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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)

d
0.5 d
0.8 d
1.2 d

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

2εc + εl
εc + εl²
εc² + εl
εc + 2εl

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Machine Design
When a metal or alloy is cold worked,

Its hardness and strength increases
It is worked below recrystallization temperature
None of these
Both (A) and (B)

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

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

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Machine Design
A connecting rod should be

Equally strong in buckling about X-axis and Y-axis
Strong in buckling about Y-axis
Any one of the above
Strong in buckling about X-axis

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Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

18
14
24
12

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