Question 40 QMED03 - Oiler

The Correct Answer is B ### Explanation for Option B (2) **NLGI Grade 2** is the industry standard and the most common grease consistency used across general manufacturing, automotive, and marine applications. This grade offers the ideal balance: it is firm enough to resist slumping, stay in place within bearings, and maintain structural integrity under moderate loads, while still being soft enough to be easily pumped through standard grease guns, centralized lubrication systems, and conventional grease fittings commonly found on marine equipment (such as propeller shafts, rudder posts, pumps, and general machinery). *** ### Explanation of Incorrect Options **A) 00:** NLGI Grade 00 is very soft, semi-fluid grease—similar in consistency to applesauce or a heavy oil. While used in some enclosed gearboxes and specialized centralized lubrication systems where high flowability is essential, it is far too thin for general marine bearing and chassis applications, where the grease needs to resist wash-out and maintain its structure. **C) 4:** NLGI Grade 4 is a very firm, stiff grease. While it offers excellent resistance to heat and pressure, it is generally too hard for standard marine maintenance use. It is difficult to pump, especially at colder temperatures, and may not adequately flow into smaller or tighter bearing clearances, leading to inadequate lubrication. **D) 6:** NLGI Grade 6 is an extremely hard, block-like grease. It is rarely pumpable with standard equipment and is reserved for highly specialized applications, such as large, very slow-moving block bearings or where the grease is packed manually and must remain completely immovable. It is wholly unsuitable for standard marine greasing points.