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Machine Design

Machine Design
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

None of these
Lighter
Moderate
Heavier

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

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Machine Design
Guest's theory is used for

Brittle materials
Ductile materials
Plastic materials
Elastic materials

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Machine Design
The permissible stress for carbon steel under static loading is generally taken as

4000-4500 kg/cm²
3000-4000 kg/cm²
7500-10,000 kg/cm²
2000-3000 kg/m²

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Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Helix angle
Pitch lead angle
Pressure angle
None of these

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Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.2
0.65
0.35
0.5

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