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Machine Design

Machine Design
The following type of nut is used with alien bolt

Slotted nut
Castle nut
Hexagonal nut
Any one of the above

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Machine Design
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

Hydrostatic lubricated bearing
Boundary lubricated bearing
Zero film bearing
Hydrodynamic lubricated bearing

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

30 kN/m
24 kN/m
6 kN/m
12 kN/m

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Machine Design
A key way lowers

The rigidity of the shaft
The ductility of the shaft
The strength of the shaft
Both the strength and rigidity of the shaft

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Machine Design
The shock resistance of steel is increased by adding

Nickel
Nickel and chromium
Cobalt and molybdenum
Chromium

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.8
3.5
3
2.5

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