CONCRETE TECHNOLOGY AND DESIGN OF CONCRETE STRUCTURES QUIZ

When shear stress exceeds the permissible limit in a slab, then it is reduced by

Using thinner bars but more in number

Providing shear reinforcement

Increasing the depth

Using high strength steel

TRUE ANSWER : ?
YOUR ANSWER : ?

Sinking of an intermediate support of a continuous beami) reduces the negative moment at supportii) increases the negative moment at supportiii) reduces the positive moment at center of spaniv) increases the positive moment at center of span The correct answer is

(i) and (iii)

(i) and (iv)

(ii) and (iii)

(ii) and (iv)

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of hand mixing of concrete, the extra cement to be added is

5%

15%

20%

10%

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

3.0 m and 3.0 m

1.5 m and 3.0 m

3.0 m and 1.5 m

1.5 m and 1.5 m

TRUE ANSWER : ?
YOUR ANSWER : ?

In prestressed concrete

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

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 change

TRUE ANSWER : ?
YOUR ANSWER : ?

The average permissible stress in bond for plain bars in tension is

decreased by 25% for bars in compression

decreased by 10% for bars in compression

increased by 10% for bars in compression

increased by 25% for bars in compression

TRUE ANSWER : ?
YOUR ANSWER : ?

The design yield stress of steel according to IS: 456-1978 is (where fy is the characteristic yield strength of steel)

0.37 fy

0.57 fy

0.67 fy

0.87 fy

TRUE ANSWER : ?
YOUR ANSWER : ?

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

5.5

2.5

3.5

4.5

TRUE ANSWER : ?
YOUR ANSWER : ?

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

0.75 - 0.80

Above 0.92

0.75 - 0.80

0.85 - 0.92

TRUE ANSWER : ?
YOUR ANSWER : ?

In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided oni) bottom face near counterfortii) top face near counterfortiii) bottom face near centre of spaniv) top face near centre of span The correct answer is

only (i)

both (i) and (iv)

only (ii)

both (ii) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?