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Machine Design

Machine Design
A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

None of these
Equal to
Less than
Greater than

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by Where m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction a = angle of wrap (radians)

(P1 - mv²)/ (P2 - mv²) = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
P1 / P2 = e–ᶠα
P1 / P2 = eᶠα

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Machine Design
The material commonly used for crane hooks is

Aluminium
Mild steel
Cast iron
Wrought iron

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Machine Design
All stresses produced in a belt are

Shear stresses
Compressive stresses
Both tensile and compressive stresses
Tensile stresses

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Machine Design
Guest's theory of failure is applicable for following type of materials

Plastic
Elastic
Ductile
Brittle

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Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

124 d
138 d
168 d
151 d

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