cold water

Which method is used to prevent scale build-up by influencing the type of calcium crystals precipitated?

• Magnetic

• Electrolytic

• Electronic

• Chemical

Answer explanation

The magnetic method alters the physical properties of calcium crystals, preventing scale build-up by promoting the formation of less adhesive crystal types, making it effective for scale control.

What is the process called when salts and minerals re-form in water as hard limescale?

• Filtration

• Precipitation

• Sedimentation

• Distillation

Answer explanation

The process of salts and minerals re-forming in water as hard limescale is called precipitation. This occurs when dissolved substances exceed their solubility and form solid deposits, unlike filtration, sedimentation, or distillation.

Where are most modern water softeners typically installed?

• In the bathroom

• Under the kitchen sink

• In the attic

• In the garage

Answer explanation

Most modern water softeners are typically installed under the kitchen sink because this location allows for easy access to the plumbing and is close to where softened water is often needed for cooking and cleaning.

Which type of drinking water filter is usually sited underneath the kitchen sink?

• Jug filter

• Plumbed-in filter

• Magnetic filter

Answer explanation

A plumbed-in filter is installed under the kitchen sink and connects directly to the water supply, providing filtered water on demand. In contrast, jug filters are portable and not fixed, while magnetic filters are not commonly used for drinking water.

What is the main function of drinking water filters?

• To remove water hardness

• To improve taste, odour, and appearance of water

• To add minerals to water

• To filter out bacteria

Answer explanation

The main function of drinking water filters is to improve the taste, odour, and appearance of water, making it more palatable and appealing for consumption.

What type of crystals are formed by magnetic water conditioners?

• Needle-like aragonite crystals

• Large calcite crystals

• Small calcite crystals

• None of the above

Answer explanation

Magnetic water conditioners promote the formation of needle-like aragonite crystals, which help reduce scale buildup. This distinguishes them from larger calcite crystals, making 'needle-like aragonite crystals' the correct choice.

Which type of water conditioner uses electromagnetic fields to prevent scale build-up?

• Magnetic

• Electrolytic

• Electronic

• Chemical

Answer explanation

Electronic water conditioners use electromagnetic fields to alter the properties of water, preventing scale build-up. Unlike magnetic or electrolytic types, electronic conditioners specifically utilize these fields for scale prevention.

Which component is used to control the water level in a high-level cistern in a direct boosted cold water system?

• Pressure switch

• Float switch

• Solenoid valve

• Expansion vessel

Answer explanation

The float switch is used to control the water level in a high-level cistern by floating on the water surface. When the water reaches a certain level, the float switch activates or deactivates the water supply, ensuring proper water management.

What is the function of a break cistern in an indirect boosted cold water system?

• To store water before it is pumped

• To heat the water

• To filter the water

• To reduce water hardness

Answer explanation

The function of a break cistern in an indirect boosted cold water system is to store water before it is pumped. This allows for a steady supply of water to be available for distribution when needed.

What is the purpose of a pressure switch in a boosted cold water system?

• To control the water temperature

• To regulate water pressure

• To filter the water

• To reduce water hardness

Answer explanation

The purpose of a pressure switch in a boosted cold water system is to regulate water pressure. It ensures that the system maintains the desired pressure levels for efficient operation.