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Machine Design

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

None of these
Lower
Same
Higher

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

24 kN/m
6 kN/m
30 kN/m
12 kN/m

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Machine Design
Aircraft body is usually fabricated by

Welding
Riveting
Pre-casting
Casting

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Machine Design
The notch angle of the Izod impact test specimen is

10°
20°
30°
45°

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Machine Design
In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)

2d + 20 mm
d + 17 mm
2d + 13 mm
3.5 d

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

log (T₁/T₂) = μθ
T₁/T₂ = log μθ
T₁/T₂ =eμθ
T₁/T₂ = μθ

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