While designing an air entrained concrete

Question

While designing an air entrained concrete

A. Water cement ratio is reduced

B. Proportion of aggregates is reduced

C. An allowance for the entrained air is made

D. All the above

Share this question with your friends

Show all Concrete Technology and Design MCQ

Comment

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:

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

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

C. A is true but R is false

D. A is false but R is true

Discuss this answer

Allowable shear strength of concrete, depends upon

A. Shear strength

B. Tensile strength

C. Compressive strength

D. None of these

Discuss this answer

Admixtures which cause early setting and hardening of concrete are called

A. Workability admixtures

B. Accelerators

C. Retarders

D. Air entraining agents

Discuss this answer

Pick up the correct statement from the following:

A. Bulking of sand is caused due to formation of a thin film of surface moisture

B. Fine sand bulks more than coarse sand

C. The volume of fully saturated sand, is equal to the volume of dry and loose sand

D. All the above

Discuss this answer

For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:

A. 70 litres of sand and 120 litres of aggregates

B. 70 kg of sand and 140 litres of aggregates

C. 105 litres of sand and 140 litres of aggregates

D. 105 litres of sand and 210 litres of aggregates

Discuss this answer

The minimum cover in a slab should neither be less than the diameter of bar nor less than

A. 10 mm

B. 15 mm

C. 25 mm

D. 13 mm

Discuss this answer

W_p and W_f are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor (W_p/W_f) is 0.95, the workability of concrete is

A. Extremely low

B. Very low

C. Low

D. High

Discuss this answer

Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is

A. 30 %

B. 40 %

C. 50 %

D. 60 %

Discuss this answer

The light weight aggregates are obtained from

A. Sedimentary rocks

B. Metamorphic rocks

C. Igneous rocks

D. Volcanic source

Discuss this answer

Pick up the correct statement from the following:

A. Segregation is necessary for a workable concrete

B. Consistency does not affect the workability of concrete

C. If the concrete mix is dry, the slump is maximum

D. None of these

Discuss this answer

Concrete gains strength due to

A. Chemical reaction of cement with sand and coarse aggregates

B. Evaporation of water from concrete

C. Hydration of cement

D. All the above

Discuss this answer

The strength of concrete after one year as compared to 28 days strength is about

A. 10 to 15% more

B. 15 to 20% more

C. 20 to 25% more

D. 25 to 50% more

Discuss this answer

High carbon content in the steel causes

A. Decrease in tensile strength but increase in ductility

B. Increase in tensile strength but decrease in ductility

C. Decrease in both tensile strength and ductility

D. Increase in both tensile strength and ductility

Discuss this answer

According to IS: 4561978, the column or the strut is the member whose effective length is greater than

A. The least lateral dimension

B. 2 times the least lateral dimension

C. 3 times the least lateral dimension

D. 4 times the least lateral dimension

Discuss this answer

The ratio of the length to breadth of a wooden float, is

A. 4.5

B. 5.5

C. 6.5

D. 7.5

Discuss this answer

Critical section for shear in case of flat slabs is at a distance of

A. Effective depth of slab from periphery of column/drop panel

B. d/2 from periphery of column/capital/ drop panel

C. At the drop panel of slab

D. At the periphery of column

Discuss this answer

Poisson's ratio for concrete

A. Remains constant

B. Increases with richer mixes

C. Decreases with richer mixes

D. None of the above

Discuss this answer

According to the recommendations of IS : 456-1978, the expansion joints

A. Are provided where plane changes abruptly

B. Are provided to ensure minimum resistance

C. Do not carry reinforcement across them

D. All the above

Discuss this answer

Permissible compressive strength of M 200 concrete grade is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

Discuss this answer

Curing of pavements, floors, roofs and slabs, is done by

A. Membrane method

B. Ponding method

C. Covering surface with bags

D. Sprinkling water method

Discuss this answer

For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

A. Is always less than 1

B. Is always greater than 1

C. Can be more than 1

D. Can be less than 1

Discuss this answer

According to Whitney's theory, ultimate strain of concrete is assumed to be

A. 0.03 %

B. 0.1 %

C. 0.3 %

D. 3 %

Discuss this answer

Pick up the correct statement from the following:

A. Cement should be mixed for at least one minute

B. 10% of water is placed in the rotating drum before adding dry material

C. 10% of water is added after placing the other ingredients in the drum

D. All the above

Discuss this answer

For given water content, workability decreases if the concrete aggregates contain an excess of

A. Thin particles

B. Flat particles

C. Elongated particles

D. All the above

Discuss this answer

Which of the following statements is incorrect?

A. Higher Vee-Bee time shows lower workability

B. Higher slump shows higher workability

C. Higher compacting factor shows higher workability

D. None of the above

Discuss this answer

For concreting tunnel linings, transportation of concrete is done by

A. Pans

B. Wheel borrows

C. Containers

D. Pumps

Discuss this answer

If fineness modulus of sand is 2.5, it is graded as

A. Very fine sand

B. Fine sand

C. Medium sand

D. Coarse sand

Discuss this answer

Strength of concrete with passage of time

A. Increases

B. Decreases

C. Fluctuates

D. Remains constant

Discuss this answer

The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

A. f_cr - f_cs = f_cl

B. f_cr > f_cs > f_cl

C. f_cr < f_cs < f_cl

D. f_cs > f_cr > f_cl

Discuss this answer

The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

A. Compressive stress

B. Shear stress

C. Bond stress

D. Tensile stress

Discuss this answer

Accepted Answer

D. All the above

While designing an air entrained concrete

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

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:

Allowable shear strength of concrete, depends upon

Admixtures which cause early setting and hardening of concrete are called

Pick up the correct statement from the following:

For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:

The minimum cover in a slab should neither be less than the diameter of bar nor less than

W_p and W_f are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor (W_p/W_f) is 0.95, the workability of concrete is

Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is

The light weight aggregates are obtained from

Pick up the correct statement from the following:

Concrete gains strength due to

The strength of concrete after one year as compared to 28 days strength is about

High carbon content in the steel causes

According to IS: 4561978, the column or the strut is the member whose effective length is greater than

The ratio of the length to breadth of a wooden float, is

Critical section for shear in case of flat slabs is at a distance of

Poisson's ratio for concrete

According to the recommendations of IS : 456-1978, the expansion joints

Permissible compressive strength of M 200 concrete grade is

Curing of pavements, floors, roofs and slabs, is done by

For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

According to Whitney's theory, ultimate strain of concrete is assumed to be

Pick up the correct statement from the following:

For given water content, workability decreases if the concrete aggregates contain an excess of

Which of the following statements is incorrect?

For concreting tunnel linings, transportation of concrete is done by

If fineness modulus of sand is 2.5, it is graded as

Strength of concrete with passage of time

The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

Also checkout

While designing an air entrained concrete

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

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:

Allowable shear strength of concrete, depends upon

Admixtures which cause early setting and hardening of concrete are called

Pick up the correct statement from the following:

For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:

The minimum cover in a slab should neither be less than the diameter of bar nor less than

Wp and Wf are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor (Wp/Wf) is 0.95, the workability of concrete is

Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is

The light weight aggregates are obtained from

Pick up the correct statement from the following:

Concrete gains strength due to

The strength of concrete after one year as compared to 28 days strength is about

High carbon content in the steel causes

According to IS: 4561978, the column or the strut is the member whose effective length is greater than

The ratio of the length to breadth of a wooden float, is

Critical section for shear in case of flat slabs is at a distance of

Poisson's ratio for concrete

According to the recommendations of IS : 456-1978, the expansion joints

Permissible compressive strength of M 200 concrete grade is

Curing of pavements, floors, roofs and slabs, is done by

For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

According to Whitney's theory, ultimate strain of concrete is assumed to be

Pick up the correct statement from the following:

For given water content, workability decreases if the concrete aggregates contain an excess of

Which of the following statements is incorrect?

For concreting tunnel linings, transportation of concrete is done by

If fineness modulus of sand is 2.5, it is graded as

Strength of concrete with passage of time

The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

Also checkout

W_p and W_f are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor (W_p/W_f) is 0.95, the workability of concrete is

The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by