Exercise: Machine Design

Questions for: Machine Design

An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by
A:
increasing the length of bar
B:
decreasing the cross-sectional area of the bar
C:
decreasing the modulus of elasticity of the bar
D:
all of the above
Answer: D
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All stresses produced in a belt are
A:
compressive stresses
B:
tensile stresses
C:
both tensile and compressive stresses
D:
shear stresses
Answer: B
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In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that
A:
the effect of curvature of the cylinder wall is neglected
B:
the tensile stresses are uniformly distributed over the section of the walls
C:
the effect of the restraining action of the heads at the end of the pressure vessel is neglected
D:
all of the above
Answer: D
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Lewis equation in gears is used to find the
A:
tensile stress in bending
B:
shear stress
C:
compressive stress in bending
D:
fatigue stress
Answer: C
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For crank shaft bearings, the ratio of the length of the journal to its diameter is less than unity.
A:
Correct
B:
Incorrect
C:
D:
Answer: A
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