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.
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
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
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
Description : 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
Last Answer : preventing rapid setting of cement
Description : 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
Last Answer : (A) Gypsum
Description : Setting time of cement increases by adding (A) Gypsum (B) Hydrogen peroxide (C) Calcium chloride (D) Sodium oxide
Last Answer : Answer: Option A
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
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
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
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
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
Description : Batching refers to (A) Controlling the total quantity at each batch (B) Weighing accurately, the quantity of each material for a job before mixing (C) Controlling the quantity of each material ... be added in each batch according to the moisture content of the materials being mixed in the batch
Last Answer : (C) Controlling the quantity of each material into each batch
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.
Description : Plaster of Paris is (A) CaSO4 .½H2O (B) Used for setting of broken bones (C) Both (A) and (B) (D) Same as gypsum
Last Answer : (C) Both (A) and (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
Description : A slow setting cement will have higher percentage of a) tricalcium aluminate b) tricalcium silicate c) Gypsum d) Dicalcium silicate*
Last Answer : C2s
Description : The Most common admixture used to accelerate the initial setting of concrete is a) Gypsum b) Calcium chloride* c) Calcium carbonate d) Calcium bicarbonate
Last Answer : b) Calcium chloride*
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.
Description : If is the percentage of water required for normal consistency, water to be added for determination of initial setting time, is (A) 0.70 P (B) 0.75 P (C) 0.80 P (D) 0.85 p
Last Answer : Answer: Option D
Description : If ‘W’ is the percentage of water required for normal consistency of cement, water to be added for determination of initial setting time is (a) 0.50 W (b) 0.62 W (c) 0.75 W (d) 0.85 W
Last Answer : (d) 0.85 W
Description : Fly ash when added to concrete [ A ] Acts as aggregates [ B ] Acts as pozzolona [ C ] Improves appearance [ D ] Reduces setting time
Last Answer : [ B ] Acts as pozzolona
Description : Soil colour determination is standardized and determined by the comparison of the soil colour to? a Tensiometer b Gypsum block c Munsell chart d None of the above
Last Answer : c Munsell chart
Description : Gypsum is added to the soil? (a) To increase the alkalinity (b) To decrease the acidity (c) To decrease the alkalinity (d) As an insecticide
Last Answer : Ans:(b)
Description : The three steps of project management are _____. a. controlling the project, directing the project, and creating the work plan b. creating the work plan, staffing the project, and controlling ... the deliverables e. setting the start date, estimating the time, and reading the actual time
Last Answer : b. creating the work plan, staffing the project, and controlling and directing the project
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
Description : The impurity of mixing water which affects the setting time and strength of concrete, is (A) Sodium sulphates (B) Sodium chlorides (C) Sodium carbonates and bicarbonates (D) Calcium bicarbonates
Description : Vicat apparatus is used for (A) Fineness test (B) Consistency test (C) Test for setting time (D) Test for tensile strength
Description : Pick up the correct statement regarding low heat cement from the following: (A) It possesses less compressive strength (B) Its initial setting time is about one hour (C) Its final setting time is about 10 hours (D) All the above
Description : Le-Chatelier's device is used for determining the (A) Setting time of cement (B) Soundness of cement (C) Tensile strength of cement (D) Compressive strength of cement
Description : The presence of lime in cement (a) Make s the cement sound and provides strength to the cement. (b) Prolong the setting time (c) Causes unsoundness in cement (d) All the above
Last Answer : (a) Make s the cement sound and provides strength to the cement.
Description : Which among the following is/are duty/ies of the sales manager ? 1. organizing sales research 2. setting and controlling the targets 3. advising the company on sales promotion 4. all of the above 5. none of these
Last Answer : all of the above
Description : 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
Description : Soundness test of cement determines (A) Quality of free lime (B) Ultimate strength (C) Durability (D) Initial setting
Description : Quick lime is (i) Slow in setting (ii) Rapid in slacking (iii) Good in strength The correct answer is (A) Only (i) (B) Only (ii) (C) Both (i) and (ii) (D) Both (ii) and (
Description : The deleterious materials present in the aggregate (a) Prevent normal hydration of cement (b) Reduce the strength and durability of concrete. (c) Modify the setting action and cause efloresecence. (d) All of the above
Last Answer : (d) All of the above
Description : In order to provide colour, hardness and strength to the cement, the ingredient used is (a) Lime (b) Solica (c) Alumina (d) Iron oxide
Last Answer : (d) Iron oxide
Description : Pick up the incorrect statement from the following. For performing compressive strength test of cement (A) Cement and standard sand mortar are used in the ratio of 1 : 3 (B) Water is added at the ... cm 10 cm is used (D) The prepared moulds are kept in a atmosphere of 50% relative humidity
Description : Pick up the correct statement from the following: (A) Catalysts are added to assist and accelerate the hardening of resin (B) The fillers are inert materials and they impart strength and hardness (C) Fibrous fillers increase thermal resistance (D) All the above
Description : If 30% excess water is added, the strength of concrete is reduced by (a) 30% (b) 40% (c) 50% (d) 60%
Last Answer : (c) 50%
Description : For determining the compressive strength test on cement is, the percentage amount of water to be added as (Pa = Percentage of water for required consistency) [ A ] 0.25 Pa + 2.5 [ B ] 0.25 Pa + 3.5 [ C ] 0.35 Pa + 2.5 [ D ] 0.35 Pa + 3.5
Last Answer : [ B ] 0.25 Pa + 3.5
Description : A major difference between light cured and chemical cured composite is that during setting or in function the light cured material tends to:******** VERY IMP A. Seal the margins better and ... on time C. Undergo greater colour change D. Shrink more rapidly E. Posses greater fracture toughness
Last Answer : D. Shrink more rapidly
Description : Determination of water content of a soil sample suspected to contain gypsum is made by drying the sample for longer period at a temperature not more than (A) 60°C (B) 80°C (C) 100°C (D) 110°C
Last Answer : (B) 80°C
Description : Pick up the correct statement from the following: (A) Calcium chloride acts as a retarder (B) Calcium chloride acts as an accelerator (C) Gypsum (calcium sulphate) acts as a retarder (D) Both (b) and (c)
Last Answer : (D) Both (b) and (c)
Description : Ordinary Portland cement is manufactured from (A) Lime stone and clay (B) Gypsum and lime (C) Pozzolana (D) Lime, pozzolana and clay
Description : The material generally not used as extender in paints, is (A) Powdered silica (B) Gypsum (C) Talc (D) Zinc white
Description : Which one of the following is an air binding material? (A) Gypsum (B) Acid-resistant cement (C) Quick lime (D) All of these
Description : Pick up the polymineralic rock from the following: (A) Quartz sand (B) Pure gypsum (C) Magnesite (D) Granite
Description : Pick up the rock which is not a sedimentary rock from the following: (A) Gravel (B) Sand stone (C) Gypsum (D) Dolerite
Description : Plaster of Paris is obtained by calcining (A) Bauxite (B) Gypsum (C) Lime stone (D) None of these