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Machine Design

Machine Design
Belt slip may occur due to

Loose belt
Heavy load
Driving pulley too small
All of these

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

l/2
l/√2
l
2 l

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Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/4
d/6
d/2
d/8

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

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Machine Design
Deep groove ball bearings are used for

Heavy thrust load only
Radial load at high speed
Small angular displacement of shafts
Combined thrust and radial loads at high speed

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Machine Design
Antifriction bearings are

Thin lubricated bearings
None of these
Hydrodynamic bearings
Sleeve bearings

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