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MACHINE DESIGN

Machine Design
The fatigue life of a part can be improved by

Shot peening
Electroplating
Polishing
Coating

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

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Machine Design
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

7 N-m
5 N-m
10 N-m
15 N-m

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Machine Design
A steel containing up to 0.15% carbon is known as

Dead mild steel
Mild steel
High carbon steel
Medium carbon steel

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Machine Design
A steel containing 0.8% carbon is known as

Hypo-eutectoid steel
Eutectoid steel
Hypereutectoid steel
None of these

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