Objective Machine Design Questions and Answers pdf

71.    The pitch of threads on a Jock nut in comparison to pitch of nut is
(a) same
(b) coarser
(c) finer
(d) very coarse
(e) very fine.
Ans: a

72.Buttress threads are usually found on
(a)    screw cutting lathes
(b)    feed mechanisms
(c)    spindles of bench vices
(d)    screw jack
(e)    railway carriage couplings.
Ans: e

73.    In order to obtain bolt of uniform strength
(a)    increase shank diameter
(b)    increase its length
(c)    drill an axial hole through head upto threaded portion so that shank area is equal to root area of thread
(d)    tighten die bolt properly
(e)    all of the above.
Ans: c

74.    A key capable of tilting in a recess milled out in a shaft is known as
(a)    wood-ruff key
(b)    feather key
(c)    flat saddle key
(d)    gib head key
(e)    hollow saddle key.
Ans: a

75.    A key made from a cylindrical disc having segmental cross-section, is known as
(a)    wood-ruff key
(b)    feather key
(c)    flat saddle key
(d)    gib head key
(e)    hollow saddle key.
Ans: a

76.    A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as
(a)     wood-ruff key
(b)    feather key
(c)    flat saddle key
(d)    gib head key
(e)    hollow saddle key.
Ans: c

77.    Fibrous fracture occurs in
(a)    ductile material
(b)    brittle material
(c)    elastic material
(d)    hard material
(e)    all of the above.
Ans: a

78.    Turn buckle has
(a)     right hand threads on both ends
(b)     left hand threads on both ends
(c)    left hand threads on one end and right hand threads on other end
(d)    no threads
(e)    threads in middle portion.
Ans: c

79.    Eye bolts are used for
(a)    foundation purposes
(b)    locking devices    

(c)    absorbing shock and vibrations
(d)    transmission of power
(e)    lifting and transportation of machines and cubicles.
Ans: e

80.    Elastic nut is a locking device in which
(a)    one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
(b)    a slot is cut partly in middle of nut and then slot reduced by tightening a screw
(c)    har4 fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is srewed on the bolt causing a tight grip
(d)    through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end
(e)    none of the above,
Ans: c

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