8/11/2019 Number 1 Intrebari beton

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Number 1

1. The failure of concrete in compression is produced by cracks:a. Parallel with the force direction;

b. Perpendicular on the force direction;c. Inclined after the neutral axis.

2. The compressive strength is determined at:a. 1 daysb. 28 days

c. !" days#. $ompressive strength of concrete is computed %ith relation:

a. Rc=Pr/Ab

b. &c'P(ac. &c'2Pr()b

. *ailure of concrete in axial tension is produced by:a. tangential stressesb. tensile stresses

c. compressive transversal stresses+. The relation for determining split tensile strength is:

a. Rtd= 2Pr/ DL

b. &td' Pr(, -c. &td' 2Pr(,

/. )t failure in bending the concrete sho%s:a. t%o cracksb. more cracksc. one crack

0. In torsion concrete is subected to:a. tangential stressesb. tensile stresses

c. compressive stresses. 3hrinkage of concrete occurs %hen:

a. concrete hardens in %aterb. concrete hardens in air

c. concrete is protected during hardening

!. The relation for determining the modulus of deformation isa. 4bp' tg5rb. 4bp' tg6c. Eb= t!"

1". The creep of concrete is:a. defor#ation in ti#e $nder constant load;

b. force that produce deformationc. cracking in time

8/11/2019 Number 1 Intrebari beton

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11. The steel for reinforced concrete can be used as:a. resistant and constr$cti%e reinforce#ent

b. independent resistant barsc. constructive mesh

12. 3trands are reali7ed of:

a. + %iresb. & wires

c. ! %ires1#. 8ond bet%een concrete and steel is reali7ed by:

a. !ri' stickin! and friction

b. grip and frictionc. adherence and friction

1. 9orking stages for tensioned members: in second stage the concrete is:a. cracked on the entire sectionb. cracked in the compressed 7onec. artial cracked in the tension (one

1+. The failure of beams is produced by:a. the yielding of reinforcement and displacementb. the yieldin! of reinforce#ent and cr$shin! of co#ressed concrete

c. high displacement in the span and cracks1/. The cracks in the tension 7one of beams are:

a. nor#al and inclined

b. inclinedc. normal and hori7ontal

10. embers that are subected to bending are:a. bea#s and slabs

b. beams and columnsc.

beams and arches1. The relation for fcdis:a. fcd'5fck(cb. fcd'fck(cc. fcd'5fc(c

1!. The doubly reinforced rectangular section has:a. 3teel in compression 7oneb. 3teel in compression 7one and tension 7onec. 3teel in tension 7one

2". The ultimate moment capacity of a singly reinforced rectangular section is:a. caps.r' *c?*s?< x=