Mechanical principles of components.

What is the primary function of centrifugal fans in building services engineering?

• To cool down the air

• To filter the air

• To move air through ducting

• To heat up the air

Which of the following is NOT an advantage of centrifugal fans?

• Can withstand overload if capacity exceeded

• Silent operation

• Very durable

• Highly efficient

What principle do axial fans use to avoid turbulent and noisy flow?

• Using a single impeller

• High pressure system

• Using two impellers to create laminar flow

• Centrifugal action

What is the main use of bifurcated axial fans?

• Cooling large industrial spaces

• Extraction of corrosive fumes

• Heating up confined spaces

• Reducing noise in residential areas

What is a characteristic feature of multi-stage centrifugal pumps?

• They have a single impeller

• They are used for low-rise buildings

• They generate very high pressures

• They are primarily used for cooling

How do ground source heat pumps extract heat?

• By extracting heat from the ground

• By using the ambient air temperature

• By using solar energy

• By converting electrical energy into heat

What is the main disadvantage of air source heat pumps compared to ground source heat pumps?

• Cannot be used for cooling

• Requires a lot of ground area

• More expensive to install

• Less efficient in very cold weather

What safety feature is mentioned for oil fired pressure jet burners?

• A backup electrical heating element

• A solenoid valve that cuts off oil supply in the event of flame failure

• An automatic restart function

• A built-in fire extinguisher

What is the purpose of the condensate in a wall mounted domestic gas boiler?

• To provide additional heating

• To cool down the system

• To preheat the return water

• To be reused as drinking water

What does the 'Y' plan in heating controls allow for?

• Provision of hot water and/or heating

• Automatic temperature adjustment

• Remote control via internet

• Solar energy integration