Piping 25-39

The purpose of dehumidifier is to

• remove dust in the room.

• maintain correct room temperature

• remove moisture in the room.

• improve air freshness

High humidity in the room will tends to

• improve air freshness

• improve air circulation

• save energy used

• cause discomfort

If humidity is being reduced, it will

• prevent store goods from spoiling

• cause furniture to warp

• cause tools to rust

• cause mold to grow on surfaces

In dehumidifier operation, the cool air discharge from the evaporator is being passed over to the

• room directly

• capillary tube sensor.

• condenser

• compressor

If humidity in the room is too high, it will

• prevent to furniture to warp

• prevent the mold to grow on surfaces

• cause the mold to grow on surfaces

• prevent the tools from rust

The control device used to control the level of humidity in the room is known as

• Thermostat

• Humidistat.

• Relay  

• Thermistor

The pre-cooler pipe in a water-cooler is used to

• increase the water pressure

• reduce the incoming water pressure

• cool the incoming water

• cool the return water

The water temperature from the water cooler is usually maintain at 

• 20⁰C

• 5⁰C

• 10⁰C  

• 15⁰C

The main purpose of carrying out testing and commissioning of an air conditioning system is to ensure that

• refrigerant   of the system does no flow out.

• system does not give out heat to the atmosphere.

• system is working properly and comply with the requirement before it is handed to the owner.

• condensate water of the system does not flow to the floor trap.

During testing and commissioning process, what data is not required to be taken or record.

• Refrigerant flowrate.

• running ampere.

• discharge pressure.

• suction pressure.