1st Year Millwright Lubrication Questions and Answers Latest Version Already Passed

1st Year Millwright Lubrication Questions and Answers Latest Version Already Passed What is the main purpose of lubrication in mechanical systems? To reduce friction and wear between moving parts What happens when there is not enough lubricant in a bearing? The bearing overheats and wears out quickly What type of lubricant is commonly used in high-speed rotating equipment? Light machine oil What is the function of grease in a sealed bearing? To stay in place and provide long-lasting lubrication Why is it important to clean fittings before applying lubricant? To prevent contamination from entering the system 2 What does the term "viscosity" describe in lubrication? The thickness or resistance to flow of a lubricant What can cause oil to become milky or cloudy in appearance? Contamination with water What is the best action to take if contaminated oil is discovered in a gearbox? Drain and replace the oil with fresh, clean lubricant Why is it important to follow the lubrication schedule in the maintenance plan? To ensure reliable operation and prevent early failure What tool is commonly used to apply grease to a fitting? Grease gun What is a common sign of over-lubrication in a bearing? Excess grease being pushed out of the seals 3 What type of lubrication system uses a pump to deliver oil continuously? Circulating lubrication system What is the benefit of using synthetic oil over mineral oil in extreme temperatures? It performs better in both high and low temperatures What is one main advantage of using dry film lubricant? It can operate in environments where traditional oils and greases fail What happens if incompatible lubricants are mixed? Chemical reactions can occur and reduce lubrication performance Why should old grease be cleaned out before adding new grease to a bearing? To avoid mixing greases that may not be compatible What does the color of grease usually indicate? The type or manufacturer; color alone doesn't indicate performance 4 Why is it bad to rely only on color to identify a lubricant? Different products may share the same color but have different properties What property of a lubricant helps prevent metal-to-metal contact under load? Film strength Why is it important to check lubricant levels regularly? To avoid running equipment dry or overfilled What is boundary lubrication? When the lubricant film is very thin and metal surfaces may touch What is the term for solid particles suspended in oil that can cause damage? Contaminants What role does a lubricant play in temperature control? It helps carry away heat from moving components