Piping Design and Installation 3-1

What is the term for the ability of substances to form an evenly mixed solution?

• Solubility

• Miscibility

• Viscosity

• Density

Which refrigerant is commonly used with mineral oil?

• R-134a

• R-404A

• R-410A

• R-22

What type of oil is used with R-134a refrigerant?

• Vegetable oil

• Synthetic oil

• POE oil

• Mineral oil

What is a critical design consideration for the suction line?

• It should be straight

• It should slope toward the compressor

• It should be the largest diameter

• It should be insulated

What happens when refrigerant velocity is too high?

• Lower pressure drop

• Increased efficiency

• Objectionable noise complaints

• Better oil return

What is the maximum pressure drop goal for the liquid line at design capacity?

• 0°F

• 3°F

• 2°F

• 1°F

What is the primary purpose of oil in a refrigeration system?

• To cool the refrigerant

• To lubricate the compressor

• To act as a refrigerant

• To increase pressure

What can cause gas binding in the receiver?

• Low pressure differential

• High pressure differential

• Excessive oil return

• Increased refrigerant velocity

What is a method to reduce flash gas in a refrigeration system?

• Increase refrigerant temperature

• Install a flash gas tank

• Use larger pipes

• Decrease oil return

What type of copper is required for safe piping?

• Type K and L

• Type M

• Type R

• Type T