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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Chromium
Nickel
Cobalt and molybdenum
Nickel and chromium

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Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.55
0.75
0.65
0.45

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Machine Design
A column is known as a long column if the slenderness ratio is

50
70
40
100

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Machine Design
When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

Compression
Tension
Shear
Combined loads

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Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

None of these
Smaller than
Equal to
Larger than

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Machine Design
Ball bearing type screws are found in following application

Crane
Steering mechanism
Screw jack
Aeroplane engines

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