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Machine Design

Machine Design
Rankine's theory is used for

Ductile materials
Elastic materials
Plastic materials
Brittle materials

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Machine Design
The wire ropes make contact at

Sides of groove of the pulley
Sides and bottom of groove of the pulley
Bottom of groove of the pulley
Anywhere in the groove of the pulley

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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/ 8D²n
Gd⁴/ 4D3n
Gd3/ 8D3n
Gd⁴/ 8D3n

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Machine Design
Deep groove ball bearings are used for

Combined thrust and radial loads at high speed
Small angular displacement of shafts
Radial load at high speed
Heavy thrust load only

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Machine Design
The rolling contact bearings are known as

Thick lubricated bearings
Antifriction bearings
Thin lubricated bearings
Plastic bearings

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

3.6 N/mm² tension
7.2 N/mm² compression
3.6 N/mm² compression
7.2 N/mm² tension

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