Concrete Technology and Design of Concrete Structures
In prestressed concrete

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

ANSWER DOWNLOAD EXAMIANS APP

Concrete Technology and Design of Concrete Structures
If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

depends on both crst and acbc
depends on aCbC only
depends on as, only
is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.

ANSWER DOWNLOAD EXAMIANS APP