Phase 2 9289 Mock exam

Which gas law predicts that as the pressure of gas in a sealed cylinder increases, at a constant temperature, its volume decreases?

• Boyle's law.

• Charles' law.

• Fourier's law.

• Ohm's law.

At what temperature does water boil at sea level, in kelvins?

• 100 K

• 273 K

• 293 K

• 373 K

What method of heat transfer is shown in Figure 1 to heat the hot water cylinder?

• Radiation.

• Conduction.

• Expansion.

• Convection.

What would happen when increasing the pipe diameter within a system with a constant water pressure supply?

• A decrease in the system volume at the highest point.

• A decrease in the velocity of water after the pipe diameter is increased.

• An increase in the system volume at the lowest point.

• An increase in the pressure of water after the pipe diameter is increased.

Where all systems have the same pipework lengths, which plumbing system would create the least resistance to the flow of water?

• 15 mm diameter pipe, with 1 elbow and 4 machine bends.

• 15 mm diameter pipe, with 2 elbows and 3 machine bends.

• 15 mm diameter pipe, with 3 elbows and 2 machine bends.

• 15 mm diameter pipe, with 4 elbows and 1 machine bend.

What is the electrical current in a 230V circuit with a resistance of 57.5 ohms?

• 0.25 amps.

• 4.0 amps.

• 13.25 amps.

• 16.0 amps.

Calculate the fuse for a 4.5Kw water heater on 230v mains electricity.

• 16-amp fuse.

• 20-amp fuse.

• 32-amp fuse.

• 45-amp fuse.

Which fluid category is wholesome water supplied to domestic dwellings?

• 1

• 2

• 3

• 4

What is an advantage of installing an indirect cold water system in a domestic property?

• It is the cheapest system for labour, material costs and maintenance.

• A reserve of water in the cold water storage can be used as a backup.

• It is the best system to achieve high pressure at all draw-off points.

• Provides wholesome water to all draw-off points within the property.

What are the minimum pipe sizes used on an indirect cold-water system?

• 12 mm for the rising cold main pipe 22 mm for the cold distribution pipe.

• 15 mm for the rising cold main pipe 28 mm for the cold distribution pipe.

• 15 mm for the rising cold main pipe 22 mm for the cold distribution pipe.

• 18 mm for the rising cold main pipe 28 mm for the cold distribution pipe.