Refrigeration System Quiz

A refrigeration system has a low suction pressure and low head pressure. What is the most likely cause?

• Overcharged refrigerant

• Compressor short-cycling

• Low refrigerant charge or restriction

• TXV stuck open

What is the primary function of a high-side float metering device?

• To maintain a constant superheat in the evaporator

• To regulate refrigerant flow based on condenser liquid level

• To increase suction pressure

• To prevent compressor overheating

Which of the following is the best method for checking if a refrigeration system is properly charged?

• Checking suction pressure only

• Checking head pressure only

• Measuring superheat and subcooling

• Verifying sight glass clarity

What will happen if a compressor’s suction valve is damaged or leaking?

• High head pressure and low suction pressure

• High suction pressure and low head pressure

• Frost buildup on the suction line

• High amperage draw by the compressor

When troubleshooting an electrically controlled refrigeration system, the technician finds 24V at the thermostat but the compressor does not start. What should be checked next?

• The refrigerant charge

• The high-pressure switch

• The metering device

• The discharge pressure

What could cause excessive compressor discharge temperature?

• Overcharging the system

• Excessive liquid in the suction line

• Low refrigerant charge or high compression ratio

• TXV stuck open

What is the purpose of a solenoid valve in a refrigeration system?

• To control refrigerant flow during system shutdown

• To regulate compressor speed

• To increase refrigerant flow in low ambient conditions

• To maintain constant head pressure

When installing a new refrigeration compressor, what should be done before starting the system?

• Add additional refrigerant to prevent oil starvation

• Open all service valves and energize the compressor immediately

• Perform a triple evacuation to remove moisture and contaminants

• Purge the system with high-pressure refrigerant before charging

What can lead to compressor failure due to the formation of acid in the oil?

• High refrigerant charge

• Formation of acid in the oil

• Low subcooling

• High superheat

What is a possible issue with a failed compressor?

• High subcooling

• Low refrigerant charge

• A failed compressor with leaking valves

• High superheat