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Machine Design

Machine Design
The bearings of heavy series have capacity __________ over the medium series.

40 to 50%
20 to 30%
30 to 40%
10 to 20%

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Machine Design
The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is

10.6 kN
22.5 kN
7.5 kN
15 kN

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

σ + √(σ² × 4τ²)
(1/2) × √(σ² × 4τ²)
√(σ² × 4τ²)
(1/2) × [σ + √(σ² × 4τ²)]

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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
Gd⁴/ 8D²n
Gd⁴/ 4D3n
Gd3/ 8D3n

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Machine Design
For longitudinal joint in boilers, the type of joint used is

Butt joint with double cover plate
Any one of the above
Lap joint with one ring overlapping the other
Butt joint with single cover plate

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Machine Design
In case of pressure vessels having open ends, the fluid pressure induces

Circumferential stress
Shear stress
Longitudinal stress
None of these

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