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MILLWRIGHT 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.
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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
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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:
- 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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