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WorksheetsL3 Plumbing science pt3
Total questions: 22
Worksheet time: 11mins
Brass is an alloy made from
Copper and tin
Zinc and copper
Copper and aluminium
Bronze and copper
The definition of an alloy is:
It is magnetic
It is a mixture of two or more metals
It is always coloured silver
The main property of the material is heat retention
Low carbon steel is made using:
Low magnetic steel
Lightweight carbon
Iron and carbon
Stainless steel and carbon
MDPE plastic is used for:
Underground cold water supplies
Above ground cold water supplies
Underground hot water supplies
Above ground hot water supplies
Ceramics are used for:
Insulation on cold water pipework
Kitchen cupboard doors for hygiene
Sanitary appliances
Filtration systems for swimming pools
Which of the following is a ferrous metal?
Brass
Copper
Cast iron
Aluminium
Which of the following statements is true about a thermoplastic?
When cold it can be brittle
It remains soft and pliable at any temperature
It cannot be recycled
Once heated it cannot be re-shaped
Hardness describes the ability of a material to resist scratching, bending, abrasion and cutting.
TRUE
FALSE
The term 'conductivity' can refer to both electrical and thermal.
True
False
Ductility is the ability of a material to withstand being pulled, pushed or stretched without breaking.
True
False
Malleability describes the capacity for a material to be cut cleanly by two opposing forces
True
False
Which material can de-zincification take place in?
Aluminium
Brass
Copper
Coal
True or false: Soft water is acidic.
True
False
Which of the following is a build-up of limescale likely to produce:
Unsightly evaporation
Restrictions in flow
Dezincification
Erosion
Which one of the following does not cause erosion?
Turbulence in the water flow
Bad workmanship
Fast-flowing water
Calcium in water
At what temperature is limescale formed in temporary hard water?
65ºC
55ºC
45ºC
35ºC
For rust to form in a plumbing system, which of the following combination of materials/substances must be present?
Water + Limescale + Iron
Oxygen + Iron + Water
Oxygen + Brass + Iron
Iron + Water + Brass
Capillarity in liquids may occur between two close fitting surfaces
When the surfaces are in a horizontal or vertical position
Only when the surfaces are at an angle of 45 degrees
Only when the surfaces are at an angle of less than 30 degrees
Only when the surfaces are in a horizontal position
Capillary attraction would be greatest in tube
A
B
C
D
Which one of the following metals needs to be treated if it is exposed to the effects of atmospheric corrosion?
Iron.
Galvanised steel.
Lead.
Zinc.
The quality of water in the UK is governed by
The water regulations 1999
The British standards
The Building regulations
The water Act
During electrolytic action the
Anode will gradually destroy the cathode
Cathode will gradually destroy the anode
Electrolyte will be used up and disappear
Electrolyte will destroy the cathode
