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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)

5 d
4 d
3 d
2 d

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Machine Design
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key depth
Decrease the key length
Increase the key width
Increase the key length

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

1.8 d
1.2 d
1.57 d
0.8 d

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Be independent of ratio of mass of load W to mass of bar (y)
Decrease with decrease in y
Depend on other considerations
Increase with increase in y

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Machine Design
The design of shafts made of brittle materials is based on

Rankine's theory
Guest's theory
Von Mises theory
St Venant's theory

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Machine Design
The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

Reducing stress concentration
Fullering and caulking
Ease of manufacture
Safety

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