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Machine Design

Machine Design
Aircraft body is usually fabricated by

Pre-casting
Welding
Casting
Riveting

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Machine Design
The cam follower extensively used in aircraft engines is

Flat faced follower
Spherical faced follower
Knife edge follower
Roller follower

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

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Machine Design
In order to withstand resistance to wear, the best profile of gear is

14½° full depth involute tooth
14½° stub tooth
20° involute stub tooth
20° full depth involute tooth

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Machine Design
The included angle for the V-belt is usually

60°-80°
10°-20°
30°-40°
40°-60°

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Machine Design
In designing a connecting rod, it is considered like __________ for buckling about X-axis.

Both ends hinged
One end fixed and the other end hinged
One end fixed and the other end free
Both ends fixed

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