Refrigeration System Quiz

If a compressor is running with a suction pressure of 65 psig and a discharge pressure of 250 psig using R-22, what is the approximate compression ratio?

• 3.8:1

• 4.5:1

• 5.2:1

• 6.0:1

A refrigeration system requires 45,000 BTU/hr of cooling capacity. If the system operates with a coefficient of performance (COP) of 3.5, what is the approximate power input in kW?

• 2.8 kW

• 3.7 kW

• 4.2 kW

• 5.0 kW

A refrigeration system operates with a suction line temperature of 50°F and an evaporator saturation temperature of 40°F. What is the system’s superheat?

• 5°F

• 10°F

• 15°F

• 20°F

A liquid line in a refrigeration system has a temperature of 90°F, and the condensing saturation temperature is 105°F. What is the subcooling value?

• 10°F

• 15°F

• 20°F

• 25°F

A heat pump operating in heating mode has an outdoor temperature of 40°F and a suction line temperature of 55°F. What is the superheat?

• 5°F

• 10°F

• 15°F

• 20°F

A compressor has a displacement of 30 CFM and operates at 1,750 RPM. If the compressor’s volumetric efficiency is 80%, what is the actual volume of refrigerant moved per minute?

• 22 CFM

• 24 CFM

• 26 CFM

• 30 CFM

A refrigeration system is using a TXV with an external equalizer line. What is the function of the equalizer line?

• To measure the actual pressure at the evaporator outlet

• To prevent excessive refrigerant flow

• To increase compressor efficiency

• All of the above

A heat pump operates in cooling mode and has a refrigerant pressure of 120 psig at the evaporator coil. If the refrigerant is R-410A, what is the approximate saturation temperature of the evaporator?

• 40°F

• 45°F

• 50°F

• 55°F

What is the CFM when 20 is multiplied by 0.85?

• 16 CFM

• 18 CFM

• 20 CFM

• 22 CFM

What is the subcooling when the temperature is 105°F and the reference temperature is 90°F?

• 10°F

• 15°F

• 20°F

• 25°F