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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

NPT (national pipe threads).
Square
Buttress
Metric

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Machine Design
The resistance to fatigue of a material is measured by

Young's modulus
Ultimate tensile strength
Elastic limit
Endurance limit

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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)

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

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Machine Design
In a steam engine, the valve rod is connected to an eccentric rod by means of

Flange coupling
Cotter joint
Knuckle joint
Universal joint

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Machine Design
Buttress threads are usually found on

Spindles of bench vices
Railway carriage couplings
Screw cutting lathes
Feed mechanisms

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Machine Design
A localized compressive stress at the area of contact between two members is known as

Bending stress
Bearing stress
Tensile stress
Shear stress

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