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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Nickel and chromium
Chromium
Cobalt and molybdenum
Nickel

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Machine Design
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

Have same value as that of standard specimen
Decrease
Increase
None of these

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Machine Design
The railway carriage couplings have

Buttress threads
Knuckle threads
Square threads
Acme threads

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

Smallest
Effective
Largest
None of these

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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

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

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Machine Design
The fatigue life of a part can be improved by

Polishing
Coating
Shot peening
Electroplating

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