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Machine Design

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

More
None of these
Less
Same

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Machine Design
In a marine flange coupling, the thickness of flange is taken as

d/2
3d/4
d/3
d/4

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

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Machine Design
A universal coupling is used to connect two shafts

Whose axes intersect at a small angle
Which are perfectly aligned
Which are not in exact alignment
Have lateral misalignment

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Has no effect as regards fatigue strength
Extremely hazardous
Cheapest method
Best method

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Machine Design
A steel containing 0.8% carbon is known as

None of these
Eutectoid steel
Hypo-eutectoid steel
Hypereutectoid steel

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