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Machine Design

Machine Design
Aircraft body is usually fabricated by

Casting
Pre-casting
Riveting
Welding

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

√2P/s.l
2P/s.l
P/√2.s.l
P/2.s.l

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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)

5 d
3 d
2 d
4 d

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Machine Design
A universal coupling is used to connect two shafts

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

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Machine Design
The function of the washer is to

Absorb shocks and vibrations
Provide bearing area
Fill up the axial gap
Provide cushioning effect

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Machine Design
The face angle of a bevel gear is equal to

Pitch angle + addendum angle
Pitch angle - dedendum angle
Pitch angle + dedendum angle
Pitch angle - addendum angle

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