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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

3 d
4 d
2 d
5 d

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

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/9
8W/9
2W/3
W/2

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Machine Design
The taper on cotter varies from

1 in 48 to 1 in 24
1 in 32 to 1 in 24
1 in 15 to 1 in 10
1 in 24 to 1 in 20

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

1420 d
2080 d
2840 d
1680 d

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Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

90°
22.5°
45°
67.5°

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