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Machine Design

Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

3 to 5
1 to 2
5 to 10
0.5 to 1

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

2 l
l
l/2
l/√2

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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/ 8D3n
Gd3/ 8D3n
Gd⁴/ 8D²n
Gd⁴/ 4D3n

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Machine Design
The ratio of pitch circle diameter in millimeters to the number of teeth, is called

Diametral pitch
None of these
Module
Circular pitch

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

(T₁ + T₂ + Tc)/2
(T₁ - T₂ + Tc)/2
T₁ + T₂ + Tc
T₁ - T₂ + Tc

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Machine Design
A V-belt designated as B 4430 LP has

4430 mm as diameter of large pulley
4430 mm as diameter of small pulley
4430 mm as centre distance between pulleys
4430 mm as nominal pitch length

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