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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Aluminium
Mild steel
Cast iron
Brass

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

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

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Machine Design
A localized compressive stress at the area of contact between two members is known as

Bearing stress
Bending stress
Tensile stress
Shear stress

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Machine Design
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Upper surface
Lower surface
None of these
Neutral surface

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2080 d
2840 d
1420 d
1680 d

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Machine Design
The stress in the threaded part of the bolt will be __________ as compared to the shank.

Higher
Lower
Same
None of these

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