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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)

d
0.5 d
1.25 d
0.75 d

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Machine Design
The piston pin bearings in heavy duty diesel engines are

Tapered roller bearings
Spherical roller bearings
Needle roller bearings
Cylindrical roller bearings

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Machine Design
The included angle for the British standard whitworth thread is

55°
47.5°
60°
29°

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Machine Design
The permissible stress for carbon steel under static loading is generally taken as

7500-10,000 kg/cm²
3000-4000 kg/cm²
2000-3000 kg/m²
4000-4500 kg/cm²

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Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.55
0.65
0.75
0.45

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Machine Design
The coefficient of friction in belt drive depends upon

Material of belt
Material of pulley
Belt velocity
Materials of belt and pulley

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