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Machine Design

Machine Design
If a material fails below its yield point, failure would be due to

Creep
Straining
Fatigue
Sudden loading

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Machine Design
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key width
Increase the key depth
Decrease the key length
Increase the key length

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Machine Design
The permissible stress for carbon steel under static loading is generally taken as

2000-3000 kg/m²
4000-4500 kg/cm²
7500-10,000 kg/cm²
3000-4000 kg/cm²

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Machine Design
The bearings of medium series have capacity __________ over the light series.

30 to 40%
40 to 50%
20 to 30%
10 to 20%

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

5 mm
6 mm
4 mm
7 mm

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/3a)]
σ [1 + (2a/b)]
σ [1 + (3a/b)]
σ [1 + (b/2a)]

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