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Machine Design

Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Very fine
Coarser
Same
Finer

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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)

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

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Remain unaffected with cross-section area
Decreasing the cross-section area of bar
Increasing the cross-section area of bar
Would depend upon other factors

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Machine Design
The process extensively used for making bolts and nuts is

Cold peening
Hot piercing
Extrusion
Cold heading

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Machine Design
A backing ring is used inside the pipe joint when making a

Fillet weld
Butt weld
Socket weld
Sleeve weld

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Machine Design
Stress concentration factor is defined as the ratio of

Maximum stress to the nominal stress
Nominal stress to the maximum stress
Nominal stress to the endurance limit
Maximum stress to the endurance limit

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