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Machine Design

Machine Design
The material generally used for aircraft components is

Mild steel
Stainless steel
High speed steel
Aluminium

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Machine Design
The coefficient of friction between the belt and pulley depends upon the

All of these
Material of belt and pulley
Slip of belt
Speed of belt

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Machine Design
Multiple threads are used to secure

High load lifting capacity
Low efficiency
High efficiency
High mechanical advantage

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3.0
2.5
3.5
2.8

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Machine Design
A flange coupling is used to connect two shafts

Which are perfectly aligned
Have lateral misalignment
Whose axes intersect at a small angle
Which are not in exact alignment

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Machine Design
A screw is said to be over hauling screw, if its efficiency is

Equal to 50%
More than 50%
None of these
Less than 50%

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