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Machine Design

Machine Design
Crushing resistance required to crush the rivet per pitch length is

(p - d) t.σc
p.d.σc
p.t.σc
n.d.t.σc

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Machine Design
The bearings of medium series have capacity __________ over the light series.

30 to 40%
20 to 30%
40 to 50%
10 to 20%

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Machine Design
Which process will increase the fatigue duration of parts?

Shot-peening
Electroplating
Finishing and polishing
De-carburisation

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Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M6
M6 - 8d
M8
M8 - 6d

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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
τ/2
τ
2 τ

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Machine Design
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

Partially
Fully
Either A or B
None of these

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