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Machine Design

Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

2W/A
W/A
3W/A
W/2A

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Extremely hazardous
Best method
Cheapest method
Has no effect as regards fatigue strength

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Machine Design
Which one of the following is a positive drive?

Rope drive
V-belt drive
Crossed flat belt drive
Chain drive

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Machine Design
According to I.B.R., the factor of safety of riveted joint should not be less than

2
1
3
4

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Machine Design
Buttress threads are usually found on

Spindles of bench vices
Feed mechanisms
Screw cutting lathes
Railway carriage couplings

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

Electroplating
Shot-peening
Finishing and polishing
De-carburisation

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