Preventive Maintenance Quiz

What is the primary purpose of preventive maintenance (PM)?

• To increase the cost of maintenance

• To reduce the number of employees

• To ensure the refrigerating plant and equipment are in good operating condition

• To increase the size of the equipment

Which of the following is a benefit of a good PM program?

• Increased energy consumption

• Increased operating efficiency and a reduction in energy consumption

• More frequent breakdowns

• Higher overall maintenance costs

What should be checked weekly in the compressor lubrication system?

• The type of refrigerant used

• The temperature of the room

• The operation of the compressor lubrication including pump, cooling coil, and heater

• The color of the oil

What should be done if there is a noticeable drop in oil level in the vane seal oiler on centrifugal compressors?

• Add more oil

• Replace the leaking seal

• Ignore it

• Change the compressor

What indicates a small leak in units with centrifugal compressors?

• A change in refrigerant color

• An increase in oil pressure

• The purge pump operating several times per hour

• A decrease in room temperature

What should be done if the system has a positive displacement compressor?

• Increase the room temperature

• Stop the compressor and check the shaft seals for excessive oil leakage

• Change the oil type

• Check the refrigerant type

What should be checked regarding the air filters?

• The temperature of the room

• The type of refrigerant used

• The condition of the air filters, and clean or replace filters if necessary

• The color of the filters