Latest Machine Design Engineering Multiple choice Questions and Answers pdf

41.    The ratio of endurance limit in shear to the endurance limit in flexure is
(a) 0.33 
(b) 0.4
(c) 0.5 
(d) 0.55
(e) 0.6
Ans: d

42.    For steel, the ultimate strength in shear as compared to ultimate strength in tension is
(a) same 
(b) 1/2
(c) 1/3 
(d) 1/4
(e) 2/3
Ans: e

43.    The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of
(a) 0.25 
(b) 0.45
(r) 0.55 
(d) 0.65
(e)0.75.
Ans: e

44.    At low temperatures (say 75°C) the notched-bar impact value of steel
(a)    increases markedly
(b)    decreases markedly
(c)    remains same
(d)    depends on heat treatment carried out
(e)    none of the above.
Ans: b

45.    A bolt
(a)     has a head on one end and a nut fitted to the other
(b)     has head at one end and other end fits into a tapped hole in the other part to be joined
(c)    has both the ends threaded
(d)    is provided with pointed threads
(e)    requires no nut.
Ans: a

46.    The crest diameter of a screw thread is same as
(a)    major diameter
(b)    minor diameter
(c)    pitch diameter
(d)    core diameter
(e)    none of the above.
Ans: a

47.    If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be
(a) lOVZ 
(b) 10VZtol5Vd
(c) 15Vdto20VZ
(d) 20Vdto30Vd
(e) 30V5"to40Vd.
Ans: d

48.    Maximum principal stress theory is applicable for
(a)    ductile materials
(b)    brittle materials
(c)    elastic materials
(d)    all of the above
(e)    none of the above.
Ans: b

49.    The following type of nut is used with alien bolt
(a)    alien nut
(b)    hexagonal nut
(c)    slotted nut
(d)    castle nut
(e)    any one of the above.
Ans: e

50.    A stud
(a)    has a head on one end and a nut fitted to the other
(b)    has head at one end and other end fits into a tapped hole in the other part to be joined
(c)    has both the ends threaded
(d)    has pointed threads
(e)    requires locking nuts.
Ans: c

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