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Machine Design

Machine Design
The included angle in unified of American National threads is

47°
55°
60°
29°

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Machine Design
In second type of levers,

Effort is in between the fulcrum and load
None of these
Fulcrum is in between the load and effort
Load is in between the fulcrum and effort

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Machine Design
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have

Left hand threads
Right hand threads
Pointed threads
Multiple threads

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kt - 1)/ (Kf - 1)
(Kf + 1)/ (Kt + 1)
(Kt + 1)/ (Kf + 1)
(Kf - 1)/ (Kt - 1)

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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)

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

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Machine Design
The modulus of elasticity for mild steel is approximately equal to

80 kN/mm²
110 kN/mm²
100 kN/mm²
210 kN/mm²

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