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4

In the method of voids for determination of the quantity of cement paste, it is assumed that

A. Voids in coarse aggregates are filled by fine aggregates

B. Voids in fine aggregates are filled by the cement paste

C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra

D. All the above

Correct Answer :

D. All the above


Related Questions

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4

Gypsum is added for

A. Colour

B. Strength

C. Controlling setting time

D. None of these

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4

Concrete containing

A. Siliceous aggregates, has higher co-efficient of expansion

B. Igneous aggregates, has intermediate coefficient of expansion

C. Lime stones, has lowest co-efficient of expansion

D. All the above

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4

To ensure constant moisture content in aggregates

A. Area of each aggregate pile should be large

B. Height of each aggregate pile should not exceed 1.50 m

C. Aggregate pile should be left for 24 hours before aggregates are used

D. All the above

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4

Pick up the correct statement from the following:

A. The quality of water governs the strength of concrete

B. 10% excess of water reduces the strength of concrete by 15%

C. 30% excess of water reduces the strength of concrete by 50%

D. All the above

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4

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

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4

Pick up the correct statement from the following:

A. Water enables chemical reaction to take place with cement

B. Water lubricates the mixture of gravel, sand and cement

C. Strength of concrete structure largely depends upon its workability

D. All the above

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4

You are asked to construct a massive dam, the type of cement you will use, is

A. Ordinary Portland cement

B. Rapid hardening cement

C. Low heat cement

D. Blast furnace slag cement

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4

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

A. Extremely low

B. Very low

C. Low

D. High

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4

The recommended value of modular ratio for reinforced brick work is

A. 18

B. 30

C. 40

D. 58

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4

If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

A. Balanced beam

B. Under-reinforced beam

C. Over-reinforced beam

D. None of the above

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4

Proper batching ensures

A. Economy

B. Durability

C. Workability

D. All the above

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4

Separation of coarse aggregates from mortar during transportation, is known

A. Bleeding

B. Creeping

C. Segregation

D. Shrinkage

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4

Pick up the correct statement from the following:

A. Continuous grading is not necessary for obtaining a minimum of air voids

B. The omission of a certain size of aggregate is shown by a straight horizontal line on the grading curve

C. The omission of a certain size of aggregate in concrete increases the workability but also increases the liability to segregation

D. All the above

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4

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

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4

For the construction of the retaining structures, the type of concrete mix to be used, is

A. 1 : 3 : 6

B. 1 : 2 : 4

C. 1 : 1 ½ : 3

D. 1 : 4 : 8

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4

The impurity of mixing water which affects the setting time and strength of concrete, is

A. Sodium sulphates

B. Sodium chlorides

C. Sodium carbonates and bicarbonates

D. Calcium bicarbonates

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4

On a grading curve, the gap grading is represented by

A. A horizontal line

B. A vertical line

C. N.W. inclined line

D. N.E. inclined line

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4

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

A. 5 %

B. 10 %

C. 15 %

D. 20 %

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4

In the method of voids for determination of the quantity of cement paste, it is assumed that

A. Voids in coarse aggregates are filled by fine aggregates

B. Voids in fine aggregates are filled by the cement paste

C. Volume of fine aggregates is equal to total voids in coarse aggregates plus 10% extra

D. All the above

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4

Pre-stress loss due to friction occurs

A. Only in post-tensioned beams

B. Only in pre-tensioned beams

C. In both post-tensioned and pre-tensioned beams

D. None of the above

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4

Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

A. 28 liters

B. 30 liters

C. 32 liters

D. 34 liters

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4

To minimise the effect of differential settlement, the area of a footing should be designed for

A. Dead load only

B. Dead load + live load

C. Dead load + fraction of live load

D. Live load + fraction of dead load

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4

A beam curved in plan is designed for

A. Bending moment and shear

B. Bending moment and torsion

C. Shear and torsion

D. Bending moment, shear and torsion

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4

Pozzolana cement is used with confidence for construction of

A. Dams

B. Massive foundations

C. R.C.C. structures

D. All the above

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4

Horizontal construction joints in concrete walls are generally provided at

A. Soffit level

B. Window sill level

C. Floor level

D. All the above

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4

For the construction of thin R.C.C. structures, the type of cement to be avoided, is

A. Ordinary Portland cement

B. Rapid hardening cement

C. Low heat cement

D. Blast furnace slag cement

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4

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

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4

Admixtures which cause early setting and hardening of concrete are called

A. Workability admixtures

B. Accelerators

C. Retarders

D. Air entraining agents

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The factor which affects workability, is

A. Water content and its temperature

B. Shape and size of the aggregates

C. Air entraining agents

D. All the above

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Curing

A. Reduces the shrinkage of concrete

B. Preserves the properties of concrete

C. Prevents the loss of water by evaporation

D. All of the above