Worksheets150589 Plumbing Science
Total questions: 23
Worksheet time: 12mins
In the si of units, the flow rate of electricity is called.
Current and measured in amps
Resistance and is measured in volts
electro - motive force and is measured in volts
Power and is measured in watts
In terms of mechanical principles, equilibrium is the condition in which all forces acting upon an object are
Cancelling each other out to allow an object to accelerate
all acting in the same direction to create a mechanical advantage
Cancelling each other out to leave the object stationary
all acting in the same direction to create a change in the center of gravity
Pipes with rough internal walls are likely to cause:
a reduction in flow rate
an increase in water pressure
a decrease in water pressure
an increase in flow rate
The head between the cold water tap and the cold water storage cistern is 4m therefore the static head at the tap is
4 bar
0.4 kpa
4 kpa
0.4 bar
The flow rate of a combination boiler when operating in hot water mode is normally measured in
bar
kj
l/s
kpa
Force is measured in newtons on the si system of units the formula for calculating is
force = pressure x area
force = mass x area
force = mass x acceleration
force = work x distance
Name this heat transfer method
condensation
radiation
transmission
convection
The relation between watts and joules is that 1 watt =
1 j/s
1 kj/s
1 j/m
j/ms
Water from gas to a liquid?
melting
condensating
freezing
evaporation
The boiling point of water on the Celsius and Kelvin scales?
100° and 273k
100° and 373k
-273° and 100k
100° and 100k
Gasses exit pressure?
down
up
all directions
down and sideways
Which of the following is most likely to require a refrigerant gas?
a heat pump
a solar thermal collector
a water softener
an expansion vessel
What is the name of the process which is used to help with soldering?
Adhesion
Hardness
Cohesion
Capilliary
At sea level water will change state from liquid to gas if heated in an open container at the temp of?
100°C
104°C
101°C
99°C
A glycogen solution is put in a plumbing system to prevent...
Over heating
Bloch gas
Freezing
Leaks
Which of the following pipes would be suitable for an external soil stack so as to avoid violet degradation?
Unplasticated polyvinyl chloride
Polyethylene
Polypropylene
HDPE
It is important that copper is not connected to galvanised steel...
Copper will corrode the internal surface of the pipe
Copper will oxidise due to the contact with the steel pipe
Steel pipe will erode molecules of copper due to the electrolytic action
2 inch will be removed from the galvanised pipe by electrolytic corrosion
Copper pipes can be pulled into bends because...
has elasticity
is hard
has durability
is ductile
The correct material for soldering joints on copper pipes containing potable/ wholesome water is..
Lead free solder
Leaded solder
Braising rod
tig welding
What material is bronze made out of?
an alloy of tin, lead and copper
an alloy of tin and lead
an alloy of copper, tin and zinc
an alloy of tin and copper
At sea level 1 meter cubed of water has a mass of 1000kg and 1 meter cubed of copper has a mass of 8940kg therefore copper has a relative density of...
89.4
8.94
894
0.894
In Si units the floor area is calculated in...
meters squared
litres
sections
meters cubed
The Si unit for thermodynamic or absolute temperature is...
kelvin
herms
degrees
Celsius
