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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

12
20
8
18

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

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

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Machine Design
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

Mitre gears
Angular bevel gears
Crown Bevel gears
Internal bevel gears

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Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

5 mm
7 mm
6 mm
4 mm

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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

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

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Machine Design
The material generally used for aircraft components is

Stainless steel
Mild steel
High speed steel
Aluminium

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