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Machine Design

Machine Design
The number of slots in a 25 mm castle nut is

8
6
2
4

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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
τ/2
4 τ
τ

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

0.8 d
1.57 d
1.2 d
1.8 d

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Machine Design
Cast iron pipes are mainly used

In pressure lubrication systems on prime movers
In water and sewage systems
For conveying steam
All of these

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Machine Design
The function of cutting oil when threading a pipe is to

Help removes chips
All of these
Provide cooling action
Lubricate the dies

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Machine Design
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

0.5
0.25
0.2
0.6

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