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Machine Design

Machine Design
The suitable material for belt used in flour mill is

Leather
Rubber
Balata gum
Canvas or cotton duck

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Machine Design
Failure of a material is called fatigue when it fails

At the elastic limit
At the yield point
Below the elastic limit
Below the yield point

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

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Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

90°
67.5°
45°
22.5°

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

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Machine Design
Aircraft body is usually fabricated by

Riveting
Welding
Casting
Pre-casting

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