RFRG 6003 - Compression Refrigeration System Operations (Chp 26) Flashcards
The safety control on a centrifugal compressor that ensures the compressor will only be started under a no-load condition is called what?
A) Vane closed switch B) Condenser high pressure cutout C) Chilled water flow switch D) Low oil pressure cutout switch E) Motor demand limiter
A) Vane closed switch
Which of the following code books deals with refrigeration systems?
A) ASNI B) CSA B52 C) ASME Section IV D) ASME Section VII E) CSA B51
B) CSA B52
Before starting a compression refrigeration system:
A) Close louvers to engine room air make up units
B) Open the condenser fan breakers
C) Ensure that compressor oil level and temperature is within specification
D) Make sure recycle timer is engaged
E) Shut off engine room fans
C) Ensure that compressor oil level and temperature is within specification
Which of the following steps is “not part of the start-up procedure” of “centrifugal compressor” refrigerating system?
A) Open the stop valves in the chilled water system
B) Check the refrigerant levels
C) Open the makeup water valve
D) Open the main circuit breakers
E) Operate the oil pump for at least 10 minutes before starting the compressor
D) Open the main circuit breakers
Refrigeration systems:
A) Require operators to be familiar with the system
B) Do not require supervision
C) Start automatically and need no operator input
D) Will shutdown automatically if there is a problem
E) Are standard and operated in similar ways
A) Require operators to be familiar with the system
When some refrigeration systems are to be shutdown for a prolonged period of time they should be “pumped down” and the refrigerant stored in the:
A) Accumulator B) Receiver C) Compressor D) Evaporator E) Supply cylinders
B) Receiver
When starting a compression refridgeration system after ensuring that all components and auxiliaries are properly energized:
A) Open the suction
B) Check the pressure cutouts and interlocks
C) Close the water supply to the condenser
D) Shut the king valve
E) Push the start button
B) Check the pressure cutouts and interlocks
Before starting a compression refrigeration system:
A) Close the expansion valves B) Bleed the discharge check valve C) Check compressor oil D) Close the compressor discharge E) Close the king valve
C) Check compressor oil
If the compressor suction pressure is too high it may be due to:
A) Broken compressor suction valves B) Too much load on the evaporator C) All of the above D) None of the above E) Expansion valve is stuck open
C) All of the above
A system of regularly scheduled inspections and lubrications along with the adjustments, minor parts replacement and minor repairs necessary to keep the refrigerating plant and equipment in good operating condition is defined as what:
A) None of the above B) Routine operation C) Safety controls D) Preventative maintenance E) Regular maintenance
D) Preventative maintenance
