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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

0.35
0.5
0.2
0.65

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Machine Design
A steel containing 0.8% carbon is known as

None of these
Hypereutectoid steel
Eutectoid steel
Hypo-eutectoid steel

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Machine Design
Antifriction bearings are

Sleeve bearings
None of these
Thin lubricated bearings
Hydrodynamic bearings

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Machine Design
When a bolt is subjected to an external load, the stress induced in the bolt will be

Combined tensile and shear stress
Any one of these
Shear stress
Tensile stress

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Machine Design
The distribution of the forces along the length of key fitted in a shaft

Is uniform throughout
Varies exponentially, being less near the torque-input end
Varies linearly
Varies exponentially, being more near the torque-input end

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2100 N-m
2000 N-m
2050 N-m
2136 N-m

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