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Machine Design

Machine Design
The suitable material for belt used in flour mill is

Leather
Rubber
Canvas or cotton duck
Balata gum

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

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

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Machine Design
Guest's theory is used for

Ductile materials
Brittle materials
Elastic materials
Plastic materials

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Machine Design
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

d + 17 mm
2d + 20 mm
3.5d
2d + 13 mm

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Machine Design
For hardening alloy steels and high speed steels, they are heated to

1100 to 1300°C
700 to 900°C
500 to 600°C
1300 to 1500°C

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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 =eμθ
log (T₁/T₂) = μθ
T₁/T₂ = log μθ

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