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Machine Design

Machine Design
The product of the diametral pitch and circular pitch is equal to

1/π
π
π × number of teeth
1

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Machine Design
Surface endurance limit of gear material is dependent upon its

Toughness
Yield strength
Brinell hardness number
Elastic strength

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

3/ (3 + v)
0.75/ (0.75 + √v)
6/ (6 + v)
4.5/ (4.5 + v)

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Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

Double
One-fourth
One-half
One-eighth

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Machine Design
In a butt welded joint, the size of weld is __________ the throat of weld.

0.5 times
Equal to
2 times
Double

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Machine Design
Resistance to fatigue of a material is measured by

Coefficient of elasticity
Elastic limit
Endurance limit
Young's modulus

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