Latest Machine Design Lab viva Questions and Answers pdf

131.    For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately
(a) 0.4 times
(b) 0.6 times
(c) 0.7 times
(d) 0.8 times
(e) 0.9 times the normal diameter of bolt.
Ans: a

132.    Allen bolts are
(a)    self locking bolts
(b)    designed for shock load
(c)    used in aircraft application
(d)    provided with hexagonal depression in head
(e)    uniform strength bolts.
Ans: d

133.    The resultant axial load on a bolt depends on
(a)    initial tension
(b)    external load applied
(c)    relative elastic yielding (springiness) of the bolt and the connected member
(d)    (a) and (b) above
(e)    (a), (b) and (c) above.
Ans: e

134.    The connecting rod bolts are tightened up so that tightening stress
(a)    is just sufficient to hold parts together
(b)    approaches yield point
(c)    is 50% of yield point
(d)    is about yield point divided by safety factor
(e)    none of the above.
Ans: b

135.    The connecting rod bolts are tightened up with initial tension greater than the external load so that
(a)    joint may not open up
(b)    bolts are weakest elements
(c)    the resultant load on the bolt would not be affected by the external cyclic load
(d)    bolts will not loosen during service
(e)    none of the above.
Ans: c

136.    If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited
(a) square
(b) acme
(c) buttress
(d) BSW
(e) metric.
Ans: c

137.    When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at
(a)    shank
(b)     head
(c)    in the middle
(d)    at the thread
(e)    anywhere in the bolt.
Ans: d

138.    The shock absorbing capacity of a bolt can be increased by
(a)     tightening it properly
(b)    increasing shank diameter
(c)    grinding the shank
(d)    using washer
(e)    making shank diameter equal to core diameter of thread.
Ans: e

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