WorksheetsKEY PLUMBING PRINCIPLES A
Total questions: 20
Worksheet time: 10mins
When water freezes/turns to ice it expands by
5%
10%
15%
20%
At what temperature does water reach its maximum density?
0°C.
1°C.
4°C.
7°C.
The pressure exerted by a liquid can be described as moving in
an outwards direction only
an upwards direction only
a downwards direction only
a downwards and outwards direction.
In figure 1, which one of the calculations listed gives the intensity of pressure of the water entering tank B?
1.5 m × 2 m × 9.81 kN/m³.
5 m × 9.81 kN/m2.
1.5 m × 2 m.
2 × 1.5 m × 2 m × 9.81 kN/m³.
It is important to maintain a ‘self cleansing’ velocity in a waste pipe in order to
prevent excess pressure being created
prevent the build-up of solids
allow the build-up of solids
allow smaller pipes to be used.
Which one of the following appliances can use the principle of siphonic action?
Overhead shower.
Bidet.
Washing Machine.
WC cistern flush mechanism.
If the temperature of water increases, the
density decreases
density stays constant
density increases
mass increases.
The correct unit of measurement for the specific heat capacity of a material is
kg/m3
M3/°C
kJ/kg
kJ/kg/°C.
Which one of the following methods of heat transfer is able to pass through a vacuum?
Radiation.
Convection.
Conduction.
Percolation.
The acidity or alkalinity of water is measured by according to its
pH value
HP value
Hz value
value.
11 Hard water is
alkaline
acidic
salty
polluted.
In a plumbing system it is important that copper pipe is not directly connected to galvanised steel pipe as the
zinc coating will be electrolytically removed
copper will corrode
steel pipe will harden due to the contact with copper
copper will soften due to the contact with the steel pipe.
13 Molten solder is drawn into an end-feed fitting by
siphoning action
atmospheric pressure
capillary action
adhesion.
Which one of the following formulae is used to work out the density of a material?
Density = mass × volume.
Density = mass/volume.
Density = mass × weight.
Density = mass/weight.
Which is the better conductor of heat?
Low density material.
High density material.
Material which is dull in appearance.
Material which is shiny in appearance.
Which one of the following materials expands the most when heated?
Copper.
Steel.
PVC.
Lead.
What method is normally used to prevent atmospheric corrosion forming on black iron central heating pipes?
Connect the metal to a small d.c. electric current.
Polarise the metal using an a.c. negative charge.
Use a coating metal higher in the electromotive series.
Coat the material in an oil based paint.
When installing a pipework system it is important that cross bonding is used when
installing a valve directly adjacent to the electric meter
replacing a section of copper pipework with plastic
removing a section of lead pipework, and replacing with copper
making a final connection to an electrical domestic appliance.
The reason for earth bonding to domestic or industrial metal plumbing systems is to
soften the water
ensure human safety
provide an electrical circuit live
provide an electrical circuit neutral.
A cartridge fuse rating is calculated using which of the following formulae?
Amps = Watts × Volts.
Volts = Watts × Amps.
Amps = Watts ÷ Volts.
Watts = Volts × Amps.
