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Machine Design

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

152°
136°
40°
122°

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Decreases markedly
Depends on heat treatment carried out
Remain same
Increases markedly

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Machine Design
The centre distance between two meshing involute gears is equal to

Difference of pitch circle radii/cosφ
Difference of base circle radii/cosφ
Sum of base circle radii/cosφ
Sum of pitch circle radii/cosφ

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Machine Design
A screw will be self locking, if

Efficiency of screw is 100%
Friction angle is more than helix angle
Friction angle is equal to helix angle
Friction angle is less than helix angle

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Machine Design
In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)

2d + 13 mm
3.5 d
2d + 20 mm
d + 17 mm

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

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