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Machine Design - Interview Questions and Answers

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126. 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
A. 102 d
B. 124 d
C. 138 d
D. 151 d
E. 168 d.
Explanation:
127. The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is
A. larger
B. smaller
C. equal
D. larger/smaller depending on diameter of spring coil
E. unpredictable.
Explanation:
128. Applications in which stresses are encountered in one direction only uses following type of threads
A. metric
B. buttress
C. acme
D. square
E. BSW.
Explanation:
129. 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
E. left hand with fine pitch.
Explanation:
130. Which of the following pipe joints would be suitable for pipes carrying steam
A. flanged
B. threaded
C. bell and spigot
D. expansion
E. compression.
Explanation:
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