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Machine Design

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

1.6 d
2.5 d
2 d
1.2 d

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Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Medium series whose bore is 5 mm
Light series whose bore is 5 mm
Light series whose bore is 25 mm
Medium series whose bore is 25 mm

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Machine Design
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

1
4
43832
2

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Machine Design
A sliding bearing which operates without any lubricant present, is called

Hydrostatic lubricated bearing
Zero film bearing
Hydrodynamic lubricated bearing
Boundary lubricated bearing

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(WD/ πd3) × K
(8WD/ πd3) × K
(4WD/ πd3) × K
(2WD/ πd3) × K

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2080 d
1680 d
1420 d
2840 d

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