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Machine Design

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

Plastic
Elastic
Brittle
Ductile

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Machine Design
In the assembly of pulley, key and shaft

Key is made the weakest
Key is made the strongest
All the three are designed for equal strength
Pulley is made the weakest

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Machine Design
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

Module
Axial pitch
Diametral pitch
Normal pitch

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Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

0.5 to 1
3 to 5
1 to 2
5 to 10

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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

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

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Machine Design
The ball bearings are, usually, made from

High carbon steel
High speed steel
Low carbon steel
Medium carbon steel

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