Concrete Technology and Design of Concrete Structures
In counterfort type retaining walls i) the vertical slab is designed as a continuous slab ii) the heel slab is designed as a continuous slab iii) the vertical slab is designed as a cantilever iv) the heel slab is designed as a cantilever The correct answer is

(i) and (iv)
(i) and (ii)
(ii) and (iii)
(iii) and (iv)

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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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