A Best Way To Crack Gorenment Job Exams

Mechanical Engineering Objective Questions { Machine Design }

71. 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.Hard 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
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72. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation
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73. If threads on a bolt are left hand, threads on nut will be
A.Right hand with same pitch
B.Left hand with same pitch
C.Could be left or right hand
D.Right hand with fine pitch
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74. Taper usually provided on cotter is
A.1 in 5
B.1 in 10
C.1 in 24
D.1 in 40
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75. Applications in which stresses are encountered in one direction only uses following type of threads
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76. The draw of cotter need not exceed
A.3 mm
B.5 mm
C.10 mm
D.20 mm
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77. A bench vice has following type of threads
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