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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Rubber
Balata gum
Cotton duck
Leather

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Machine Design
Fibrous fracture occurs in

Ductile material
Brittle material
Elastic material
Hard material

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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
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

20 times
15 times
5 times
10 times

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ k₂)

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Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Full annealing
Normalising
Process annealing
Spheroidising

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