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Machine Design

Machine Design
In a flange coupling, the bolts are subjected to

Tensile stress
None of these
Compressive stress
Shear stress

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd⁴/ 4D3n
Gd⁴/ 8D²n
Gd3/ 8D3n
Gd⁴/ 8D3n

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

ZN/p
p/ZN
N/Zp
Z/pN

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

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Machine Design
The smallest diameter of an external or internal screw thread is known as

Major diameter
None of these
Pitch diameter
Minor diameter

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Machine Design
In a transverse fillet welded joint, the size of weld is __________ the throat of weld.

Double
0.5 times
2 times
Equal to

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