Online Civil Engineering Test - Concrete Technology Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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The bulk density of aggregates does not depend upon :

size and shape of aggregates

specific gravity of aggregates

grading of aggregates

size and shape of the container

none of these.

[#]

If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is

7.30

7.35

7.40

7.45

none of these.

[#]

If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is

[#]

To ensure constant moisture content in aggregates

area of each aggregate pile should be large

height of each aggregate pile should not exceed 1.50 m

aggregate pile should be left for 24 hours before aggregates are used

conical heaps of aggregates should be avoided to prevent moisture variation

all the above.

[#]

M 150 grade of concrete approximates

1 : 3 : 6 mix

1 : 1 :2 mix

1 : 2 : 4 mix

1 : 1.5 : 3 mix

none of these.

[#]

The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is

30%

40%

50%

60%.

[#]

Hardening of cement occurs at

rapid rate during the first few days and afterwards it continues to increase at a decreased rate

slow rate during the first few days and afterwards it continues to increase at a rapid rate

uniform rate throughout its age

none of these.

[#]

The maximum thickness of concrete floor of a cement warehouse, is

10 cm

15 cm

20 cm

25 cm

30 cm

[#]

For compacting plain concrete road surface of thickness less than 20 cm, we use

internal vibrator

screed vibrator

form vibrator

none of these.

[#]

10.

A construction joint is provided where

bending moment is small

shear force is small

the member is supported by other member

all the above.

[#]

11.

Addition of pozzolana to cement

decreases workability

increases strength

increases heat of hydration

decreases curing time

none of these.

[#]

12.

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

cement and standard sand mortar are used in the ratio of 1 : 3

water is added at the rate of

+ 3.0 percentage of water where P is the percentage of water for standard consistency

A cube mould of 10 cm x 10 cm x 10 cm is used

The perpared moulds are kept in a atmosphere of 90% relative humidity

The temperature of water in the submerged tank for curing moulds, should be 27° ± 2°C.

[#]

13.

The most useless aggregate is one whose surface texture is

smooth

granular

glassy

honey combed and porous.

[#]

14.

Pick up the correct statement from the following:

Sand stones may be divided into calcareous, siliceous and ferrugineous sand stones

Concrete using sand stones, cracks due to excessive shrinkage

Very hard and close grained crystallined lime stones are suitable aggregates but provide low strength

Broken bricks produce a concrete having good fire resisting qualities

All the above.

[#]

15.

The type of aggregates of same nominal size, which contain less voids when compacted, are

rounded spherical

irregular

flaky

none of these.

[#]

16.

If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is

2000 bags

2200 bags

2400 bags

2700 bags

3000 bags

[#]

17.

Di-calcium silicate (C₂S)

hydrates rapidly

generates less heat of hydration

hardens rapidly

provides less ultimate strength to cement

has less resistance to sulphate attack.

[#]

18.

Pick up the incorrect statement from the following:

Workability of the concrete mix decreases with an increase in the moisture content

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

Bulking of sand depends upon the fineness of grains

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

All the above.

[#]

19.

The surface where two successive placements of concrete meet, is known as

Contraction joint

Expansion joint

Construction joint

both (a) and (b)

both (6) and (c).

[#]

20.

On a grading curve, the gap grading is represented by

a horizontal line

a vertical line

N.W. inclined line

N.E. inclined line

none of these.

[#]

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Online Civil Engineering Test - Concrete Technology Test

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