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Machine Design

Machine Design
Aircraft body is usually fabricated by

Welding
Casting
Riveting
Pre-casting

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Machine Design
A feather key is generally

Tight in both shaft and hub
Loose in shaft and tight in hub
Tight in shaft and loose in hub
Loose in both shaft and hub

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Machine Design
The bearings of medium series have capacity __________ over the light series.

40 to 50%
10 to 20%
20 to 30%
30 to 40%

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Machine Design
The permissible stress for carbon steel under static loading is generally taken as

3000-4000 kg/cm²
2000-3000 kg/m²
4000-4500 kg/cm²
7500-10,000 kg/cm²

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Machine Design
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

Four times
Equal to
Twice
Three times

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Machine Design
The maximum efficiency of a square threaded screw is

(1 - sinφ)/ (1 + sinφ)
(1 + sinφ)/ (1 - sinφ)
(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)

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