Soalan Mengenai Bahan Pendingin

What is the refrigerant that has been used the longest in early cooling systems?

• R-600a

• R-12

• R-134a

• R-717

What are the advantages of R-134a compared to R-12?

• Does not have ODP

• More toxic

• Cheaper

• Easily flammable

What is R-600a known as?

• Isobutane

• Methane

• Propane

• Ammonia

What is the safety symbol for easily flammable refrigerants?

• Red triangle with fire

• Blue circle with water droplet

• Green square with leaf

• Yellow triangle with electrical sign

What refrigerant is commonly used in vehicle AC systems?

• R-12

• R-22

• R-134a

• R-744

Why is R-717 less used in household appliances?

• Very expensive

• Toxic and has a pungent smell

• Inefficient

• Cannot be cooled

What is a mixture of refrigerants known as?

• Azeotrop

• Hybrid gas

• Coolant mix

• Refrigerant blend

What is an example of an azeotropic refrigerant?

• R-500

• R-134a

• R-717

• R-290

Refrigerants that are environmentally friendly usually have an ODP value of:

• 0

• 1

• 10

• 100

What is the main factor in choosing a refrigerant?

• Color

• Price only

• Pressure, safety & environmental impact

• Brand