Phase 2 Mock exam

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

• Avogadro's law

• Boyle’s law.

• Charles’ law.

• Dalton’s law.

On the Kelvin scale, at what temperature does water boil at sea level?

• 373K

• 273K

• 173K

• 293K

If the density of water is 998 kg/m3 and gravity is 9.81 m/s2, what is the resultant pressure at the outlet marked A in the diagram below?

• 44.58 kPa

• 50.91 kPa

• 53.00 kPa

• 58.86 kPa

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

• 0.25 amps

• 4.00 amps

• 13.22 amps

• 287.50 amps

According to the Water Regulations (1999), what is the minimum recommended size of the cold water main entering a new dwelling?

• 15mm

• 20mm

• 22mm

• 25mm

What type of float-operated valve is shown in the image below?

• Part 1.

• Part 2.

• Part 3.

• Part 4.

What is the minimum distance that the invert of an overflow pipe should be above the shut off level in a 230l cold water storage cistern?

• 10mm

• 25mm

• 50mm

• 100mm

What is the minimum distance for A, in the diagram below, when the incoming water main is not insulated within the duct?

• 150mm

• 350mm

• 500mm

• 750mm

An AUK3 air gap must be incorporated within the installation of which appliance?

• Cold water storage system

• Domestic bidet.

• Kitchen sink.

• Wash hand basin.

What is the minimum diameter of the open vent pipe from an indirect hot water cylinder?

• 15mm

• 22mm

• 28mm

• 35mm