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Machine Design

Machine Design
Screws used for power transmission should have

Strong teeth
Very fine threads
High efficiency
Low efficiency

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd⁴/ 8D²n
Gd⁴/ 4D3n
Gd3/ 8D3n
Gd⁴/ 8D3n

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Machine Design
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

d + 17 mm
3.5d
2d + 20 mm
2d + 13 mm

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Machine Design
Gears are casted by

Permanent mould casting
Centrifugal casting
Sand mould casting
Slush casting

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Machine Design
Allen bolts are

Self locking bolts
Designed for shock load
Provided with hexagonal depression in head
Used in aircraft application

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Machine Design
The number of slots in a 25 mm castle nut is

6
4
2
8

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