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Machine Design

Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Effective
Largest
None of these
Smallest

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Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Shear
Tension
Compression
All of these

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Decreases markedly
Depends on heat treatment carried out
Increases markedly
Remain same

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Machine Design
Which of the following statement is correct, for two shafts connected in parallel?

Torque in each shaft is the same
Shear stress in each shaft is the same
Angle of twist of each shaft is the same
Torsional stiffness of each shaft is the same

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Machine Design
In order to remove internal stresses produced by hardening the steel, the process usually adopted is

Normalizing
Spheroidizing
Tempering
Annealing

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

W/A
2W/A
3W/A
W/2A

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