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Machine Design

Machine Design
Rankine Gordon formula for buckling is valid for

Short column
Long column
Short and long column
Very long column

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

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Machine Design
When two helical springs of equal lengths are arranged to form a cluster spring, then

Shear stress in each spring will be equal
Both A and B is correct
Only A is correct
Load taken by each spring will be half the total load

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Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

1 micron
0.1 micron
0.01 micron
10 microns

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Machine Design
The bearing characteristic number in a hydrodynamic bearing depends upon

Viscosity, speed and load
Viscosity, speed and bearing pressure
Length, width and load
Length, width and speed

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Machine Design
Residual stress in materials

Is always harmful
Becomes zero when external load is removed
Is independent of external loads
Acts when external load is applied

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