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4

If a beam fails in bond, then its bond strength can be increased most economically by

A. Increasing the depth of beam

B. Using thinner bars but more in number

C. Using thicker bars but less in number

D. Providing vertical stirrups

Correct Answer :

B. Using thinner bars but more in number


Related Questions

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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

Tricalcium aluminate (C3A)

A. Reacts fast with water

B. Generates less heat of hydration

C. Causes initial setting and early strength of cement

D. Does not contribute to develop ultimate strength

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4

The factor which affects workability, is

A. Water content and its temperature

B. Shape and size of the aggregates

C. Air entraining agents

D. All the above

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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

The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

A. Top face perpendicular to wall

B. Bottom face perpendicular to wall

C. Both top and bottom faces perpendicular to wall

D. None of the above

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4

Pick up the correct statement from the following:

A. High percentage of C3S and low percentage of C2S cause rapid hardening

B. High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack

C. Low percentage of C3S and high percentage of C2S contribute to slow hardening

D. All the above

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4

Ordinary concrete is not used for concrete grade

A. M 100

B. M 150

C. M 250

D. M 400

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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

In a ring beam subjected to uniformly distributed load (i) Shear force at mid span is zero (ii) Shear force at mid span is maximum (iii) Torsion at mid span is zero (iv) Torsion at mid span is maximum 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

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

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

A. 1.5

B. 2.0

C. 2.5

D. 3.0

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4

Efflorescence in cement is caused due to an excess of

A. Alumina

B. Iron oxide

C. Silica

D. Alkalis

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4

When shear stress exceeds the permissible limit in a slab, then it is reduced by

A. Increasing the depth

B. Providing shear reinforcement

C. Using high strength steel

D. Using thinner bars but more in number

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4

The final operation of finishing floors, is known as

A. Screeding

B. Floating

C. Trowelling

D. Finishing

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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

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

Pick up the correct statement from the following:

A. The weight of ingredients of concrete mix, is taken in kilograms

B. Water and aggregates are measured in litres

C. 20 bags of cement make one tonne

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

Pick up the correct statement from the following:

A. Higher workability indicates unexpected increase in the moisture content

B. Higher workability indicates deficiency of sand

C. If the concrete mix is dry, the slump is zero

D. All the above

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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

For given water content, workability decreases if the concrete aggregates contain an excess of

A. Thin particles

B. Flat particles

C. Elongated particles

D. All the above

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4

An aggregate is known as cyclopean aggregate if its size is more than

A. 4.75 mm

B. 30 mm

C. 60 mm

D. 75 mm

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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

The load factors for live load and dead load are taken respectively as

A. 1.5 and 2.2

B. 2.2 and 1.5

C. 1.5 and 1.5

D. 2.2 and 2.2

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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

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 factor of safety for

A. Steel and concrete are same

B. Steel is lower than that for concrete

C. Steel is higher than that for concrete

D. None of the above

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4

The critical section for finding maximum bending moment for footing under masonry wall is located

A. At the middle of the wall

B. At the edge of the wall

C. Halfway between the middle and edge of the wall

D. At a distance equal to effective depth of footing from the edge of the wall

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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

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