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Machine Design

Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

25
15
21
17

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Machine Design
Factor of safety for fatigue loading is the ratio of

Young's modulus to the ultimate tensile strength
Elastic limit to the working stress
Endurance limit to the working stress
Elastic limit to the yield point

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Machine Design
The material commonly used for machine tool bodies is

Aluminium
Cast iron
Brass
Mild steel

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

29°
60°
55°
47.5°

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Machine Design
In leaf springs, the longest leaf is known as

Upper leaf
Master leaf
Lower leaf
None of these

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Machine Design
The process extensively used for making bolts and nuts is

Cold peening
Hot piercing
Extrusion
Cold heading

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