The addition of gypsum to portland cement helps in : (1) increasing the strength of cement (2) rapid setting of cement (3) preventing rapid setting of cement (4) reduction in the cost of cement

The addition of gypsum to portland cement helps in : (1) increasing the strength of cement (2) rapid setting of cement (3) preventing rapid setting of cement (4) reduction in the cost of cement
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preventing rapid setting of cement
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(3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of aluminium- and ironcontaining clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass. Cement sets when mixed with water by way of a complex series of chemical reactions still only partly understood.

Description : (3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of ... mixed with water by way of a complex series of chemical reactions still only partly understood.

Last Answer : Milk is a colloidal system in which: (1) Water is dispersed in fat (2) Fat is dispersed in water (3) Fat and water are dispersed in each other (4) Fat is dissolved

The addition of Gypsum to Portland cement helps in–

Description : The addition of Gypsum to Portland cement helps in–

Last Answer : Preventing rapid settling of cement

addition of Gypsum to Portland cement helps in

Description : addition of Gypsum to Portland cement helps in

Last Answer : Preventing rapid settling of cement

Pick out the wrong statement. (A) High early strength cement are made from materials having high silica to lime ratio (B) The function of gypsum in cement is to enhance its initial setting rate (C) Acid resistant cements are known as silicate cement (D) Major component of greyish Portland cement is tricalcium silicate

Description : Pick out the wrong statement. (A) High early strength cement are made from materials having high silica to lime ratio (B) The function of gypsum in cement is to enhance its initial ... cements are known as silicate cement (D) Major component of greyish Portland cement is tricalcium silicate

Last Answer : (A) High early strength cement are made from materials having high silica to lime ratio

Pick out the wrong statement. (A) Dry process is used for the manufacture of cement, when the raw material is blast furnace slag (B) Portland cement is made employing wet process (C) Gypsum is added to Portland cement to lengthen its setting time (D) None of these

Description : Pick out the wrong statement. (A) Dry process is used for the manufacture of cement, when the raw material is blast furnace slag (B) Portland cement is made employing wet process (C) Gypsum is added to Portland cement to lengthen its setting time (D) None of these

Last Answer : (D) None of these

For construction of structures in sea water, the cement generally preferred to, is (A) Portland-pozzolana cement (B) Quick setting cement (C) Low heat Portland cement (D) Rapid hardening cement

Description : For construction of structures in sea water, the cement generally preferred to, is (A) Portland-pozzolana cement (B) Quick setting cement (C) Low heat Portland cement (D) Rapid hardening cement

Last Answer : Answer: Option A

Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as (A) Quick setting cement (B) Rapid hardening cement (C) White cement (D) Low heat Portland cement

Description : Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as (A) Quick setting cement (B) Rapid hardening cement (C) White cement (D) Low heat Portland cement

Last Answer : Answer: Option C

The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as (A) Low-heat Portland cement (B) Rapid hardening Portland cement (C) Portland blast slag cement (D) Portland pozzolana cement

Description : The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as (A) Low-heat Portland cement (B) Rapid hardening Portland cement (C) Portland blast slag cement (D) Portland pozzolana cement

Last Answer : Answer: Option A

Which of the following cements is expected to have the highest compressive strength after 3 days (a) Ordinary Portland cement (b) Rapid hardening cement (c) High alumina cement (d) Sulphate resisting cement.

Description : Which of the following cements is expected to have the highest compressive strength after 3 days (a) Ordinary Portland cement (b) Rapid hardening cement (c) High alumina cement (d) Sulphate resisting cement.

Last Answer : (c) High alumina cement

The function of gypsum addition during cement making is to (A) Increase the density of cement (B) Decrease the cement setting rate (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : The function of gypsum addition during cement making is to (A) Increase the density of cement (B) Decrease the cement setting rate (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (B) Decrease the cement setting rate

Rapid hardening cement attains early strength due to (A) Larger proportion of lime grounded finer than normal cement (B) Lesser proportion of lime grounded coarser than normal cement (C) Lesser proportion of lime grounded finer than normal cement (D) Excess percentage of gypsum

Description : Rapid hardening cement attains early strength due to (A) Larger proportion of lime grounded finer than normal cement (B) Lesser proportion of lime grounded coarser than normal cement (C) Lesser proportion of lime grounded finer than normal cement (D) Excess percentage of gypsum

Last Answer : Answer: Option A

Early attainment of strength in rapid hardening cement is mainly due to (A) Gypsum (B) Finer grinding (C) Tri-calcium silicate (D) Tri-calcium aluminate

Description : Early attainment of strength in rapid hardening cement is mainly due to (A) Gypsum (B) Finer grinding (C) Tri-calcium silicate (D) Tri-calcium aluminate

Last Answer : Answer: Option B

For quality control of Portland cement, the test essentially done is (A) Setting time (B) Tensile strength (C) Consistency (D) All the above

Description : For quality control of Portland cement, the test essentially done is (A) Setting time (B) Tensile strength (C) Consistency (D) All the above

Last Answer : D

The gypsum is added to the cement for (a) Providing high strength to the cement (b) Controlling the initial setting time of cement. (c) Lowering the clinkering temp of cement (d) All the above.

Description : The gypsum is added to the cement for (a) Providing high strength to the cement (b) Controlling the initial setting time of cement. (c) Lowering the clinkering temp of cement (d) All the above.

Last Answer : (b) Controlling the initial setting time of cement.

Main constituents of Portland cement are calcium aluminate and (A) Gypsum(B) Silicates(C) Sodium silicate(D) Carbonates

Description : Main constituents of Portland cement are calcium aluminate and (A) Gypsum (B) Silicates (C) Sodium silicate (D) Carbonates

Last Answer : (B) Silicates

Ordinary Portland cement is manufactured from (A) Lime stone and clay (B) Gypsum and lime (C) Pozzolana (D) Lime, pozzolana and clay

Description : Ordinary Portland cement is manufactured from (A) Lime stone and clay (B) Gypsum and lime (C) Pozzolana (D) Lime, pozzolana and clay

Last Answer : Answer: Option B

How does the setting of cement takes place & what is the role of gypsum in setting of cement ?

Description : How does the setting of cement takes place & what is the role of gypsum in setting of cement ?

Last Answer : Ans When mixed with water, the setting of cement takes place to give a hard mass. This is due to the hydration of the molecules of the constituents and their Rearrangement. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened.

How does the setting of cement takes place & what is the role of gypsum in setting of cement ?

Description : How does the setting of cement takes place & what is the role of gypsum in setting of cement ?

Last Answer : When mixed with water, the setting of cement takes place to give a hard mass. This is due to the hydration of the molecules of the constituents and their rearrangement. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened. 

Addition of pozzolana to ordinary port land cement, causes (A) Decrease in early strength (B) Reduction in chemical action with sulphates (C) Increase in shrinkage (D) All the above

Description : Addition of pozzolana to ordinary port land cement, causes (A) Decrease in early strength (B) Reduction in chemical action with sulphates (C) Increase in shrinkage (D) All the above

Last Answer : Answer: Option D

You are asked to construct a massive dam, the type of cement you will use, is (A) Ordinary Portland cement (B) Rapid hardening cement (C) Low heat cement (D) Blast furnace slag cement

Description : You are asked to construct a massive dam, the type of cement you will use, is (A) Ordinary Portland cement (B) Rapid hardening cement (C) Low heat cement (D) Blast furnace slag cement

Last Answer : Answer: Option C

For the construction of thin R.C.C. structures, the type of cement to be avoided, is (A) Ordinary Portland cement (B) Rapid hardening cement (C) Low heat cement (D) Blast furnace slag cement

Description : For the construction of thin R.C.C. structures, the type of cement to be avoided, is (A) Ordinary Portland cement (B) Rapid hardening cement (C) Low heat cement (D) Blast furnace slag cement

Last Answer : Answer: Option D

For road pavements, the cement generally used, is (A) Ordinary Portland cement (B) Rapid hardening cement (C) Low heat cement (D) Blast furnace slag cement

Description : For road pavements, the cement generally used, is (A) Ordinary Portland cement (B) Rapid hardening cement (C) Low heat cement (D) Blast furnace slag cement

Last Answer : Answer: Option B

Which of the following cements is suitable for use in massive concrete structures such as large dams? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

Description : Which of the following cements is suitable for use in massive concrete structures such as large dams? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

Last Answer : Answer: Option B

Which of the following cements contains maximum percentage of dicalcium silicate? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

Description : Which of the following cements contains maximum percentage of dicalcium silicate? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

Last Answer : Answer: Option B

For mass concrete work, the type of cement preferable is [ A ] Ordinary Portland cement [ B ] Rapid hardening cement [ C ] Low heat cement [ D ] Blast furnace slag cement

Description : For mass concrete work, the type of cement preferable is [ A ] Ordinary Portland cement [ B ] Rapid hardening cement [ C ] Low heat cement [ D ] Blast furnace slag cement

Last Answer : [ C ] Low heat cement

For road pavements, the cement generally used, is [ A ] Ordinary Portland cement [ B ] Rapid hardening cement [ C ] Low heat cement [ D ] Blast furnace slag cement

Description : For road pavements, the cement generally used, is [ A ] Ordinary Portland cement [ B ] Rapid hardening cement [ C ] Low heat cement [ D ] Blast furnace slag cement

Last Answer : [ A ] Ordinary Portland cement

When compared to ordinary Portland cement, Rapid hardening Portland cement contains ______________ amount of lime content [ A ] Equal [ B ] Greater [ C ] Lesser [ D ] Zero

Description : When compared to ordinary Portland cement, Rapid hardening Portland cement contains ______________ amount of lime content [ A ] Equal [ B ] Greater [ C ] Lesser [ D ] Zero

Last Answer : [ B ] Greater

Which cement should not be used for bridge slabs ro RCC frames a) OPC b) Portland Pozzolana cement * c) Portland furnace slag cement d) Rapid hardening cement

Description : Which cement should not be used for bridge slabs ro RCC frames a) OPC b) Portland Pozzolana cement * c) Portland furnace slag cement d) Rapid hardening cement

Last Answer : b) Portland Pozzolana cement *

Addition of pozzolana to ordinary Portland cement increases (A) Bleeding (B) Shrinkage (C) Permeability (D) Heat of hydration

Description : Addition of pozzolana to ordinary Portland cement increases (A) Bleeding (B) Shrinkage (C) Permeability (D) Heat of hydration

Last Answer : Answer: Option B

For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

Description : For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

Last Answer : (C) Initial setting time is not less than 30 minutes

As compared to ordinary Portland cement, high alumina cement has (A) Higher initial setting time but lower final setting time (B) Lower initial setting time but higher final setting time (C) Higher initial and final setting times (D) Lower initial and final setting times

Description : As compared to ordinary Portland cement, high alumina cement has (A) Higher initial setting time but lower final setting time (B) Lower initial setting time but higher final setting time (C) Higher initial and final setting times (D) Lower initial and final setting times

Last Answer : Answer: Option A

As per IS specifications, the maximum final setting time for ordinary Portland cement should be (A) 30 minutes (B) 1 hour (C) 6 hours (D) 10 hour

Description : As per IS specifications, the maximum final setting time for ordinary Portland cement should be (A) 30 minutes (B) 1 hour (C) 6 hours (D) 10 hour

Last Answer : Answer: Option D

The initial setting time for ordinary Portland cement as per IS specifications should not be less than (A) 10 minutes (B) 30 minutes (C) 60 minutes (D) 600 minutes

Description : The initial setting time for ordinary Portland cement as per IS specifications should not be less than (A) 10 minutes (B) 30 minutes (C) 60 minutes (D) 600 minutes

Last Answer : Answer: Option B

According to IS Code , the requirement of an ordinary Portland cement is (a) The residue does not exceed 10% when sieved through is sieve no .9 (b) Its initial setting time is not less than 30 minutes. (c) its expansion is not morethan 10mm for unaerated cement (d) All the above.

Description : According to IS Code , the requirement of an ordinary Portland cement is (a) The residue does not exceed 10% when sieved through is sieve no .9 (b) Its initial setting time is not less than 30 minutes. (c) its expansion is not morethan 10mm for unaerated cement (d) All the above.

Last Answer : (d) All the above.

Setting time of cement increases by adding (A) Gypsum (B) Hydrogen peroxide (C) Calcium chloride (D) Sodium oxide

Description : Setting time of cement increases by adding (A) Gypsum (B) Hydrogen peroxide (C) Calcium chloride (D) Sodium oxide

Last Answer : Answer: Option A

Quick setting cement is produced by adding (A) Less amount of gypsum in very fine powdered form (B) More amount of gypsum in very fine powdered form (C) Aluminium sulphate in very fine powdered form (D) Pozzolana in very fine powdered form

Description : Quick setting cement is produced by adding (A) Less amount of gypsum in very fine powdered form (B) More amount of gypsum in very fine powdered form (C) Aluminium sulphate in very fine powdered form (D) Pozzolana in very fine powdered form

Last Answer : Answer: Option C

To retard the initial setting time of cement, the compound responsible, is (A) Tri-calcium silicate (B) Gypsum (C) Di-calcium silicate (D) Tri-calcium aluminate

Description : To retard the initial setting time of cement, the compound responsible, is (A) Tri-calcium silicate (B) Gypsum (C) Di-calcium silicate (D) Tri-calcium aluminate

Last Answer : Answer: Option B

Setting time of cement increases by adding (i)gypsum (ii)sodium oxide (iii)calcium chloride [ A ] i [ B ] i and ii [ C ] i and iii [ D ] i, ii and iii

Description : Setting time of cement increases by adding (i)gypsum (ii)sodium oxide (iii)calcium chloride [ A ] i [ B ] i and ii [ C ] i and iii [ D ] i, ii and iii

Last Answer : [ A ] i

A slow setting cement will have higher percentage of a) tricalcium aluminate b) tricalcium silicate c) Gypsum d) Dicalcium silicate*

Description : A slow setting cement will have higher percentage of a) tricalcium aluminate b) tricalcium silicate c) Gypsum d) Dicalcium silicate*

Last Answer : C2s

Newly constructed pavement with ordinary Portland cement attains its working strength after (A) 7 days (B) 14 days (C) 21 days (D) 28 days

Description : Newly constructed pavement with ordinary Portland cement attains its working strength after (A) 7 days (B) 14 days (C) 21 days (D) 28 days

Last Answer : Answer: Option D

As compared to ordinary Portland cement, use of pozzolana cement (A) Reduces workability (B) Increases bleeding (C) Increases shrinkage (D) Increases strength

Description : As compared to ordinary Portland cement, use of pozzolana cement (A) Reduces workability (B) Increases bleeding (C) Increases shrinkage (D) Increases strength

Last Answer : Answer: Option C

The compound of Portland cement which contributes to the strength after two to three years is (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra-calcium alumino ferrite

Description : The compound of Portland cement which contributes to the strength after two to three years is (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra-calcium alumino ferrite

Last Answer : Answer: Option B

According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than (A) 7 MPa (B) 11.5 MPa (C) 16 MPa (D) 21 MPa

Description : According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than (A) 7 MPa (B) 11.5 MPa (C) 16 MPa (D) 21 MPa

Last Answer : Answer: Option C

The compressive strength an ordinary Portland cement (1:3) after 7 days test should not be less than. (a) 11N/mm2 (b) 17.5 N/mm2 (c) 22 N/mm2 (d) 27.5N/m2

Description : The compressive strength an ordinary Portland cement (1:3) after 7 days test should not be less than. (a) 11N/mm2 (b) 17.5 N/mm2 (c) 22 N/mm2 (d) 27.5N/m2

Last Answer : (b) 17.5 N/mm2

Minimum compressive strength of cement required at the age of 3 days for ordinary Portland cement of grade 33 is [ A ] 1.15 N/mm2 [ B ] 11.5 N/mm2 [ C ] 2.10 N/mm2 [ D ] 21 N/mm2

Description : Minimum compressive strength of cement required at the age of 3 days for ordinary Portland cement of grade 33 is [ A ] 1.15 N/mm2 [ B ] 11.5 N/mm2 [ C ] 2.10 N/mm2 [ D ] 21 N/mm2

Last Answer : [ B ] 11.5 N/mm2

Gypsum is added for (A) Colour (B) Strength (C) Controlling setting time (D) None of these

Description : Gypsum is added for (A) Colour (B) Strength (C) Controlling setting time (D) None of these

Last Answer : Answer: Option C

What is the function of gypsum-binder in the investment:** A. Setting and hydroscopic B. Strength and rigidity

Description : What is the function of gypsum-binder in the investment:** A. Setting and hydroscopic B. Strength and rigidity

Last Answer : B. Strength and rigidity

Name the type of cement from the following for canal linings: (A) Sulphate resisting cement (B) Rapid hardening cement (C) Quick setting cement (D) Pozzolana cement

Description : Name the type of cement from the following for canal linings: (A) Sulphate resisting cement (B) Rapid hardening cement (C) Quick setting cement (D) Pozzolana cement

Last Answer : Answer: Option A

Which type of following cement is used for mass concrete work a) High Alumina cement b) Quick setting cement c) Rapid hardening cement d) Low heat cement*

Description : Which type of following cement is used for mass concrete work a) High Alumina cement b) Quick setting cement c) Rapid hardening cement d) Low heat cement*

Last Answer : d) Low heat cement*

Addition of pyrazinamide and ethambutol for the first two months to the isoniazid + rifampin therapy of tuberculosis serves the following purpose(s): A. Reduces the total duration of therapy to 6 months B. Produces more rapid sputum conversion C. Permits reduction of rifampin dose D. Both ‘A’ and ‘B’ are correct

Description : Addition of pyrazinamide and ethambutol for the first two months to the isoniazid + rifampin therapy of tuberculosis serves the following purpose(s): A. Reduces the total duration of therapy to 6 months B. ... sputum conversion C. Permits reduction of rifampin dose D. Both A' and B' are correct

Last Answer : D. Both ‘A’ and ‘B’ are correc