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Machine Design

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

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

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Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Same
Less
None of these
More

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Machine Design
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

Normal pitch
Module
Diametral pitch
Axial pitch

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd3/ 8D3n
Gd⁴/ 8D3n
Gd⁴/ 8D²n
Gd⁴/ 4D3n

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Machine Design
The power transmitted by the belt drive can be increased by

Dressing the belt to increase the coefficient of friction
Increasing the initial tension in the belt
All of these
Increasing wrap angle by using idler pulley

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Machine Design
Which of the following pipe joints would be suitable for pipes carrying steam?

Bell and spigot
Flanged
Expansion
Threaded

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