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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Cast iron
Brass
Mild steel
Aluminium

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Machine Design
In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called

Normal pitch
Module
Diametral pitch
Axial pitch

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Machine Design
The contact ratio for gears is

Zero
Greater than one
None of these
Less than one

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Machine Design
In order to withstand resistance to wear, the best profile of gear is

20° full depth involute tooth
20° involute stub tooth
14½° full depth involute tooth
14½° stub tooth

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Machine Design
The square threads are usually found on

Screw cutting lathes
Feed mechanism of machine tools
Spindles of bench vices
Railway carriage couplings

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

None of these
Shaft A is better than shaft B
Shaft B is better than shaft A
Both the shafts are equally good

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