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Machine Design

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

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

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Machine Design
The notch angle of the Izod impact test specimen is

45°
20°
30°
10°

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Small overall dimensions
All of these
Low starting and low running friction except at very high speeds
Accuracy of shaft alignment

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

4 τ
2 τ
τ
τ/2

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Machine Design
Oldham coupling is used to connect two shafts

Whose axes intersect at a small angle
Which are perfectly aligned
Which have lateral misalignment
Which are not in exact alignment

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Machine Design
A key way lowers

The ductility of the shaft
The strength of the shaft
The rigidity of the shaft
Both the strength and rigidity of the shaft

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