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Machine Design

Machine Design
The material generally used for aircraft components is

Mild steel
Aluminium
High speed steel
Stainless steel

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Machine Design
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.

180°
160°
135°
90°

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Machine Design
For circumferential joint in boilers, the type of joint used is

Lap joint with one ring overlapping the other
Any one of the above
Butt joint with single cover plate
Butt joint with double cover plate

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Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Addendum circle diameter × cosφ
Pitch circle diameter × sinφ
Pitch circle diameter × cosφ
Clearance circle diameter × cosφ

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Machine Design
A key way lowers

The rigidity of the shaft
The ductility of the shaft
Both the strength and rigidity of the shaft
The strength of the shaft

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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

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

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