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Machine Design

Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

7 mm
6 mm
4 mm
5 mm

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

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

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Machine Design
A feather key is generally

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

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Machine Design
All stresses produced in a belt are

Shear stresses
Tensile stresses
Compressive stresses
Both tensile and compressive stresses

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

7.2 N/mm² compression
3.6 N/mm² compression
7.2 N/mm² tension
3.6 N/mm² tension

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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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