Question

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True or False, one point each, Write down F (false) or T (true). (01) In a mechanical design, it is recommended to use standard size/dimension to overcome uncertainties in stress or material strength. (02) Steels' surface fatigue strength can be correlated to their Brinell hardnesses. (03) If a material point has three principal stresses 01 = 02 = 03 = 300kpsi, then the maximum shear stress is Tmax = 150kpsi. (04) The endurance limit of a material is independent on the size of a part. (05) The tensile stress in a bolt is usually calculated through tensile force divided by area of unthreaded rod's cross-section area. (06) Edge shear-out or tear-out is one failure mode in bolted or riveted joints. (07) Pretension of bolts can be controlled by a torque wrench. (08) The material ultimate tensile strength of a spring coil is dependent on its coil diameter. (09) Adhesive joints are much stronger in tensile loading than shear loading (10) The dominated loading condition in a helical spring is torsion along coils. (11) The principal advantage of conical springs is that the its spring rate is nonlinear. (12) The dimensions of a bearing is coded by two-digit series numbers according to ABMA, one digit for width and the other one for diameter. (13) Three key things to determine selection of bearing are load, life and reliability. (14) Straight roller bearings can carry large radial loads and small amount of axial load. (15) In the AGMA method of gear analysis, gear strength values are the true material strengths. (16) A planetary gear train allows for two degrees of freedom.

Answer 1

0 True to overcome dimensions we Standeerd un generally used incertainity comy d² 11.2 mm. of stress. Ex. : If calculated diameter and standard diameter 12 mm then we mm as ovu dome size of object to Umarfainile in stress. True. EDIf sus face hardness is very high then it is difficult to produes a crack on surface so surface fatigue life increase. Both can be Correllal ed high value 6 = 300 62 = 300, 03-30 0 Zmax max { dire 626, 6-1) max (0,0,0) Tmax=0 1 so is False" statement given @ False endurance we considu linst does depend on the size of part. sire factor cohil colculating endurance endurana limit of given object 5 False * Tensile strength Tensile fora Threaded area. Wewe threaded area and not unthreaded ,پایه True @ Tru. (8) True @ False They story in shear then tension

(to False. Dominant loading conditions ciu eithes tension or Compression. (1) True (18 False 18 True 14) True 15 False 16 Tome

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