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Machine Design

Machine Design
According to Indian standards, total numbers of fundamental deviations are

10
15
20
25

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

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

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Machine Design
Which of the following cotter joint will be used to connect strap end of a connecting rod?

Sleeve and cotter joint
Spigot and socket cotter joint
Any one of these
Gib and cotter joint

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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
7.2 N/mm² tension
3.6 N/mm² tension

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Machine Design
For applications involving high stresses in one direction only the following type of thread would be best suited

Square thread
Buttress thread
ISO metric thread
Acme thread

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Machine Design
The property of a bearing material which has the ability to accommodate small particles of dust, grit etc. without scoring the material of the journal, is called

Bondability
Embeddability
Fatigue strength
Comformability

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