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MACHINE DESIGN

Machine Design
The shock resistance of steel is increased by adding

Nickel
Cobalt and molybdenum
Nickel and chromium
Chromium

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Machine Design
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

Both the ends hinged
One end fixed and the other end hinged
Both the ends fixed
One end fixed and the other end free

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

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

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

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

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Machine Design
The value of stress concentration factor depends upon

None of these
Material and geometry of the part
Material of the part
Geometry of the part

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