Test | Cfesa Refrigeration Practice

The primary purpose of the accumulator is to: a) Store liquid refrigerant b) Prevent liquid slugging to the compressor c) Filter debris from oil d) Increase subcooling Section 2: Electrical & Controls 4. A potential relay is commonly used with which type of compressor motor? a) PSC b) CSIR c) CSCR d) Shaded pole

A compressor draws locked rotor amps immediately on start and trips the internal overload. The first step is: a) Replace the compressor b) Check for electrical short to ground c) Check for mechanical seizure d) Measure start capacitor microfarads Section 4: Commercial Refrigeration Specifics 10. In a multiple-evaporator supermarket rack system, oil return to the compressor is maintained by: a) Oil separators and timed oil return valves b) High hot gas pressure c) Continuous compressor operation d) Low superheat settings

Superheat is measured at the: a) Condenser outlet b) Evaporator outlet c) Receiver inlet d) Compressor discharge cfesa refrigeration practice test

The maximum allowable refrigerant leak rate per year for commercial refrigeration under EPA Section 608 (with 50+ lb charge) is: a) 15% b) 20% c) 25% d) 35% Section 5: Safety & Best Practices 13. When recovering refrigerant from a system with a burned-out compressor, you should: a) Recover into the same tank as good refrigerant b) Use a filter drier in the recovery line c) Vent the non-condensables to speed recovery d) Skip recovery if the system is under 5 lbs

A system with high discharge pressure and normal suction pressure could indicate: a) Dirty evaporator coil b) Low refrigerant charge c) Non-condensables or dirty condenser d) TXV bulb losing its charge The primary purpose of the accumulator is to:

A defrost termination thermostat is wired in series with the: a) Evaporator fans b) Compressor contactor coil c) Defrost heater d) Liquid line solenoid Section 3: Troubleshooting & Diagnostics 7. A walk-in cooler has low suction pressure, low superheat, and a starved evaporator. The most likely cause is: a) Overcharge of refrigerant b) Liquid line restriction c) Bad compressor valves d) High evaporator fan speed

A reach-in freezer with hot gas defrost has frost only on the last pass of the evaporator. This indicates: a) Undercharge of refrigerant b) Defrost termination failed open c) TXV stuck open d) Non-condensables in the system The first step is: a) Replace the compressor

If a refrigeration system uses a low-pressure control (LPCO) for pump-down, the control is typically located: a) On the high side, before the receiver b) On the low side, after the evaporator c) At the compressor discharge line d) On the liquid line after the filter-drier