Building Construction
The type of joint commonly used at the junction of a principal rafter and tie beam in timber trusses is

Oblique mortise and tenon joint
Mitred joint
Butt joint
Mortise and tenon joint

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

A flap valve at the bottom of tube is provided to extract the soil sample
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

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