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Machine Design

Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Same
Less
More
None of these

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Machine Design
Oil in journal bearing should be applied at the point where load is

Nil or lightest
Any one of the above
Average
Maximum

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Machine Design
The surface finish factor for a mirror polished material is

0.85
1
0.45
0.65

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Machine Design
Stress concentration in cyclic loading is more serious in

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

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Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially downwards
Axially upwards or downwards
None of these
Axially upwards

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Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

2
16
8
4

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