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Machine Design

Machine Design
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

44045
44047
43869
43929

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Machine Design
The shock absorbing capacity of a bolt may be increased by

Increasing its shank diameter
Decreasing its shank diameter
Making the shank diameter equal to core diameter of thread
Tightening the bolt properly

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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
2 τ
τ
τ/2

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Machine Design
In designing a connecting rod, it is considered like __________ for buckling about Y-axis.

One end fixed and the other end hinged
Both ends fixed
One end fixed and the other end free
Both ends hinged

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

24 kN/m
12 kN/m
30 kN/m
6 kN/m

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Machine Design
Screws used for power transmission should have

Low efficiency
Strong teeth
Very fine threads
High efficiency

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