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Machine Design

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
If threads on a bolt are left hand, threads on nut will be

Right hand with fine pitch
Could be left or right hand
Right hand with same pitch
Left hand with same pitch

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Machine Design
The rated life of a bearing varies

Directly as load
Inversely as cube of load
Inversely as fourth power of load
Inversely as square of load

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Machine Design
The acme threads are usually found on

Railway carriage couplings
Feed mechanism of machine tools
Spindles of bench vices
Screw cutting lathes

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Machine Design
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the

Maximum compressive strength is 200 N/mm²
Minimum tensile strength is 200 N/mm²
Maximum shear strength is 200 N/mm²
Carbon content is 2%

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Machine Design
Oil in journal bearing should be applied at the point where load is

Average
Any one of the above
Maximum
Nil or lightest

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