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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

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

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Machine Design
The ratio of the ultimate stress to the design stress is known as

Strain
Elastic limit
Bulk modulus
Factor of safety

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Decreases markedly
Remain same
Depends on heat treatment carried out
Increases markedly

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Machine Design
According to Indian standards, total numbers of tolerance grades are

8
18
20
12

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Machine Design
The largest diameter of an external or internal screw thread is known as

Pitch diameter
Major diameter
Minor diameter
None of these

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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

Yellow colour
Brown colour
Grey colour
White colour

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