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Machine Design

Machine Design
The material generally used for aircraft components is

High speed steel
Mild steel
Aluminium
Stainless steel

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Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Finer
Coarser
Same
Very fine

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Machine Design
The maximum shear stress theory is used for

Nonferrous materials
Ductile materials
Plastic materials
Brittle materials

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

2 d
2.5 d
1.5 d
d

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Machine Design
Rankine's theory is used for

Brittle materials
Plastic materials
Ductile materials
Elastic materials

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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

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

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