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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.5
0.2
0.35
0.65

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Machine Design
When a metal or alloy is cold worked,

Its hardness and strength increases
Both (A) and (B)
None of these
It is worked below recrystallization temperature

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Machine Design
The resultant axial load on a bolt depends on

Relative elastic yielding (springness) of the bolt and the connected member
All of these
External load applied
Initial tension

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Machine Design
The acme threads are usually found on

Screw cutting lathes
Feed mechanism of machine tools
Railway carriage couplings
Spindles of bench vices

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

(T₁ - T₂ + Tc)/2
T₁ - T₂ + Tc
T₁ + T₂ + Tc
(T₁ + T₂ + Tc)/2

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

T₁/T₂ = μθ
T₁/T₂ =eμθ
T₁/T₂ = log μθ
log (T₁/T₂) = μθ

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