Concrete Technology and Design of Concrete Structures
The critical section for finding maximum bending moment for footing under masonry wall is located

at a distance equal to effective depth of footing from the edge of the wall
at the edge of the wall
at the middle of the wall
halfway between the middle and edge of the wall

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

both forces of tension and compres-sion as well as lever arm change
both forces of tension and compres-sion as well as lever arm remain unchanged
forces of tension and compressions remain unchanged but lever arm changes with the moment
forces of tension and compression change but lever arm remains unchanged

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Concrete Technology and Design of Concrete Structures
The diameter of ties in a column should be

More than 5 mm and also more than one-fourth of diameter of main bar
More than or equal to 5 mm
More than or equal to one fourth of diameter of main bar
More than 5 mm but less than one-fourth of diameter of main bar

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