Aircond

How many bar of pressure at low pressure side during operation

• 1 bar

• 2-3 bar

• 3-4 bar

• 12-14 bar

• 20 bar

How many bar on high pressure side during operation of AC

• 1 bar

• 2-3 bar

• 12-20 bar

• More than 22 bar

Function of expansion valve

• To expand the refrigerant

• To produce high pressure refrigerant

• To convert liquid refrigerant to mist form

• To regulate the pressure

What material is inside refrigerant dryer?

• Sodium

• Chlorofluorocarbon

• Carbon

• Silica

Which type of refrigerant is the newest?

• R12

• R22

• R134a

• R1234yf

Which is type of oil is used in Electric Aircond compressor

• PAO

• PAG

• POE

• PPC

Which type of oil used in conventional aircond machine

• PAO

• PAG

• POE

• POC

Why PAG oil once open have to immediately close back?

• Will release toxic gas

• Hydroscopic material

• To prevent air from entering

• No need to seal immediately

What is the change of state in the condensor?

• Solid to liquid

• Gas to liquid

• Liquid to gas

• Liquid to solid

When there is not enough refrigerant in the system, the aircond compressor will shut off. Which sensor does the control use to detect this?

• Refrigerant level sensor

• Aircond temperature sensor

• Evaporator temperature sensor

• Pressure sensor