Description : The following compound has the property of early strength as well as ultimate strength [ A ] C3S [ B ] C2S [ C ] C3A [ D ] C4AF
Last Answer : [ A ] C3S
Description : Which of the following compounds is considered to be an undesirable compound for cement [ A ] C3S [ B ] C2S [ C ] C3A [ D ] C4AF
Last Answer : [ D ] C4AF
Description : Low heat cement contains more amount of __________ than that of ordinary Portland cement [ A ] C3S [ B ] C2S [ C ] C3A [ D ] None of the above
Last Answer : [ B ] C2S
Description : 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 ... ) Low percentage of C3S and high percentage of C2S contribute to slow hardening (D) All the above
Last Answer : Answer: Option D
Description : Which of the following compound is susceptible to be attached by alkalies and salts [ A ] C3S [ B ] C3S [ C ] C3A [ D ] C3AF
Last Answer : [ C ] C3A
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
Last Answer : Answer: Option B
Description : Di-calcium silicate (C2S) (A) Hydrates rapidly (B) Generates less heat of hydration (C) Hardens rapidly (D) Provides less ultimate strength to cement
Description : Pick up the incorrect statement from the following: (A) Tricalcium silicate (C3S) hydrates rapidly (B) Tricalcium silicate (C3S) generates more heat of hydration (C) Tricalcium silicate (C3S) develops early strength (D) Tricalcium silicate (C3S) has more resistance to sulphate attack
Description : Pick up the compound responsible for early strength of cement from the following: (A) Tetra-calcium alumino-ferrite (B) Tri-calcium silicate (C) Tri-calcium aluminate (D) Di-calcium silicate
Description : Tricalcium aluminate (C3A) [ A ] Hydrating less rapidly [ B ] Is a redundant compound [ C ] To be attacked by alkalies and salts [ D ] None of these
Last Answer : [ C ] To be attacked by alkalies and salts
Description : The high strength of rapid hardening cement at early stage, is due to its (A) Finer grinding (B) Burning at high temperature (C) Increased lime cement (D) Higher content of tricalcium
Last Answer : Answer: Option C
Description : Finer grinding of cement (A) Affects only the early development of strength (B) Affects only the ultimate strength (C) Both (A) and (B) (D) Does not affect the strength
Last Answer : Answer: Option A
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
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 : Rapid hardening cement is used (a) Where high early strength is desired (b) Where form work is to be removed as early as possible (c) For construction of road pavements. (d) All of the above
Last Answer : (d) All of the above
Description : High percentage of tricalcium silicate and low percentage of dicalcium silicate in cement results in. (a) Rapid hardening (b) High early strength (c) High heat of generation (d) All the above
Last Answer : (d) All the above
Description : Dicalcium silicate (C2S) [ A ] rates rapidly [ B ] Hardens rapidly [ C ] Generates less heat of hydration [ D ] Has less resistance to sulphate attack
Last Answer : [ C ] Generates less heat of hydration
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
Description : The condition not applicable to water cement ratio law, is (A) Internal moisture conditions on hydration continue till complete strength is gained (B) Concrete specimens may be tested at any temperature (C) Concrete specimens need be of same age (D) Concrete specimens need be of same size
Description : 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
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
Description : What is C4AF ?
Last Answer : Chemical composition of C4AF cement clinker: (Tricalcium aluminopherite) Ca4Al2Fe2O10 Shorthand form C4AF
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 : Which of the following statement(s) is/are correct concerning the immunoinflammatory response to shock? a. The anaphylactoxins, C3a and C5a, are products of activation of only the classical pathway ... effects d. Platelet-activating factor can be released by both circulating and fixed tissue cells
Last Answer : Answer: d Inflammatory mediators have recently been recognized as playing a significant role in the clinical manifestations and progression of shock and the development ... increased pulmonary vascular resistance, bronchoconstriction, peripheral vasodilatation, and increased vascular permeability
Description : Which of the following statements regarding the complement system are true? a. Complement activation yields products which are directly cytotoxic as well as products which act indirectly via activated ... and classical pathways converge proximal to generating the membrane attack complex (C5b-9)
Last Answer : Answer: a, d The complement system is composed of two different but linked sequences, the classic and alternative pathways. The pathways involve serum proteins that act to amplify the inflammatory-immune ... the C5 level proximal to generating the membrane attack complex (C5b-9) (Figure 6-3)
Description : For given workability the grading requiring the least amount of water is one that gives (A) Greatest surface area for the given cement and aggregates (B) Least surface area for the given cement ... weight for the given cement and aggregates (D) Greatest weight for the given cement and aggregates
Description : For maximum strength and durability minimum percentage of cement, by weight is (A) 15 % (B) 20 % (C) 25 % (D) 30 %
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
Description : Minimum number of 50 kg cement bags per cubic metre of concrete for a mix corresponding to crushing strength 280 kg/cm2 at 28 days, are (A) 5.0 (B) 6.5 (C) 7.0 (D) 7.5
Description : Pick up the incorrect statement from the following. If water cement ratio is (A) Increased, strength of concrete increases (B) Decreased, strength of concrete increases (C) Increased, strength of concrete is not affected (D) None of these
Description : Pick up the correct statement from the following: (A) Water enables chemical reaction to take place with cement (B) Water lubricates the mixture of gravel, sand and cement (C) Strength of concrete structure largely depends upon its workability (D) All the above
Last Answer : (D) All the above
Description : Strength of concrete increases with (A) Increase in water-cement ratio (B) Increase in fineness of cement (C) Decrease in curing time (D) Decrease in size of aggregate
Last Answer : (B) Increase in fineness of cement
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 : For a good concrete (A) Aggregates should be hard and durable (B) Water should be free from organic materials (C) Cement should be sufficient to produce the required strength (D) All the above
Description : 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
Description : Addition of pozzolana to cement (A) Decreases workability (B) Increases strength (C) Increases heat of hydration (D) None of these
Description : As compared to ordinary Portland cement, use of pozzolana cement (A) Reduces workability (B) Increases bleeding (C) Increases shrinkage (D) Increases strength
Description : C.R.R.I. charts are used to obtain a relationship between strength of concrete and (A) Water cement ratio (B) Workability (C) Grading of aggregate (D) Fineness modulus
Description : Workability of concrete mix with low water cement ratio is determined by (A) Tensile strength test (B) Slump test (C) Compaction factor test (D) Flexural strength test
Description : Pick up the correct statement from the following: (A) Lime in excess, causes the cement to expand and disintegrate (B) Silica in excess, causes the cement to set slowly (C) Alumina in excess, reduces the strength of the cement (D) All the above
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
Description : Pick up the correct statement from the following: (A) Water cement paste hardens due to hydration (B) During hardening cement binds the aggregates together (C) Cement provides strength, durability and water tightness to the concrete (D) All the above
Description : A concrete using an air entrained cement (A) Has strength less than 10% to 15% (B) Has more resistance to weathering (C) Is more plastic and workable (D) Is free from segregation and bleeding
Description : Pick up the incorrect statement from the following: (A) With passage of time, the strength of cement increases (B) With passage of time, the strength of cement decreases (C) After a ... of cement reduces to 50% (D) The concrete made with storage deteriorated cement, gains strength with time
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 : 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
Description : With storage, strength of cement (A) Increases (B) Decreases (C) Remains the same (D) None to these
Description : Asbestos cement (A) Is brittle (B) Warps due to changes in humidity (C) Strength is lowered when saturated by water (D) All of the above
Description : Soundness test of cement determines (A) Quality of free lime (B) Ultimate strength (C) Durability (D) Initial setting