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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Square
Buttress
NPT (national pipe threads).
Metric

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Machine Design
The modulus of elasticity for mild steel is approximately equal to

100 kN/mm²
110 kN/mm²
80 kN/mm²
210 kN/mm²

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Machine Design
A feather key is generally

Tight in shaft and loose in hub
Tight in both shaft and hub
Loose in both shaft and hub
Loose in shaft and tight in hub

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

1.5 d
2 d
2.5 d
d

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Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Ensure uniform loading
Reduce slip
Ensure proper alignment
Reduce vibration

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Machine Design
Yield point in fatigue loading as compared to static loading is

Depends on other factors
Higher
Same
Lower

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