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Machine Design

Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

7 mm
6 mm
4 mm
5 mm

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.12
1.58
1.06
1.26

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Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

10 microns
0.01 micron
0.1 micron
1 micron

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

T₁/T₂ = μθ
T₁/T₂ = log μθ
T₁/T₂ =eμθ
log (T₁/T₂) = μθ

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Machine Design
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

None of these
Increase
Have same value as that of standard specimen
Decrease

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Machine Design
Which of the following is an anti-friction bearing?

Pedestal bearing
Journal bearing
Collar bearing
Needle bearing

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