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Machine Design

Machine Design
Ball bearing type screws are found in following application

Aeroplane engines
Crane
Steering mechanism
Screw jack

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Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

4.5/(4.5 + v)
0.75/(0.75 + √v)
6/(6 + v)
3/(3 + v)

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Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/2
d/8
d/4
d/6

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Machine Design
When a metal or alloy is cold worked,

Its hardness and strength increases
It is worked below recrystallization temperature
Both (A) and (B)
None of these

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Machine Design
The following type of nut is used with alien bolt

Castle nut
Any one of the above
Slotted nut
Hexagonal nut

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Decreasing the cross-sectional area of the bar
Decreasing the modulus of elasticity of the bar
Increasing the length of bar
All of these

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