LP hot water cylinder mock

Multiple Choice

Which of the following acts is NOT listed as a reference or legislation document relevant to plumbing and building work?

• Building Act 2004

• Health Act 1956

• Resource Management Act 1991

• Plumbers, Gasfitters, and Drainlayers Act 2006

Multiple Select

Which of the following NZBC clauses are related to water supplies and external moisture?

• NZBC Clause G12

• NZBC Clause E2

• NZBC Clause B1

• NZBC Clause B2

Multiple Choice

Which NZS standard specifically addresses energy efficiency for domestic type hot water systems?

• NZS 4602

• NZS 4603

• NZS 4305

• NZS 4606

Fill in the Blank

The NZ Building Code clause that covers the safe supply, storage, and delivery of hot and cold water is clause ___.

Multiple Select

Which types of low pressure hot water installations are covered in NZBC Clause G12/AS1?

• Low pressure open vented storage water heated systems

• Free Outlet Systems (push through)

• Wet back jacket hot water systems

• High pressure unvented systems

Multiple Choice

Which component in a low pressure open vented storage water heated system ensures that excess water can escape from the water tank?

• Overflow pipe

• Vent pipe

• Drain pipe

• Strainer

Multiple Choice

Which of the following components is responsible for reducing the incoming water pressure in the low pressure open vented storage water heated system?

• Pressure reducing valve

• Expansion control valve

• Non-return valve

• Overflow pipe

Multiple Select

Select all components that are present in both the 'Low Pressure Valve – Vented Water Heater System – Temperature and Pressure Relief Valve' and the 'Low Pressure Valve – Vented Storage Water Heater System – Pressure Relief Valve' diagrams.

• Strainer

• Expansion control valve

• Non-return valve

• Overflow pipe

Fill in the Blank

In a free outlet system (push through), only ___ outlets are to be used for hot water.

Open Ended

What modifications are necessary for open vented storage water heaters in climates subject to freezing, as shown in the last image?

Open Ended

Why is a non-return valve required in storage water heaters supplied by sources other than a water tank?

Multiple Choice

Which of the following is NOT a method for supplying cold water to storage water heaters at a pressure not exceeding their working pressure?

• Water tank

• Pressure reducing valve

• Pressure limiting valve

• Hot water cylinder

Multiple Select

Which of the following are requirements for the structural support of storage water heaters up to 360 litre capacity, as illustrated in Figure 14?

• Adequate support against earthquake forces

• Minimum 50 mm clearance between fitting and support structure

• Fittings and pipework attached through supporting platform or floor

• No need for support if below 200 litres

Fill in the Blank

Wetbacks circulate the water by a thermo-siphon effect, where warmer water rises and cooler water falls, creating a natural flow through the water jacket. Large diameter wetback water pipes (___ mm) are recommended to improve flow.

Multiple Select

Which of the following statements about water jackets in wet back hot water booster systems are correct?

• They are used to transfer heat from the burner to the water.

• They are always made of plastic.

• They come in different shapes and designs.

• They are essential for the functioning of the system.

Multiple Choice

Which of the following is a requirement for fitting Wet Back boosters according to the provided information?

• They must be fitted to approved solid fuel wood burners.

• They must be fitted to gas heaters only.

• They can be fitted to any type of heating appliance.

• They do not require any approval.

Fill in the Blank

The hydraulic gradient is calculated as the difference in hydraulic head divided by the ___ of the flow path.

Open Ended

Explain the importance of the hydraulic gradient in plumbing and water supply systems.

Multiple Choice

According to the diagram, what is the function of the header tank in the wet back hot water booster system?

• To store cold water before it enters the water heater.

• To store hot water for immediate use.

• To increase the water pressure in the system.

• To filter impurities from the water.

Multiple Choice

What are the main skills that people credited with unit standard 30551 are expected to demonstrate?

• Position, install, commission, and maintain low pressure hot water supply systems

• Design high pressure water systems

• Install electrical wiring

• Operate heavy machinery