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Machine Design

Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

1 micron
10 microns
0.1 micron
0.01 micron

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is greater than crushing strength
Shear strength is equal to crushing strength
None of these
Shear strength is less than crushing strength

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

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Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.4
0.33
0.55
0.5

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Hot working
Cold working
Shot peening
Grinding and lapping surface

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

0.75/ (0.75 + √v)
4.5/ (4.5 + v)
3/ (3 + v)
6/ (6 + v)

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