CLS Lubrication Systems & Maintenance 2 — Questions and Answers
Question 1: What is the primary purpose of a centralized lubrication system in industrial equipment?
- To reduce lubricant viscosity over time
- To deliver precise lubricant quantities to multiple points automatically (Correct answer)
- To filter contaminants from used oil
- To cool bearings during high-speed operation
Correct answer: To deliver precise lubricant quantities to multiple points automatically
Centralized lubrication systems automatically deliver measured amounts of lubricant to multiple points simultaneously, reducing downtime and ensuring consistent lubrication.
Question 2: In a single-line parallel lubrication system, what happens when the main line pressure is released?
- Injectors reset to prepare for the next lubrication cycle (Correct answer)
- Oil drains back to the reservoir
- Bearings receive a second dose of lubricant
- The system switches to manual operation
Correct answer: Injectors reset to prepare for the next lubrication cycle
When pressure is released in a single-line parallel system, the injectors reset (recharge) with lubricant, readying them for the next pressurization cycle.
Question 3: Which lubrication system type uses divider valves to distribute lubricant sequentially to each outlet?
- Single-line parallel system
- Dual-line system
- Progressive system (Correct answer)
- Oil mist system
Correct answer: Progressive system
Progressive systems use divider valves that cycle sequentially, each valve activating the next, ensuring lubricant is delivered to each point in a fixed order.
Question 4: What is the primary advantage of a dual-line lubrication system over a single-line system?
- Lower initial cost
- Ability to serve longer line distances and more lubrication points (Correct answer)
- Uses less lubricant per cycle
- Requires no pressure relief valve
Correct answer: Ability to serve longer line distances and more lubrication points
Dual-line systems can cover greater distances and serve more lubrication points than single-line systems because two main lines alternate under pressure.
Question 5: In an oil mist lubrication system, what is the typical particle size range for the oil mist?
- 0.1 to 2 micrometers
- 5 to 10 micrometers (Correct answer)
- 20 to 50 micrometers
- 100 to 200 micrometers
Correct answer: 5 to 10 micrometers
Oil mist systems generate particles of approximately 1–5 micrometers (commonly cited range 5–10 µm depending on standard), small enough to remain airborne and penetrate bearing clearances.
Question 6: Which maintenance strategy involves replacing or servicing components based on time intervals regardless of their condition?
- Predictive maintenance
- Condition-based maintenance
- Preventive (time-based) maintenance (Correct answer)
- Run-to-failure maintenance
Correct answer: Preventive (time-based) maintenance
Preventive (time-based) maintenance schedules service at fixed intervals regardless of actual component condition, ensuring reliability through regular attention.
Question 7: What does an automatic lubricator (single-point lubricator) primarily use to dispense grease or oil?
- Hydraulic pump pressure
- Electromechanical or electrochemical gas-generating mechanism (Correct answer)
- Gravity feed from an elevated reservoir
- Compressed plant air
Correct answer: Electromechanical or electrochemical gas-generating mechanism
Single-point automatic lubricators use an electromechanical motor or an electrochemical reaction generating gas to steadily push lubricant into the bearing at a controlled rate.
CLS Lubrication Systems & Maintenance 2
What is the primary purpose of a centralized lubrication system in industrial equipment?