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Machine Design

Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

0.1 micron
0.01 micron
10 microns
1 micron

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

2 d
2.5 d
1.2 d
1.6 d

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Machine Design
The contact ratio for gears is

Zero
None of these
Greater than one
Less than one

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

(P1 - mv²)/ (P2 - mv²) = eᶠα
P1 / P2 = eᶠα
P1 / P2 = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα

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

8
10
4
6

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Machine Design
Aircraft body is usually fabricated by

Pre-casting
Casting
Riveting
Welding

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