Sustainability Aircon Theory Revision

A sling psychrometer can be used to measure

• flowrate and velocity

• dry blub temperature and velocity

• dry bulb temperature and wet bulb temperature

• wet bulb temperature and flowrate

An infra-red thermometer is used to measure

• Temperature

• pressure

• weight

• sound

Which one of the following test is NOT used in predictive maintenance?

• Vibration analysis

• Acoustic analysis

• Leak testing

• Thermographic testing

A check valve in a piping system is used for

• isolating flow

• regulating flow

• controlling flow direction

• isolating and regulating flow

An air-conditioning system using a variable air volume system is NOT suitable for space where

• latent heat is critical

• humidity is critical

• air flow is critical

• pressure is critical

An elbow used in a water piping system to

• regulated the water pressure

• modulate the water flow

• change the water temperature

• change the water flow direction

What is the function of the cooling coil in an air handling unit?

• To cool and dehumidify the mixing air

• To cool and humidify the mixing air

• To heat and humidity the mixing air

• To heat and dehumidify the mixing air

When designing for a new building in Singapore, the room relative humidity of the air-conditioning system should not exceed

• 45%

• 50%

• 65%

• 70%

Four factors affecting thermal comfort are air temperature, humidity, air movement and

• odour

• air change

• air volume

• air cleanliness

The accessory that is used to trap impurities is the

• filter-drier

• suction line accumulator

• check valve

• receiver