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Machine Design

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

67.5°
90°
45°
22.5°

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Machine Design
A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is

None of these
Less than 1/10
Equal to 1/10
Greater than 1/10

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Machine Design
Fabric belts are used in industrial applications because

None of these
They can work at high temperature
They are cheap
They are unaffected by moisture and humidity

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Machine Design
A universal coupling is used to connect two shafts

Which are perfectly aligned
Which are not in exact alignment
Whose axes intersect at a small angle
Have lateral misalignment

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

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

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Machine Design
The stress induced in the belt is,

Direct shear stress
Compressive stress
Torsional shear stress
Tensile stress

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