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Machine Design

Machine Design
The most important dimension in the design of a nut is

Outside diameter
Height
Inside diameter
Pitch diameter

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Machine Design
The material commonly used for crane hooks is

Wrought iron
Aluminium
Mild steel
Cast iron

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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

2 τ
4 τ
τ
τ/2

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Machine Design
The wear load should be __________ the dynamic load.

Less than
Greater than
Equal to
None of these

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Machine Design
The power transmitted by belt drive depends upon

Initial belt tension
Arc of contact
All of these
Belt velocity

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Machine Design
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

d + 17 mm
2d + 13 mm
3.5d
2d + 20 mm

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