Building Construction
The function of king post in a king post roof truss is

To receive the ends of principal rafter
To support the frame work of the roof
To prevent the walls from spreading outward
To prevent the tie beam from sagging at its centre

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Building Construction
In the method of tube boring of soil investigation, the following is essential:

A tube of about 2 meters length and 20 cm diameter with a cutting edge
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
All listed here
A flap valve at the bottom of tube is provided to extract the soil sample

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