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Machine Design

Machine Design
The stress in the threaded part of the bolt will be __________ as compared to the shank.

Same
Lower
None of these
Higher

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

⅟₂× (P1 + P2)
[(√P1 + √P2)/2]²
P1 + P2
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

T/sec³φ
T sec²φ
T sec³φ
T cosecφ

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Machine Design
The pipe joint mostly used for pipes carrying water at low pressures is

Socket joint
Union joint
Spigot and socket joint
Nipple joint

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Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

5 mm
7 mm
6 mm
4 mm

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Machine Design
Residual stress in materials

Acts when external load is applied
Is independent of external loads
Becomes zero when external load is removed
Is always harmful

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