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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.35
0.2
0.65
0.5

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

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

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Machine Design
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

Hollow saddle key
None of these
Soft key
Hollow key

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Machine Design
Resilience of a material is important, when it is subjected to

Combined loading
Thermal stresses
Shock loading
Fatigue

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Machine Design
In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)

2d + 13 mm
d + 17 mm
3.5 d
2d + 20 mm

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Increases
None of these
Remains unchanged
Decreases

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