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Machine Design

Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

2.5 d
1.6 d
1.2 d
2 d

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Machine Design
Maximum principal stress theory is applicable for

All of these
Brittle materials
Ductile materials
Elastic materials

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Machine Design
In order to obtain bolt of uniform strength

Increase shank diameter
Tighten die bolt properly
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Increase its length

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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)
Increase with increase in y
Decrease with decrease in y
Depend on other considerations

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Machine Design
When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

Angular bevel gears
Miter gears
Crown bevel gears
Internal bevel gears

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Machine Design
The surface finish factor for a mirror polished material is

0.45
0.65
1
0.85

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