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4

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

A. 0.75 - 0.80

B. 0.80 - 0.85

C. 0.85 - 0.92

D. Above 0.92

Correct Answer :

D. Above 0.92


Related Questions

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4

The design yield stress of steel according to IS: 4561978 is: (Where fy is the characteristic yield strength of steel)

A. 0.37 fy

B. 0.57 fy

C. 0.67 fy

D. 0.87 fy

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4

The lower water cement ratio in concrete, introduces

A. Smaller creep and shrinkage

B. Greater density and smaller permeability

C. Improved frost resistance

D. All the above

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4

According to I.S. : 456, the number of grades of concrete mixes, is

A. 3

B. 4

C. 5

D. 7

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4

High temperature

A. Increases the strength of concrete

B. Decreases the strength of concrete

C. Has no effect on the strength of concrete

D. None of these

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4

Permissible compressive strength of M 150 concrete grade is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

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4

M10 grade of concrete approximates

A. 1 : 3 : 6 mix

B. 1 : 1 : 2 mix

C. 1 : 2 : 4 mix

D. 1 : 1.5 : 3 mix

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4

Pick up the incorrect statement applicable to the field test of good cement.

A. When one thrusts one's hand into a bag of cement, one should feel warm

B. The colour of the cement is bluish

C. By rubbing cement in between fingers, one should feed rough

D. All the above

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4

Which of the following has high tensile strength?

A. Plain hot rolled wires

B. Cold drawn wires

C. Heat treated rolled wires

D. All have same tensile strength

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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

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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

An aggregate is said to be flaky if its least dimension is less than

A. 1/5th of mean dimension

B. 2/5th of mean dimension

C. 3/5th of mean dimension

D. 4/5th of mean dimension

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4

For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is

A. 1 : 3 : 6

B. 1 : 1 ½ : 3

C. 1 : 2 : 4

D. 1 : 1 : 2

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4

The depth of footing for an isolated column is governed by (i) Maximum bending moment (ii) Shear force (iii) Punching shear The correct answer is

A. Only (i)

B. (i) and (ii)

C. (i) and (iii)

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

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4

The main object of compaction of concrete, is:

A. To eliminate air holes

B. To achieve maximum density

C. To provide intimate contact between the concrete and embedded materials

D. All the above

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4

Pick up the incorrect statement from the following:

A. The bottom and top ends of slump mould are parallel to each other

B. The axis of the mould is perpendicular to the end faces

C. The internal surface of the mould is kept clean and free from set cement

D. The mould is in the form of a frustum of hexagonal pyramid

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4

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

For the construction of cement concrete floor, the maximum permissible size of aggregate, is

A. 4 mm

B. 6 mm

C. 8 mm

D. 10 mm

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4

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

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4

If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is

A. 10 %

B. 12 %

C. 15 %

D. 25 %

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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

While compacting the concrete by a mechanical vibrator, the slump should not exceed

A. 2.5 cm

B. 5.0 cm

C. 7.5 cm

D. 10 cm

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4

If the storey height is equal to length of RCC wall, the percentage increase in strength is

A. 0

B. 10

C. 20

D. 30

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4

The average permissible stress in bond for plain bars in tension is

A. Increased by 10% for bars in compression

B. Increased by 25% for bars in compression

C. Decreased by 10% for bars in compression

D. Decreased by 25% for bars in compression

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4

Pick up the incorrect statement from the following:

A. A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water

B. The strength of concrete decreases as the water cement ratio increases

C. Good compaction by mechanical vibrations, increases the strength of concrete

D. None of these

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4

An excess of flaky particles in concrete aggregates

A. Decreases the workability

B. Increases the quantity of water and sand

C. More than 15% are not desirable

D. All 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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4

A flaky aggregate is said to be elongated if its length is

A. Equal to the mean size

B. Twice the mean size

C. Thrice the mean size

D. Four times the mean size

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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

In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

A. 10 %

B. 20 %

C. 30 %

D. 40 %

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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