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Machine Design

Machine Design
Rankine's theory is used for

Ductile materials
Elastic materials
Plastic materials
Brittle materials

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Machine Design
The ball bearings are, usually, made from

High speed steel
Medium carbon steel
High carbon steel
Low carbon steel

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

All of these
Increasing the length of bar
Decreasing the cross-sectional area of the bar
Decreasing the modulus of elasticity of the bar

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

Equal to 50%
None of these
More than 50%
Less than 50%

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

εc + εl²
εc² + εl
εc + 2εl
2εc + εl

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Machine Design
For maximum power, the velocity of the belt will be

None of these
√(T/m)
√(T/3m)
√(T/2m)

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