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Machine Design

Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Shear
All of these
Tension
Compression

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Machine Design
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.

160°
90°
135°
180°

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Machine Design
In V-belt drive, belt touches

At sides only
At bottom
Both at bottom and sides
Could touch anywhere

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Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

1.2 d
2.5 d
2 d
1.6 d

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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

M8
M6
M8 - 6d
M6 - 8d

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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

τ/2
τ
2 τ
4 τ

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