150589 Plumbing Science

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