High temperature

Question

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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Proper proportioning of concrete, ensures

A. Desired strength and workability

B. Desired durability

C. Water tightness of the structure

D. All the above

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The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

A. Rounded aggregate

B. Irregular aggregate

C. Angular aggregate

D. Flaky aggregate

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Transport of concrete by pumps, is done for a distance of

A. 100 m

B. 200 m

C. 300 m

D. 400 m

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

A. 0.367 x_u

B. 0.416 x_u

C. 0.446 x_u

D. 0.573 x_u

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Ordinary concrete is not used for concrete grade

A. M 100

B. M 150

C. M 250

D. M 400

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The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

A. f_cr - f_cs = f_cl

B. f_cr > f_cs > f_cl

C. f_cr < f_cs < f_cl

D. f_cs > f_cr > f_cl

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Select the correct statement

A. Elastic modulus of high tensile steel is nearly the same as that of mild steel

B. Elastic modulus of high tensile steel is more than that of mild steel

C. Carbon percentage in high carbon steel is less than that in mild steel

D. High tensile steel is cheaper than mild steel

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The risk of segregation is more for

A. Wetter mix

B. Larger proportion of maximum size aggregate

C. Coarser grading

D. All the above

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The shrinkage of concrete

A. Is proportional to water content is the mix

B. Is proportional to cement concrete

C. Increases with age of concrete

D. All the above

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To prevent segregation, the maximum height for placing concrete, is

A. 100 cm

B. 125 cm

C. 150 cm

D. 200 cm

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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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Proper batching ensures

A. Economy

B. Durability

C. Workability

D. All the above

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Most common method of pre-stressing used for factory production is

A. Long line method

B. Freyssinet system

C. Magnel-Blaton system

D. Lee-Macall system

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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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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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If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

A. 15,900 litres

B. 16,900 litres

C. 17,900 litres

D. 18,900 litres

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Maximum distance between expansion joints in structures as per IS: 456 1978 is

A. 20 m

B. 30 m

C. 45 m

D. 60 m

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A construction joint is provided where

A. Bending moment is small

B. Shear force is small

C. The member is supported by other member

D. All the above

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Workability of concrete is inversely proportional to

A. Time of transit

B. Water-cement ratio

C. The air in the mix

D. Size of aggregate

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According to IS: 4561978, the maximum reinforcement in a column is

A. 2 %

B. 4 %

C. 6 %

D. 8 %

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Slump test of concrete is a measure of its

A. Consistency

B. Compressive strength

C. Tensile strength

D. Impact value

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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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Workability of concrete is measured by

A. Vicat apparatus test

B. Slump test

C. Minimum void method

D. Talbot Richard test

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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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According to IS: 4561978, the flexural strength of concrete is

A. Directly proportional to compressive strength

B. Inversely proportional to compressive strength

C. Directly proportional to square root of compressive strength

D. Inversely proportional to square root of compressive strength

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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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A higher modular ratio shows

A. Higher compressive strength of concrete

B. Lower compressive strength of concrete

C. Higher tensile strength of steel

D. Lower tensile strength of steel

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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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The strength and quality of concrete, depend upon:

A. Grading of aggregates

B. Surface area of aggregates

C. Shape of aggregates

D. All the above

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For concreting tunnel linings, transportation of concrete is done by

A. Pans

B. Wheel borrows

C. Containers

D. Pumps

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Accepted Answer

B. Decreases the strength of concrete

High temperature

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

Proper proportioning of concrete, ensures

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

Transport of concrete by pumps, is done for a distance of

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

Ordinary concrete is not used for concrete grade

The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

Select the correct statement

The risk of segregation is more for

The shrinkage of concrete

To prevent segregation, the maximum height for placing concrete, is

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

Proper batching ensures

Most common method of pre-stressing used for factory production is

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

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

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

Maximum distance between expansion joints in structures as per IS: 456 1978 is

A construction joint is provided where

Workability of concrete is inversely proportional to

According to IS: 4561978, the maximum reinforcement in a column is

Slump test of concrete is a measure of its

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

Workability of concrete is measured by

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

According to IS: 4561978, the flexural strength of concrete is

The purpose of reinforcement in pre-stressed concrete is

A higher modular ratio shows

To ensure constant moisture content in aggregates

The strength and quality of concrete, depend upon:

For concreting tunnel linings, transportation of concrete is done by

Also checkout

High temperature

Correct Answer :

Show all Concrete Technology and Design MCQ

Related Questions

Proper proportioning of concrete, ensures

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

Transport of concrete by pumps, is done for a distance of

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)

Ordinary concrete is not used for concrete grade

The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

Select the correct statement

The risk of segregation is more for

The shrinkage of concrete

To prevent segregation, the maximum height for placing concrete, is

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

Proper batching ensures

Most common method of pre-stressing used for factory production is

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

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

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

Maximum distance between expansion joints in structures as per IS: 456 1978 is

A construction joint is provided where

Workability of concrete is inversely proportional to

According to IS: 4561978, the maximum reinforcement in a column is

Slump test of concrete is a measure of its

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

Workability of concrete is measured by

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

According to IS: 4561978, the flexural strength of concrete is

The purpose of reinforcement in pre-stressed concrete is

A higher modular ratio shows

To ensure constant moisture content in aggregates

The strength and quality of concrete, depend upon:

For concreting tunnel linings, transportation of concrete is done by

Also checkout

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

The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by