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Machine Design

Machine Design
In Vickers hardness testing, the pyramid indentor apex is

40°
122°
152°
136°

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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)

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

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l
l/2
2 l
l/√2

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

2.5 d
1.5 d
2 d
d

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Machine Design
The difference between the upper limit and lower limit of a dimension is called

Tolerance
Nominal size
Actual size
Basic size

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Machine Design
A V-belt designated as B 4430 LP has

4430 mm as diameter of small pulley
4430 mm as diameter of large pulley
4430 mm as nominal pitch length
4430 mm as centre distance between pulleys

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