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Machine Design

Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

0.5 to 1
3 to 5
1 to 2
5 to 10

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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

2 τ
4 τ
τ/2
τ

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Machine Design
The surface finish factor for a mirror polished material is

0.45
0.85
0.65
1

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

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

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

p/ZN
ZN/p
N/Zp
Z/pN

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Machine Design
The static tooth load should be __________ the dynamic load.

Less than
Greater than
Equal to
None of these

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