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Machine Design

Machine Design
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet.

More than
Equal to
None of these
Less than

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Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

0.124 - (0.684/T)
0.175 - (0.841/T)
None of these
0.154 - (0.912/T)

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

(P1 - mv²)/ (P2 - mv²) = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
P1 / P2 = e–ᶠα
P1 / P2 = eᶠα

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Machine Design
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

Buttress
Acme
Square
BSW

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Machine Design
The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

Ease of manufacture
Safety
Reducing stress concentration
Fullering and caulking

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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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