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Machine Design

Machine Design
A bench vice has following type of threads

Acme
Buttress
Square
Metric

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Machine Design
The cold working of metals is carried out __________ the recrystallization temperature.

None of these
At
Below
Above

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

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

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.5
2.8
3.5
3

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Machine Design
Stress concentration in cyclic loading is more serious in

Depends on other factors
Ductile materials
Equally serious in both cases
Brittle materials

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Decreasing the modulus of elasticity of the bar
Increasing the length of bar
All of these
Decreasing the cross-sectional area of the bar

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