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Machine Design

Machine Design
The stress in the threaded part of the bolt will be __________ as compared to the shank.

Higher
None of these
Lower
Same

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Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

F
P
F + P
F.P

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Has no effect as regards fatigue strength
Best method
Extremely hazardous
Cheapest method

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Machine Design
Ball bearing type screws are found in following application

Screw jack
Crane
Aeroplane engines
Steering mechanism

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

P1 - P2
[⅟₂ × (P1 + P2)] + Pc
P1 + P2
⅟₂ × (P1 + P2)

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

εc + εl²
εc² + εl
εc + 2εl
2εc + εl

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