Red Seal Heavy Duty Equipment Technician Practice Exam

Which of the following indicates a need for lubrication in machinery?

1. Increased vibration

2. Engine cooling

3. Fuel efficiency

4. Sound level reduction

The correct answer is: Increased vibration

Increased vibration is a significant indicator of a need for lubrication in machinery. When the machinery lacks adequate lubrication, moving parts are unable to interact smoothly, leading to excessive friction. This friction causes components to vibrate more than normal as they struggle against one another. The result is heightened vibration levels, which can not only indicate a lubrication problem but also contribute to further wear and potential damage to the machinery if left unaddressed. The other choices do not directly indicate a need for lubrication. Engine cooling relates more to the efficient operation of the cooling system rather than lubrication itself. Fuel efficiency is a measure of how effectively an engine converts fuel into power, which may be affected by many factors, including lubrication, but is not a direct indicator of lubrication needs. Sound level reduction may indicate proper lubrication, yet it is not as definitive an indicator of lubrication requirements as increased vibration.