CONCRETE TECHNOLOGY AND DESIGN OF CONCRETE STRUCTURES QUIZ

Poisson’s ratio for concrete

None of these

decreases with richer mixes

remains constant

increases with richer mixes

TRUE ANSWER : ?
YOUR ANSWER : ?

If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.40 d

0.45 d

dependent on grade of concrete also

0.35 d

TRUE ANSWER : ?
YOUR ANSWER : ?

If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are

1.5 m and 3.0 m

3.0 m and 1.5 m

1.5 m and 1.5 m

3.0 m and 3.0 m

TRUE ANSWER : ?
YOUR ANSWER : ?

Ultimate strength of cold drawn high steel wires

decreases with increase in diameter of bar

increases with increase in diameter of bar

None of these

does not depend on diameter of bar

TRUE ANSWER : ?
YOUR ANSWER : ?

Select the incorrect statement...

None of these

The loss of prestress is more in pre-tensioning system than in post-tensioning system.

Pretensioning system has greater certainty about its durability.

For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system

TRUE ANSWER : ?
YOUR ANSWER : ?

Workability of concrete is directly proportional to

Aggregate cement ratio

Grading of the aggregate

All of above

Time of transit

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

creep of concrete

loss due to friction

elastic shortening of concrete

shrinkage of concrete

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum percentage reinforcement in case of slabs is limited to

9

8

4

2

TRUE ANSWER : ?
YOUR ANSWER : ?

The effect of adding calcium chloride in concrete is i) to increase shrinkage ii) to decrease shrinkage iii) to increase setting time iv) to decrease setting time The correct answer is

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

(i)and(iv)

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

wR / 4d

wR/d

wR/2d

2wR/d

TRUE ANSWER : ?
YOUR ANSWER : ?