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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

Correct Answer :

D. Thick and heavily reinforced


Related Questions

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C.R.R.I. charts are used to obtain a relationship between strength of concrete and

A. Water cement ratio

B. Workability

C. Grading of aggregate

D. Fineness modulus

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Log Angles machine is used to test the aggregate for

A. Crushing strength

B. Impact value

C. Abrasion resistance

D. Water absorption

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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

Pick up the correct statement from the following:

A. The concrete gains strength due to hydration of cement

B. The concrete does not set at freezing point

C. The strength of concrete increases with its age

D. All the above

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4

An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. sieve No. 9, more than

A. 5 %

B. 10 %

C. 15 %

D. 20 %

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4

If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is

A. 10 %

B. 12.5 %

C. 15 %

D. 18.5 %

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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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Pick up the correct statement from the following:

A. The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing

B. The total water is the free water and the amount actually absorbed by the aggregates

C. Neither (a) nor (b)

D. Both (a) and (b)

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4

In a pile of length l, the points of suspension from ends for lifting it are located at

A. 0.207 l

B. 0.25 l

C. 0.293 l

D. 0.333 l

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4

Which of the following R.C. retaining walls is suitable for heights beyond 6 m?

A. L-shaped wall

B. T-shaped wall

C. Counterfort type

D. All of the above

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4

The commercial name of white and coloured cement in India, is

A. Colorcrete

B. Silvicrete

C. Snowcem

D. All the above

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The aggregate containing moisture in pores and having its surface dry, is known as

A. Moist aggregates

B. Very dry aggregates

C. Dry aggregates

D. Saturated surface dry aggregate

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4

Maximum percentage reinforcement in case of slabs is limited to

A. 2

B. 4

C. 6

D. 8

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4

The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (Where xu is the depth of neutral axis at the limit state of collapse)

A. 0.367 xu

B. 0.416 xu

C. 0.446 xu

D. 0.573 xu

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'Ware house pack' of cement means

A. Full capacity of the ware house

B. Pressure exertion of the bags of upper layers

C. Pressure compaction of the bags on lower layers

D. Packing the ware house

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The commonly used material in the manufacture of cement is

A. Sand stone

B. Slate

C. Lime stone

D. Graphite

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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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Di-calcium silicate (C2S)

A. Hydrates rapidly

B. Generates less heat of hydration

C. Hardens rapidly

D. Provides less ultimate strength to cement

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Pick up the incorrect statement from the following:

A. Space between the exterior walls of a warehouse and bag piles should be 30 cm

B. Cement bags should preferably be piled on wooden planks

C. Width and height of the pile should not exceed 3 m and 2.70 m respectively

D. None of these

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4

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

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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

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

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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

Addition of pozzolana to cement causes

A. Reduction in permeability

B. Loss of heat of hydration

C. Reduction in bleeding

D. All the above

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4

If the size of panel in a flat slab is 6 m × 6 m, then as per Indian Standard Code, the widths of column strip and middle strip are

A. 3.0 m and 1.5 m

B. 1.5 m and 3.0 m

C. 3.0 m and 3.0 m

D. 1.5 m and 1.5 m

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4

The rock which is not calcareous, is:

A. Lime stone

B. Chalk

C. Laterite

D. None of these

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For the construction of cement concrete dams, the maximum permissible size of the aggregates, is

A. 40 mm

B. 50 mm

C. 60 mm

D. 70 mm

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The mixture of different ingredients of cement, is burnt at

A. 1000°C

B. 1200°C

C. 1400°C

D. 1600°C

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The maximum amount of dust which may be permitted in aggregates is

A. 5% of the total aggregates for low workability with a coarse grading

B. 10% of the total aggregates for low workability with a fine grading

C. 20% of the total aggregates for a mix having high workability with fine grading

D. All the above

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4

Pick up the incorrect statement from the following. For performing compressive strength test of cement

A. Cement and standard sand mortar are used in the ratio of 1 : 3

B. Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of water for standard consistency

C. A cube mould of 10 cm × 10 cm × 10 cm is used

D. The prepared moulds are kept in a atmosphere of 50% relative humidity