Refrigeration System Quiz

Which of the following best describes the purpose of a hot gas bypass valve in a refrigeration system?

• To increase subcooling in the condenser

• To maintain evaporator pressure under low-load conditions

• To reduce suction pressure during high-load conditions

• To regulate compressor oil return

When performing an acid test on refrigerant oil, what does a positive result indicate?

• High moisture content in the oil

• Over-lubrication of the compressor

• Presence of non-condensables in the system

• Chemical breakdown due to overheating

A refrigeration system is experiencing high head pressure. Which of the following could be the cause?

• Undersized evaporator coil

• Low refrigerant charge

• Dirty or blocked condenser coil

• Compressor short-cycling

What happens to the pressure inside an accumulator when the compressor is off?

• It equalizes with the evaporator pressure

• It rises above the condenser pressure

• It drops below the suction pressure

• It remains constant

In a parallel compressor rack system, what is the primary function of an oil separator?

• To regulate refrigerant charge

• To prevent liquid slugging in the compressors

• To return separated oil back to the compressors

• To maintain superheat in the suction line

What is the purpose of a CPR (Crankcase Pressure Regulator) valve in a refrigeration system?

• To prevent compressor overload during startup

• To increase refrigerant flow during high demand

• To maintain constant head pressure

• To regulate oil temperature

Which of the following best describes the function of a thermal overload relay in a compressor motor?

• To protect the compressor from over-voltage conditions

• To prevent excessive amperage draw and overheating

• To regulate the start capacitor operation

• To control the speed of the compressor motor

During troubleshooting, a technician finds that a system’s liquid line sight glass shows bubbles. What does this typically indicate?

• The system is overcharged

• The system is undercharged or has a restriction

• The compressor is short cycling

• The condenser is undersized

Which of the following refrigerants has the highest global warming potential (GWP)?

• R-134a

• R-410A

A pressure relief valve is installed on the receiver of a refrigeration system. What is its primary function?

• To prevent compressor overloading

• To prevent excessive pressure buildup and system rupture

• To regulate suction line pressure

• To increase system efficiency under high ambient temperatures