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WorksheetsAE17403 Unit 3 Friction in threads
Total questions: 12
Worksheet time: 11mins
Nut forms a fixed part and screw on rotating advances is an example of
Lathe screw
Nut and bolt
Screw jack
None of the above
Maximum efficiency is considered only for raising the load
True
False
In the screw jack, the load is raised or lowered using the Application of human effort on
(a)
When coefficient of friction between screw and nut is given we can find directly
Friction angle
Helix angle
When friction between screw and nut as well as friction between bearing surface is given out of these which one should be considered to determine friction angle ?
Friction between nut and screw
Friction between bearing surfaces
Both
If screw thread diameter is 50 mm and pitch is 12 mm, then helix angle in degree is
5.37
2.37
3.37
4.37
If friction angle is greater than helix angle then the screw condition is
(a)
Which of following screw condition is undesirable
Self locking
Over hauling
Both
Efficiency of self locking screw is always less than what percentage
(a)
If friction angle is 2 and helix angle is 3.Determine screw jack efficiency
(a)
To determine total torque which parameter is additionally included in normal torque formula
Friction between bearing surface
Friction between screw and nut
If pitch is 10 mm and then load is lifted to 200 cm, then no. Of turns required to lift the load is
(a)
