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Machine Design

Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Acme
Buttress
Metric
Square

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

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

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Machine Design
For circumferential joint in boilers, the type of joint used is

Any one of the above
Butt joint with double cover plate
Butt joint with single cover plate
Lap joint with one ring overlapping the other

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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
4 τ
2 τ
τ

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Machine Design
Belt slip may occur due to

All of these
Loose belt
Heavy load
Driving pulley too small

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Decreasing the cross-section area of bar
Remain unaffected with cross-section area
Would depend upon other factors
Increasing the cross-section area of bar

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