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Machine Design

Machine Design
A rivet is specified by

Shank diameter
Type of head
Length of tail
Length of rivet

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

2W/3
W/9
8W/9
W/2

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Machine Design
The algebraic difference between the maximum limit and the basic size is called

Upper deviation
Mean deviation
Actual deviation
Lower deviation

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Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

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

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Machine Design
The fatigue life of a part can be improved by

Coating
Polishing
Electroplating
Shot peening

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

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

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