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Machine Design

Machine Design
Ball bearing type screws are found in following application

Aeroplane engines
Screw jack
Crane
Steering mechanism

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Machine Design
Screws used for power transmission should have

Low efficiency
Very fine threads
Strong teeth
High efficiency

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Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Full annealing
Process annealing
Normalising
Spheroidising

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Machine Design
For steel, the ultimate strength in shear as compared to ultimate strength in tension is

43833
43834
43832
43864

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Machine Design
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

Grey colour
Brown colour
White colour
Yellow colour

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Decreases
None of these
Remains unchanged
Increases

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