Quiz on Air Conditioning (AC) in Buildings

What aspect of AC systems are learners expected to explain in terms of advantages and disadvantages?

• The color and design of AC systems

• The brand and model specifications of AC systems

• The installation process of AC systems

• The advantages and disadvantages of various AC systems

What is the primary function of an air conditioning (AC) system?

• To provide lighting to a building

• To heat and cool a building as well as control the humidity of the air

• To supply electricity to a building

• To provide internet connectivity to a building

Why is air conditioning provided in buildings?

• To enhance the structural integrity of the building

• To improve the exterior appearance of the building

• To maintain an environment conducive to the health and wellbeing of the inhabitants

• To increase the real estate value of the building

What does 'conditioned' air supply to the inhabitants of a building?

• Noise reduction

• Adequate oxygen, comfortable temperature, and removal of CO2 and odours

• Enhanced security features

• Decorative elements

In central plant AC systems, how is the air distributed throughout the building?

• Through individual AC units in each room

• Via ducting

• Through open windows

• Using ceiling fans

What can be changed to alter the effect of air conditioning in a central plant AC system throughout the building?

• The color of the ducts

• The size of the rooms

• The off-coil temperature

• The type of windows installed

What is the correct sequence of airflow in a central plant AC system as shown in the diagram?

• Fresh air inlet, preheater battery, cooling coil, reheater battery, supply air

• Cooling coil, reheater battery, supply fan, preheater battery, supply air

• Supply fan, cooling coil, reheater battery, fresh air inlet, supply air

• Reheater battery, fresh air inlet, preheater battery, cooling coil, supply air

What is the purpose of the preheater battery in central plant components?

• To cool the air before it enters the room

• To heat the fresh air to 70°C in the winter cycle

• To remove moisture from the air

• To create positive air pressure in the room

How much of the room air can be mixed with fresh air through the recirculation duct?

• Up to 50%

• Up to 25%

• Up to 75%

• Up to 100%

What is the 'duty' of a supply fan in central plant components?

• To create negative air pressure in the room

• To cool the air using chilled water

• To heat the air to the supply air temperature

• To provide the air volume and static pressure required to overcome system resistances