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Machine Design - Interview Questions and Answers

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31. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by
A. ZN/p
B. p/ZN
C. Z/pN
D. N/Zp
E. Zp/N.
Explanation:
32. 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.
Explanation:
33. 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.
Explanation:
34. 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.
Explanation:
35. The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be
A. same in both cases
B. 2 times more
C. 3 times more
D. 4 times more
E. unpredictable.
Explanation:
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