CONCRETE TECHNOLOGY AND DESIGN OF CONCRETE STRUCTURES QUIZ

For the design of retaining walls, the minimum factor of safety against overturning is taken as

1.5

2

2.5

3

TRUE ANSWER : ?
YOUR ANSWER : ?

Examine the following statements :i) Factor of safety for steel should be based on its yield stress,ii) Factor of safety for steel should be based on its ultimate stress,iii) Factor of safety for concrete should be based on its yield stress,iv) Factor of safety for concrete should be based on its ultimate stress.The correct statements are

(ii) and (iv)

(i) and (iii)

(i) and (iv)

(ii) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

1% of voids in a concrete mix would reduce its strength by about

15%

20%

5%

10 %

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YOUR ANSWER : ?

Assertion A : The load factor for live load is greater than that for dead load.Reason R : The live loads are more uncertain than dead loads.Select your answer based on the coding system given below :

Both A and R are true and R is the correct explanation of A.

A is false but R is true.

A is true but R is false.

Both A and R are true but R is not the correct explanation of A.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

(i) and (ii)

TRUE ANSWER : ?
YOUR ANSWER : ?

The fineness modulus of fine aggregate is in the range of

6.0 to 8.5

5.0 to 7.0

3.5 to 5.0

2.0 to 3.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Sinking of an intermediate support of a continuous beam<br/>i) reduces the negative moment at support<br/>ii) increases the negative moment at support<br/>iii) reduces the positive moment at center of span<br/>iv) increases the positive moment at center of span<br/>The correct answer is

(ii) and (iv)

(i) and (iv)

(ii) and (iii)

(i) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on

None of these

inner face only

front face only

both front face and inner face

TRUE ANSWER : ?
YOUR ANSWER : ?

Shrinkage of concrete depends upon i) humidity of atmosphere ii) passage of time iii) stress The correct answer is

(ii) and (iii)

All (i), (ii) and (iii)

(i) and (ii)

only (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

Bulking of sand is maximum if moisture content is about

4%

6%

5%

7%

TRUE ANSWER : ?
YOUR ANSWER : ?

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