Exercise: Machine Design

Questions for: Machine Design

The maximum shear stress theory is used for
A:
brittle materials
B:
ductile materials
C:
plastic materials
D:
non-ferrous materials
Answer: B
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A screw will be self locking, if
A:
friction angle is less than helix angle
B:
friction angle is more than helix angle
C:
friction angle is equal to helix angle
D:
efficiency of screw is 100%
Answer: B
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The expression 0.175 - 0.841/T is the Lewis form factor for
A:
composite and full depth involute system
B:
20° full depth involute system
C:
20° stub system
D:
none of the above
Answer: C
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The longitudinal stress is __________ of the circumferential stress.
A:
one-half
B:
two-third
C:
three-fourth
D:
double
Answer: A
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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
A:
2.5
B:
2.8
C:
3.0
D:
3.5
Answer: B
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