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Machine Design

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

Outside diameter
Height
Pitch diameter
Inside diameter

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Both the shafts are equally good
Shaft A is better than shaft B
Shaft B is better than shaft A
None of these

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Machine Design
The objective of 'crowning' of the flat pulleys of belt drive is to

Prevent the belt joint from damaging the belt surface
Prevent the belt from running off the pulley
Increase the belt velocity
Increase the power transmission capacity

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Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

2 d
4 d
5 d
3 d

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

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

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Machine Design
A locking device extensively used in marine type connecting rod ends is a

Sawn nut
Jam nut
Castle nut
Ring nut

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