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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.2
0.35
0.5
0.65

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Machine Design
Ball bearing type screws are found in following application

Steering mechanism
Aeroplane engines
Crane
Screw jack

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

90° - φ
45° + φ/2
45° - φ/2
45° - φ

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

0.35 to 0.45%
0.20 to 0.40%
0.40 to 0.60%
None of these

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Machine Design
The design of shafts made of brittle materials is based on

St Venant's theory
Rankine's theory
Guest's theory
Von Mises theory

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Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially downwards
Axially upwards or downwards
Axially upwards
None of these

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