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

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

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Building Construction
Auger boring

Is the most primitive method for making a hole in the ground
All of these
Is generally employed in cohesive and other self soils above water table
Is most economical up-to a depth of 5 meters

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Building Construction
Rotary drilling

Is not suitable for deposits containing very coarse gravel
Is not economical for holes of less than 10 cm
Hinders the ground water observations and permeability test
All listed here

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