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Machine Design

Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

0.75 d
0.5 d
d
1.25 d

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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)

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

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Machine Design
The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to

1 T
4 T
T/2
2 T

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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 vibration
Reduce slip
Ensure proper alignment

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Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Metric
Acme
Buttress
Square

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Machine Design
Euler’s formula for a mild steel column is not valid if the slenderness ratio is

120
100
90
60

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