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Machine Design

Machine Design
Belt slip may occur due to

Loose belt
Heavy load
All of these
Driving pulley too small

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Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

17
25
15
21

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

1.875 × (π/4) d² × τ × n
(π/4) d² × τ × n
2 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n

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Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

Less
More or less depending on quantum of load
Same
More

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° + φ/2
45° - φ
90° - φ
45° - φ/2

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/3a)]
σ [1 + (b/2a)]
σ [1 + (2a/b)]
σ [1 + (3a/b)]

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