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Machine Design

Machine Design
Ball bearing type screws are found in following application

Screw jack
Crane
Aeroplane engines
Steering mechanism

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Machine Design
For circumferential joint in boilers, the type of joint used is

Butt joint with double cover plate
Lap joint with one ring overlapping the other
Butt joint with single cover plate
Any one of the above

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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
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the

Carbon content is 2%
Maximum shear strength is 200 N/mm²
Maximum compressive strength is 200 N/mm²
Minimum tensile strength is 200 N/mm²

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Machine Design
The crest diameter of a screw thread is same as

Minor diameter
Major diameter
Core diameter
Pitch diameter

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

0.01 micron
10 microns
0.1 micron
1 micron

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