1 | P a g e MILLWRIG HT LEVEL 2 FINAL EXAM NEWEST 2024 -
2025 ACTUAL EXAM COMPLETE 100 QUESTIONS AND CORRECT DETAILED ANSWERS ( VERIFIED ANSWERS ) |ALREADY GRADED A+ Describe how thrust is controlled with plain bearings for both low and high speed applications. - ANSWER - Oil wedges. Describe radial and axial load. - ANSWER - Radial is horizontal load, axial is vertical. Describe the basic design of Kingsbury bearings. - ANSWER - Faces have a minor pivoted shoes and oil is injected to so during operation the shaft is centered in clearance accurately. What styles do kingsbury bearings come in? (2 points) - ANSWER - Fixed pad and floating or tilting pads. What are the merits of anit -friction bearings? - ANSWER - A lot less friction occurring. Less energy, less heat. 2 | P a g e List the main parts of anti -friction bearings? (3 points) - ANSWER - 2 hardened steel rings, the hardened balls or rollers (rolling elements) and the separator. Describe the operating principle of ball bushings. - ANSWER - Guide rails/shafts using recirculating ball bushings. List the three styles of rolling elements. - ANSWER - Ball, Roller and needles Describe the applications for open bearings, shielded bearings, sealed bearings and sealed and shielded bearings. - ANSWER - Open bearings - oil bath or open lubrication Shielded bearings - keep out solid contaminates Sealed - Keeps out solid contaminates and liquid contaminants. How are directions of bearing loads expressed? - ANSWER - Radial and thrust and combination What are the normal speed ranges for ball bearings and roller bearings? - ANSWER - Ball - 40,000 rpm Rolling - 2000 -20,000 rpm 3 | P a g e How are bearings classified according to their service use? - ANSWER - Type, Service Weight, Bore size. (X, X, XX) What measurements are matched to the code markings on a bearing? - ANSWER - Last two numbers correspond with bore diameter. (00 -10mm, 01 -12mm, 02 -15mm, 03 -17mm) Above 20mm multiply last two digits by 5. Above 480mm, size is directly placed in Briefly describe: a) non -separable bearings b)separable bearings c)non -aligning bearings d)self aligning bearings - ANSWER - a)Non -sperable - designed in single peice b)Separable - Can pull bearing, consist of either 2 or 3 separable parts c)non -aligning - used in machines where the bearings are held in alignment by the bores of the housing d)self -aligning - may be internal or external. outer race is more concave to allow for pivot. Define the following bearing codes: a) SKF06106
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