Refrigeration System Quiz

What is the term used to describe the heat exchange process in which a substance changes from liquid to gas?

• Condensation

• Evaporation

• Sublimation

• Fusion

Which of the following tools is most commonly used for checking refrigerant pressures in a system?

• Manifold gauge set

• Multimeter

• Torque wrench

• Micrometer

What is the primary purpose of a vacuum pump in refrigeration system maintenance?

• To remove moisture and air from the system

• To pressurize the system

• To increase refrigerant flow

• To cool the system

What is the function of a contactor in an air conditioning system?

• To regulate the temperature

• To control the flow of refrigerant

• To open and close the electrical circuit

• To measure current

When troubleshooting a compressor that won’t start, which of the following would you check first?

• Compressor motor windings

• The compressor’s refrigerant charge

• The power supply and electrical connections

• The size of the condenser coil

When installing a new refrigerant line, what should be done to ensure proper oil return to the compressor?

• Ensure the line is sloped downward from the evaporator to the compressor

• Ensure the line is level throughout its length

• Ensure the line is insulated at all times

• Ensure the line is connected to the suction side of the compressor

What should be done if a system is found to be contaminated with moisture during a routine check?

• Replace all system components

• Evacuate the system to remove moisture and refill with fresh refrigerant

• Increase the refrigerant charge

• Insulate the refrigerant lines

If an air conditioning unit is running but not cooling, which of the following is the most likely cause?

• The compressor is running too hot

• The condenser coil is dirty or obstructed

• The expansion valve is oversized

• The refrigerant is overcharged

What is the likely cause of a compressor continuously tripping the overload protection?

• Low refrigerant charge

• A faulty start capacitor

• High ambient temperatures

• All of the above

What is the purpose of increasing the pressure of the refrigerant?

• To increase the pressure of the refrigerant

• To decrease the temperature

• To reduce the volume

• To enhance the color