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Machine Design

Machine Design
Screws used for power transmission should have

Very fine threads
Strong teeth
High efficiency
Low efficiency

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Machine Design
Stress concentration factor is defined as the ratio of

Maximum stress to the nominal stress
Nominal stress to the endurance limit
Nominal stress to the maximum stress
Maximum stress to the endurance limit

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

Polishing
Coating
Electroplating
Shot peening

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Machine Design
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key depth
Decrease the key length
Increase the key width
Increase the key length

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Machine Design
Which process will increase the fatigue duration of parts?

Shot-peening
De-carburisation
Electroplating
Finishing and polishing

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Machine Design
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

Face width
Clearance
Backlash
Working depth

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