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Machine Design

Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

4
6
8
10

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Machine Design
In a horizontal flat belt drive, it is customary to use

Bottom side of belt as slack side
Idler pulley
Top side of belt as slack side
None of these

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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
τ/2
2 τ

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.6 times
0.8 times
0.4 times
0.7 times

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

80 to 90%
70 to 83%
63 to 70%
45 to 60%

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Machine Design
Lewis equation is applied

Only to the pinion
To weaker of the pinion or gear
To stronger of the pinion or gear
Only to the gear

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