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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Nickel and chromium
Chromium
Nickel
Cobalt and molybdenum

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Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

More or less depending on quantum of load
Less
More
Same

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
4 τ
τ
τ/2

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Machine Design
The piston pin bearings in heavy duty diesel engines are

Spherical roller bearings
Tapered roller bearings
Cylindrical roller bearings
Needle roller bearings

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Machine Design
A riveted joint is a __________ fastening.

Permanent
None of these
Temporary
Either A or B

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Machine Design
The maximum efficiency of a square threaded screw is

(1 - sinφ)/ (1 + cosφ)
(1 - sinφ)/ (1 + sinφ)
(1 + sinφ)/ (1 - sinφ)
(1 + cosφ)/ (1 - sinφ)

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