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5 Cards in this Set
- Front
- Back
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Which of the following steps is not part of the start-up procedure of centrifugal compressor refrigerating system? 1) Operate the oil pump for at least ten minutes before starting the compressor 2) Open the stop valves in the chilled water system 3) Open the makeup water valve 4) Check the refrigerant levels 5) Open the main circuit breakers |
Open the main circuit breakers |
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Checking the condition of electrical starters and contractors is categorised under which of the following maintenance schedules? 1) Daily maintenance 2) Annual maintenance 3) Monthly maintenance 4) Weekly maintenance 5) Semi-annual maintenance |
Annual maintenance |
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When pumping down a refrigeration system it is recommended to leave _____ residual pressure in the system to prevent air being drawn in through minor leaks or compressor shaft seals. 1) 4 - 14 kPa 2) 7 - 15 kPa 3) 10 - 20 kPa 4) 7 - 14 kPa 5) 5 - 154 kPa |
7 - 14 kPa |
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The safety control in a centrifugal compressor which ensures the compressor to only be started under a no-load condition is called what? 1) Chilled Water Flow Switch 2) Condenser High Pressure Cut out 3) Low Oil Pressure Cut out Switch 4) Vane closed switch 5) Motor demand limiter |
Vane closed switch |
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A centrifugal compressor refrigerating system can be stopped simply by pressing the stop button unless which of the following circumstances is true? 1) The system's auxiliary equipment can be stopped simultaneously 2) The system's auxiliary equipment is not electrically interlocked 3) The compressor can be shut down at the same time as the other equipment 4) None of the above 5) The system is automatically controlled |
The system's auxiliary equipment is not electrically interlocked |
