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Machine Design

Machine Design
The material generally used for aircraft components is

Aluminium
Stainless steel
High speed steel
Mild steel

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Machine Design
A tube has the following advantage over pipe

All of these
Lighter and easier to handle
Greater shock absorption
Smoother inside walls

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Machine Design
Which of the following screw thread is adopted for power transmission in either direction?

Acme threads
Square threads
Multiple threads
Buttress threads

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Machine Design
A sliding bearing which operates without any lubricant present, is called

Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing
Boundary lubricated bearing
Zero film bearing

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Machine Design
In static loading, stress concentration is more serious in

Brittle materials
Elastic materials
Ductile materials
Brittle as well as ductile materials

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Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

168 d
124 d
138 d
151 d

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