What varies across grades?
Pipe wall thickness varies by grade
Pipe external diameter varies by grade
Pipe material composition varies widely
Thread pitch standards change with grade
Which grade has the thickest wall and which is most common in plumbing?
Medium is thickest, Heavy most common
Heavy is thickest, Medium most common
Heavy is thickest, Light most common
Light is thickest, Medium most common
Which scenario most appropriately uses heavy grade LCS pipework?
Decorative exposed pipework in dry areas
High temperature and pressurised service runs
Short-term low-pressure space heating loops
Intermittent low-demand domestic water lines
In dry sprinkler installations for fire prevention, which LCS grade is typically selected and why?
Light grade, for specific dry system applications
Heavy grade, for extreme corrosion resistance
Medium grade, for balanced strength and cost
Heavy grade, for below-ground burial requirements
Which statement best describes how a screwed joint achieves a water-tight seal?
By welding pipe ends with filler rod
By mating internal and external threads tightly
By bonding surfaces using solvent adhesive
By clamping ferrules with compression nuts
What is typically applied to the external thread to secure the seal in a screwed joint?
Flux paste and soft solder
Silicone caulk or epoxy resin
Graphite grease or cutting oil
PTFE tape or hemp and paste
In common plumbing practice, how are threads cut on low carbon steel pipework?
Using taps in a tapered reamer
Using compression cutters with ferrules
Using dies in a threader or hand dies
Using knurling tools on a lathe
A parallel pipe thread is tightened into a tapered threaded socket. What happens as the joint is tightened further?
The taper equalizes making pressure constant
The thread strips and loses alignment
The seal tightens as engagement increases
The seal loosens due to reduced contact
When finishing a screwed joint on a pipe, how many thread peaks should remain visible after the fitting is fully tightened?
Three to four threads visible
Two and a half to three threads visible
One and a half to two threads visible
Zero to one threads visible
In pipework, which statement correctly distinguishes male and female threads?
Male threads are metric; female threads are imperial
Male threads are internal; female threads are external
Male threads are tapered; female threads are parallel
Male threads are external; female threads are internal
What does BSPT stand for in plumbing thread specifications?
British Standard Pipe Threads
Basic Steel Pipe Taper
British Standard Parallel Thread
Bore Size Pipe Thread
Which pipe thread sizes are most commonly used in light commercial systems?
1/4 inch and 3/8 inch
1 inch and 1 1/2 inch
1/2 inch and 3/4 inch
1 1/4 inch and 2 inch
In the left image, which fitting changes the direction of a pipe run by ninety degrees?
Bush fitting with hexagonal body
Socket fitting with internal threads
Tee fitting for three-way join
Elbow fitting at a branch
Which component in the left image is intended to create a three-way junction in a pipeline?
Reducer with smaller outlet
Tee forming perpendicular branch
Nipple for short male thread
Socket for female coupling
Identify the fitting in the left image used to join two female-threaded components together.
Elbow direction changer
Bush hex plug reducer
Nipple with external threads
Socket with internal threads
Which fitting in the left image provides a short externally threaded piece to connect two female-threaded fittings?
Reducer bell-shaped adaptor
Elbow ninety-degree bend
Nipple short male thread
Bush internal–external reducer
In the left image, which fitting reduces from a larger female thread to a smaller male or female thread?
Socket straight coupling
Elbow corner connector
Reducer bell-type adaptor
Tee branch junction
According to the right image, what is the primary purpose of a union fitting in screwed pipework?
Allow a break to remove a section
Seal high-pressure joints permanently
Support changes in flow direction
Convert metric threads to BSP
Which statement best describes how a compression fitting achieves a water‑tight seal on low carbon steel pipe?
By compressing a rubber seal onto pipe exterior
By welding a metal sleeve around pipe joint
By gluing a polymer collar over pipe ends
By soldering a brass ferrule to pipe surface
In the illustrated assembly, what is the primary role of the reinforcement washer?
Distributes load to prevent seal deformation
Cuts threads to lock the back nut
Acts as a spring to maintain preload
Provides bonding to weld the components
Which component is tightened to apply axial force that compresses the rubber seal?
Reinforcement washer plate
Back nut on the fitting body
Spring retainer ring
Rubber seal element
What is the function of the spring retainer in this compression fitting stack?
Cuts the pipe to form a tapered seat
Seals the pipe by direct metal‑to‑metal contact
Maintains preload and positions sealing elements
Adheres the washer using chemical bonding
In the first diagram, which compression fitting would you select to join three pipes at right angles to form a branch?
Tee for branching three perpendicular directions
Coupling for straight inline connection only
End-cap for sealing a pipe termination
Elbow for turning one pipe ninety degrees
Look at the second diagram. Which option correctly distinguishes the adapters shown?
Male adapter has external threads, female adapter has internal threads
Male adapter has larger hex nut, female adapter has smaller nut
Male adapter seals with a cap, female adapter seals with a plug
Male adapter is used for bends, female adapter is for straight runs
Which statement best describes the primary purpose of clips used on low carbon steel pipework?
Provide electrical grounding for metallic pipe networks
Improve water flow rate through the installed piping
Prevent noise, movement and damage while offering support
Seal threaded joints to stop fluid leakage
A Munsen ring with a back plate is adjusted mainly to achieve which outcome when securing pipework?
Reduce vibration and movement of the pipe
Increase thermal insulation around the pipe
Allow expansion of water volume in the pipe
Enhance corrosion resistance of the fixing
