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Machine Design

Machine Design
The material generally used for aircraft components is

Stainless steel
Mild steel
High speed steel
Aluminium

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

8W/9
W/9
W/2
2W/3

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

Balata gum
Rubber
Canvas or cotton duck
Leather

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2080 d
1680 d
1420 d
2840 d

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Machine Design
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

Increase
Decrease
None of these
Have same value as that of standard specimen

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Machine Design
The washer is generally specified by its

Outer diameter
Mean diameter
Thickness
Hole diameter

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