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Machine Design

Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

8
6
4
10

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Machine Design
Which of the following statement is correct for gears?

The pitch circle diameter is equal to the product of module and number of teeth
The addendum is less than dedendum
All of these
The pitch circle is always greater than the base circle

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

2εc + εl
εc + 2εl
εc + εl²
εc² + εl

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

None of these
Shaft A is better than shaft B
Shaft B is better than shaft A
Both the shafts are equally good

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Machine Design
A feather key is generally

Tight in shaft and loose in hub
Loose in both shaft and hub
Loose in shaft and tight in hub
Tight in both shaft and hub

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Machine Design
In most machine members, the damping capacity of the material should be

Zero
Could be anything
Low
High

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