Refrigeration System Charging Quiz 7

What safety precautions should be taken when transferring refrigerants?

• Wear gloves and a mask

• Wear a lab coat and safety boots

• Wear goggles and PPEs

• Wear a helmet and gloves

Which type of refrigerant changes states to absorb heat from surrounding areas or substances?

• CO2

• Secondary refrigerants

• Primary refrigerants

• Ammonia

What is the boiling point of R717, a commonly used ammonia refrigerant?

• -33 degrees Celsius

• -78.5 degrees Celsius

• 32 degrees Celsius

• 0 degrees Celsius

What is the most common HFC refrigerant used in domestic and auto air conditioning?

• R-134a

• R-22

• R-717

• R-12

Which method of charging refrigerants is also known as the low side method?

• Low pressure method

• Vapour charging method

• Liquid charging method

• High side method

What happens if a refrigeration system is under-charged?

• Compressor may be damaged due to over-heating

• High pressure readings on both suction and discharge

• Low pressure readings on both suction and discharge

• The system may trip on high pressure switch

What is the remedy for an under-charged refrigeration system?

• Reduce the refrigerant charge

• Locate and correct the leak before charging with the correct amount of refrigerant

• Add more refrigerant to the system

• Add more oil to the system

What is the effect of an over-charged refrigeration system?

• High pressure readings on both suction and discharge

• Low pressure readings on both suction and discharge

• The system may trip on low pressure switch

• Compressor may be damaged due to over-heating

What is the remedy for an over-charged refrigeration system?

• Add more oil to the system

• Add more refrigerant to the system

• Locate and correct the leak before charging with the correct amount of refrigerant

• Reduce the refrigerant charge

What should never be used to apply heat to a refrigerant cylinder?

• Electric heater

• Open flame

• Torch

• Warm water at 32° C