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Machine Design

Machine Design
The size of a gear is usually specified by

Diametral pitch
Circular pitch
Pressure angle
Pitch circle diameter

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ/2
τ
2 τ
4 τ

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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
In order to withstand resistance to wear, the best profile of gear is

20° full depth involute tooth
14½° stub tooth
20° involute stub tooth
14½° full depth involute tooth

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

25 mm
10 mm
15 mm
5 mm

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Machine Design
A steel containing up to 0.15% carbon is known as

Medium carbon steel
High carbon steel
Dead mild steel
Mild steel

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