Building Construction
Rotary drilling

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

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Building Construction
Which one of the following activities is not correct as applicable to brick corbels

The maximum projection of each corbel course should be limited to a quarter brick at a time
The maximum projection of the corbel should not be more than the thickness of the wall
Stretcher bond is generally used for the construction of brick corbel
The discontinuous corbels are used to carry heavy concentrated loads

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