9) Which of these are the gear ratio? a) N/NG b) de/dp C) Tp/TG d) wc/wp 10) An
ID: 1867609 • Letter: 9
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9) Which of these are the gear ratio? a) N/NG b) de/dp C) Tp/TG d) wc/wp 10) An important difference between helical gears and spur gears is a) There is an axial load b) The teeth engage more smoothly c) The speed and cost of the helical gears is usually higher d) all of the above 11) In a compound gear train a) There will be only one gear on each shaft b) The train ratio is simply Wout/Win c) There can be different sized gears with 1 to 1 train ratios d) none of the above 12) What is true about Brinell failure a) Usually occurs before Spall failure b) Is due to dynamic rolling forces c) is due to excessive Galvanization d) Is due to metal flaking 13) Which of these do you not need to know to size a bearing? a) The deflection of the shaft at the bearing location b) The load on the bearing c) The desired life of the bearing d) The desired reliability of the bearingExplanation / Answer
9) a) Np / NG and b) dG / dP
10) d) all of the above
11) b) The train ratio is simply wout / win
14) d) To transfer power
15) b) Ultimate Strength
16) b) To simplify complex systems
17) c) DET
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