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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Rubber
Leather
Cotton duck
Balata gum

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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

2εc + εl
εc² + εl
εc + εl²
εc + 2εl

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Machine Design
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

Hollow saddle key
Soft key
None of these
Hollow key

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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 (according to Barth) will be equal to (Where, Pc is centrifugal tension)

⅟₂× (P1 + P2)
P1 + P2
[⅟₂ × (P1 + P2)] + Pc
[(√P1 + √P2)/2]²

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Machine Design
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

Thin film
None of these
Thick film
Either A or B

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/9
2W/3
8W/9
W/2

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