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Mechanical Engineering - Machine Design

Exercise : Machine Design - Section 2
41.
A shaft is subjected to a maximum bending stress of 80 N/mm2 and maximum shearing stress equal to 30 N/mm2 at a particular section. If the yield point in tension of the material is 280 N/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be
2.5
2.8
3.0
3.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
The longitudinal stress is __________ of the circumferential stress.
one-half
two-third
three-fourth
double
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
The expression 0.175 - 0.841/T is the Lewis form factor for
composite and full depth involute system
20° full depth involute system
20° stub system
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
A screw will be self locking, if
friction angle is less than helix angle
friction angle is more than helix angle
friction angle is equal to helix angle
efficiency of screw is 100%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
The maximum shear stress theory is used for
brittle materials
ductile materials
plastic materials
non-ferrous materials
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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