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4

For quality control of Portland cement, the test essentially done is

A. Setting time

B. Tensile strength

C. Consistency

D. All the above

Correct Answer :

D. All the above


Related Questions

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4

The dimensions of a 35 litre forma for measuring aggregates by volume, are:

A. Length 30 cm, breadth 25 cm, height 30 cm

B. Length 39 cm, breadth 25 cm, height 32 cm

C. Length 27 cm, breadth 27 cm, height 48 cm

D. Length 220 cm, breadth 25 cm, height 40 cm

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4

Shrinkage of concrete depends upon
(i) Humidity of atmosphere
(ii) Passage of time
(iii) Stress The correct answer is

A. (i) and (ii)

B. (ii) and (iii)

C. Only (iii)

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

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4

The load carrying capacity of a helically reinforced column as compared to that of a tied column is about

A. 5 % less

B. 10 % less

C. 5 % more

D. 10 % more

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4

Strength of concrete with passage of time

A. Increases

B. Decreases

C. Fluctuates

D. Remains constant

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4

The commonly used material in the manufacture of cement is

A. Sand stone

B. Slate

C. Lime stone

D. Graphite

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4

If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

A. 20 %

B. 25 %

C. 30 %

D. 35 %

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4

Proper batching ensures

A. Economy

B. Durability

C. Workability

D. All the above

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4

Batching error means inaccuracy in the quantity of

A. Aggregates

B. Cement

C. Water

D. All the above

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4

Select the correct statement

A. Elastic modulus of high tensile steel is nearly the same as that of mild steel

B. Elastic modulus of high tensile steel is more than that of mild steel

C. Carbon percentage in high carbon steel is less than that in mild steel

D. High tensile steel is cheaper than mild steel

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4

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

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4

Internal friction between the ingredients of concrete, is decreased by using

A. Less water

B. Fine aggregates

C. Rich mix

D. More water and coarse aggregates

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4

Pick up the correct statement from the following:

A. Sand obtained from pits, is washed to remove clay and silt

B. Sand obtained from flooded pits, need not be washed before use

C. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous

D. All the above

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4

A concrete using an air entrained cement

A. Has strength less than 10% to 15%

B. Has more resistance to weathering

C. Is more plastic and workable

D. Is free from segregation and bleeding

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4

The percentage of voids in cement is approximately

A. 25 %

B. 40 %

C. 60 %

D. 80 %

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4

According to IS : 382-1963, a good aggregate should be

A. Chemically inert

B. Sufficiently strong

C. Hard and durable

D. All the above

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4

Water cement ratio is

A. Volume of water to that of cement

B. Weight of water to that of cement

C. Weight of concrete to that of water

D. Both (a) and (b) of the above

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4

Higher workability of concrete is required if the structure is

A. Made with cement concrete

B. Thick and reinforced

C. Thin and heavily reinforced

D. Thick and heavily reinforced

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4

Pick up the incorrect statement from the following:

A. Concrete for which preliminary tests are conducted, is called controlled concrete

B. Bulking of sand depends upon the fineness of grains

C. Concrete mix 1 : 6 : 12, is used for mass concrete in piers

D. All the above

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4

According to IS: 4561978, the flexural strength of concrete is

A. Directly proportional to compressive strength

B. Inversely proportional to compressive strength

C. Directly proportional to square root of compressive strength

D. Inversely proportional to square root of compressive strength

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4

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

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4

The purpose of reinforcement in pre-stressed concrete is

A. To provide adequate bond stress

B. To resist tensile stresses

C. To impart initial compressive stress in concrete

D. All of the above

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4

The shrinkage of concrete

A. Is proportional to water content is the mix

B. Is proportional to cement concrete

C. Increases with age of concrete

D. All the above

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4

The fineness modulus of fine aggregate is in the range of

A. 2.0 to 3.5

B. 3.5 to 5.0

C. 5.0 to 7.0

D. 6.0 to 8.5

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4

For a simply supported beam of span 15 m, the minimum effective depth to satisfy the vertical deflection limits should be

A. 600 mm

B. 750 mm

C. 900 mm

D. More than 1 m

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4

The bulk density of aggregates, depends upon

A. Shape

B. Grading

C. Compaction

D. All the above

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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

Specified compressive strength of concrete is obtained from cube tests at the end of

A. 3 days

B. 7 days

C. 21 days

D. 28 days

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4

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

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4

Proper proportioning of concrete, ensures

A. Desired strength and workability

B. Desired durability

C. Water tightness of the structure

D. All the above

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4

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

A. Compressive and tensile

B. Tensile and compressive

C. Both compressive

D. Both tensile