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Machine Design

Machine Design
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

0.8 d
1.2 d
d
0.5 d

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Machine Design
A key way lowers

The rigidity of the shaft
Both the strength and rigidity of the shaft
The ductility of the shaft
The strength of the shaft

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

None of these
0.40 to 0.60%
0.35 to 0.45%
0.20 to 0.40%

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Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Knuckle joint
Universal joint
Cotter joint
Bolted joint

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3
2.5
2.8
3.5

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

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