T Level 12.1 Natural and mechanical ventilation systems Class Presentation

Multiple Choice

What is one of the effects that brings about natural ventilation?

• Extraction systems

• Wind effect

• Supply systems

• Balanced ventilation systems

Multiple Choice

Which effect involves warm air being displaced by cold air in natural ventilation?

• Wind effect

• Extraction effect

• Stack effect

• Supply effect

Multiple Choice

Which of the following is a method of mechanical ventilation?

• Wind effect

• Stack effect

• Extraction systems

• Natural air currents

Multiple Choice

What type of system is used in mechanical ventilation to provide air?

• Wind systems

• Supply systems

• Stack systems

• Natural systems

Multiple Choice

Which system is NOT associated with mechanical ventilation?

• Balanced ventilation systems

• Supply systems

• Wind effect

• Extraction systems

Multiple Choice

What causes single-sided ventilation?

• The stack effect created by less dense warm internal air being displaced by denser external colder air.

• The movement of air from high pressure to low pressure areas.

• The use of mechanical fans to circulate air.

• The natural flow of air from open windows.

Multiple Choice

Is single-sided ventilation recommended for deep rooms?

• No, it is not recommended.

• Yes, it is highly recommended.

• Only if the room has high ceilings.

• Only during the summer months.

Multiple Choice

What type of air enters the building in single-sided ventilation?

• Denser external colder air.

• Warm internal air.

• Humid air.

• Polluted air.

Multiple Choice

Which type of air is considered less dense in single-sided ventilation?

• Warm internal air.

• Cold external air.

• Humid air.

• Polluted air.

Multiple Choice

What is the effect of single-sided ventilation on room temperature?

• It helps to cool the room by bringing in colder air.

• It increases the room temperature.

• It has no effect on room temperature.

• It only affects humidity levels.

Multiple Choice

What is the main benefit of cross ventilation in buildings?

• Reduces construction costs

• Improves air circulation

• Increases energy consumption

• Blocks external noise

Multiple Choice

Which of the following best describes cross ventilation?

• Heating system

• Cooling system

• Natural ventilation system

• Artificial ventilation system

Multiple Choice

What is the primary function of a mechanical wind catcher?

• To generate electricity

• To catch the wind flow

• To filter air pollutants

• To reduce noise pollution

Multiple Choice

How does wind pressure affect the air inside a building with a mechanical wind catcher?

• It increases the temperature

• It forces fresh air in and displaces vitiated air

• It reduces humidity

• It creates a vacuum

Multiple Choice

What role do directional diffuser vanes play in a mechanical wind catcher?

• They increase the wind speed

• They direct air towards the exhaust

• They direct air away from the exhaust

• They filter the air

Multiple Choice

What happens in a mechanical wind catcher during no wind situations?

• It stops functioning

• A stack effect provides some venting

• It reverses the airflow

• It increases air pressure

Multiple Choice

What are the two separate ductwork networks in balanced mechanical systems used for?

• Distributing fresh tempered air and extracting vitiated air

• Heating and cooling the air

• Filtering and humidifying the air

• Circulating and dehumidifying the air

Multiple Choice

How does the size of the ductwork change in a balanced mechanical system?

• Increases from the AHU to the final zone

• Remains constant throughout

• Diminishes from the AHU to the final zone

• Expands and contracts randomly

Multiple Choice

What percentage of the extracted air is recirculated and mixed with cold fresh air in balanced mechanical systems?

• 10%

• 25%

• 50%

• 75%

Multiple Choice

What is the process of recirculating and mixing extracted air with cold fresh air called?

• Indirect heat recovery

• Direct heat recovery

• Thermal exchange

• Air purification

Multiple Choice

What controls the proportion of fresh air to recirculated air in balanced mechanical systems?

• Filters

• Fans

• Dampers

• Valves