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(1) The center distance separability of a pair of involute spur cylindrical gears implies that a change in center distance does not affect the . @NX^__sa
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A. radii of the pitch circles B. transmission ratio C. working pressure angle y
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(2) The main failure form of the closed gear drives with soft tooth surfaces is the . S;*,V|#QD
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A. pitting of tooth surfaces B. breaking of gear tooth ztb2Ign<
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C. wear of tooth surfaces D. agglutination of tooth surfaces Cr(pN[,
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(3) The tooth form factor in calculation of the bending fatigue strength of tooth root is independent of the . J"[OH,/_
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A. tooth number B. modification coefficient C. module t,MK#Ko
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D. helix angle of helical gear c*\^61T
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(4) The contact fatigue strength of tooth surfaces can be improved by way of .
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A. adding module with not changing the diameter of reference circle b^A&K@[W#,
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B. increasing the diameter of reference circle 85s{;3
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C. adding tooth number with not changing the diameter of reference circle yy#Xs:/
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D. decreasing the diameter of reference circle ;1eu8N8
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(5) In design of cylindrical gear drives, b1 = b2 +(5~10)mm is recommended on purpose to . (Where b1, b2 are the face widths of tooth of the smaller gear and the large gear respectively.) \,(t P
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A. equalize strengths of the two gears B. smooth the gear drive 9jvg[H
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C. improve the contact strength of the smaller gear =`/X
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D. compensate possible mounting error and ensure the length of contact line *|` ' L
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(6) For a pair of involute spur cylindrical gears, if z1 < z2 , b1 > b2 , then . WG^D$L:
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(7) In a worm gear drive, the helix directions of the teeth of worm and worm gear are the same. M{(Y|3W
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(8) Because of , the general worm gear drives are not suitable for large power transmission. #}jf TM
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A. the larger transmission ratios B. the lower efficiency and the greater friction loss C8n1j2G\
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C. the lower strength of worm gear D. the slower rotating velocity of worm gear +bQn2PG=
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(9) In a belt drive, if v1, v2 are the pitch circle velocities of the driving pulley and the driven pulley respectively, v is the belt velocity, then . pkM32v-
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A. B. C. D. ~S=h
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(10) In a belt drive, if the smaller sheave is a driver, then the maximum stress of belt is located at the position of going . Z1OcGRN!
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A. into the driving sheave B. into the driven sheave NuXU2w~
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C. out of the driving sheave D. out of the driven sheave v=W%|iZ
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(11) In a V-belt drive, if the wedge angle of V-belt is 40°,then the groove angle of V-belt sheaves should be 40°. yBr{nFOgdY
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A. greater than B. equal to C. less than D. not less than mV'
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(12) When the centerline of the two sheaves for a belt drive is horizontal, in order to increase the loading capacity, the preferred arrangement is with the on top. bRIb'%=+GA
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A. slack side B. tight side rFmE6{4:p
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(13) In order to , the larger sprocket should normally have no more than 120 teeth.
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