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Machine Design

Machine Design
In the levers of third type, the mechanical advantage is __________ one.

More than
Less than
Equal to
None of these

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Machine Design
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

0.8 d
0.5 d
d
1.2 d

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is greater than crushing strength
Shear strength is equal to crushing strength
Shear strength is less than crushing strength
None of these

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

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Machine Design
The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to

2 T
1 T
4 T
T/2

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