13) Which of the following bearings can take thrust loads? a. bushings b. roller
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13) Which of the following bearings can take thrust loads? a. bushings b. roller bearings c. rod and bearings d. single row ball bearings e. angular contact ball bearings f. spherical roller bearings 14) Which of the following is most likely to exacerbate corrosion of materials? a. surface scratches b. material heterogenelty c. crystallinity d. small grain size e. isotropy f. a tensile stress 15) Which of the following has the best resistance to reducing environments? a. stainless steels b. carbon steels c. aluminum alloy d. nickel-based alloys e. zirconium alloy f titanium alloy 16) A typical corrosion allowance for steel outdoors is a. 25 um/year b. 250 nm/year c. 5 um/year d. I mm/year. e. 5 mils/year. f 50 mpy 17) What is the difference between a polymer blend and a polymer alloy? 18) Which of the following is a linear thermoplast? a. PEEK b. phenolic c. polyethylene d. polystyrene e. neoprene f cellulose acetate How do you determine whether a plastic is thermoplastic or thermosetting? What is the difference between a plastic and an elastomer?Explanation / Answer
13. Roller bearings
spherical roller bearings
singlerow angular contact bearings (both radial and axial) but in single direction only.
14. Surface scratches
17. Polymer blends are mixtures of 2 or more polymeric materials regardless of their compatibility whereas a polymer alloy is a mixture of only compatible polymer mixes. The polymer blends may be miscible or immiscible but polymer alloys always have a uniform structure.
18. Polyethylene
19. Thermoplastic can be remelted back in liquid and moulded again and again but thermosetting plastics one formed cannot be remelted back and remain in permanent solid state.
20. Elastomers are the polymers having a capacity to extend twice of its length and returning to original length once the force has been removed but plastics cannot be stretched and remain intact.
21. Polystyrene
Examples of plastic- pVC, Bakelite, melamine
Examples of elastomers - rubber, vulcanised rubber
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