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4

The minimum diameter of longitudinal bars in a column is

A. 6 mm

B. 8 mm

C. 12 mm

D. 16 mm

Correct Answer :

C. 12 mm


Related Questions

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4

The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

A. 30 minutes

B. 40 minutes

C. 60 minutes

D. 90 minutes

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4

For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

A. 15 mm

B. 25 mm

C. 30 mm

D. 40 mm

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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

Concrete gains strength due to

A. Chemical reaction of cement with sand and coarse aggregates

B. Evaporation of water from concrete

C. Hydration of cement

D. All the above

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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

Saw dust can be rendered chemically inert by boiling it in water containing

A. Ferrous sulphate

B. Potassium chloride

C. Ammonia

D. Nitric acid

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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

The datum temperature for maturity by Plowman, is

A. 23°C

B.

C. - 5.6°C

D. - 11.7°C

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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

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

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 effect of adding calcium chloride in concrete is (i) To increase shrinkage (ii) To decrease shrinkage (iii) To increase setting time (iv) To decrease setting time The correct answer is

A. (i) and (iii)

B. (i) and (iv)

C. (ii) and (iii)

D. (ii) and (iv)

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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

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. An increase in water content must be accompanied by an increase in cement content

B. Angular and rough aggregates reduce the workability of the concrete

C. The slump of the concrete mix decreases due to an increase in temperature

D. All the above

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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

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

The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

A. 100 kg/cm2

B. 150 kg/cm2

C. 200 kg/cm2

D. 250 kg/cm2

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4

Too wet concrete may cause

A. Weakness of concrete

B. Excessive laitance

C. Segregation

D. All the above

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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

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4

The most commonly used admixture which prolongs the setting and hardening time is

A. Gypsum

B. Calcium chloride

C. Sodium silicate

D. All of the above

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4

For preparing ordinary concrete, the quantity of water used, is

A. 5% by weight of aggregates plus 20% of weight of cement

B. 10% by weight of aggregates plus 10% of weight of cement

C. 5% by weight of aggregates plus 30% of weight of cement

D. 30% by weight of aggregates plus 10% of weight of cement

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4

According to Water-Cement Ratio Law, the strength of workable plastic concrete

A. Depends upon the amount of water used in the mix

B. Does not depend upon the quality of cement mixed with aggregates

C. Does not depend upon the quantity of cement mixed with aggregates

D. All the above

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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

Curing of pavements, floors, roofs and slabs, is done by

A. Membrane method

B. Ponding method

C. Covering surface with bags

D. Sprinkling water method

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4

The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

A. Between 150 to 300 kg/cm2

B. Between 350 to 600 kg/cm2

C. Between 150 to 500 kg/cm2

D. Below 200 kg/cm2

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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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4

The aggregate impact value of the aggregate used in

A. Building concrete is less than 45

B. Road pavement concrete is less than 30

C. Runway concrete is less than 30

D. All the above

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4

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

A. 7.30

B. 7.35

C. 7.40

D. 7.45

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4

A T-shaped retaining wall mainly consists of

A. One cantilever

B. Two cantilevers

C. Three cantilevers

D. Four cantilevers