Test 22 - Selection of Cement for Engineering Applications

Question 1 ప్రశ్న 1

A large gravity-concrete block is to be constructed where internal temperature rise and subsequent thermal cracking are the dominant cement-related concerns. Very early strength is not important. Which cement is most directly formulated for this requirement?

A Rapid Hardening Portland Cement B Low Heat Portland Cement C White Portland Cement D Hydrophobic Portland Cement

Question 2 ప్రశ్న 2

A precast plant wants to shorten its production cycle by obtaining high early concrete strength for earlier demoulding and handling. Which cement is the most directly relevant special cement, assuming the mix and curing are properly designed?

A Masonry Cement B Low Heat Portland Cement C Rapid Hardening Portland Cement D Hydrophobic Portland Cement

Question 3 ప్రశ్న 3

A foundation will be exposed to severe sulphate-bearing groundwater, and the project specification specifically requires a Portland cement having restricted tricalcium aluminate content. Which cement best satisfies that requirement?

A Sulphate Resisting Portland Cement B White Portland Cement C Hydrophobic Portland Cement D Rapid Hardening Portland Cement

Question 4 ప్రశ్న 4

A reinforced-concrete marine substructure is exposed to chlorides, sulphates and repeated wetting. Adequate curing can be provided and early strength is not the controlling requirement. Which choice is particularly reasonable among the following?

A OPC 53 selected solely because 53 is the highest ordinary grade B Hydrophobic Portland Cement solely because the concrete will contact water C Masonry Cement because it has good workability D Compliant Portland Slag Cement with an appropriately designed low-permeability concrete mix

Question 5 ప్రశ్న 5

Cement must be transported to a remote project and may remain stored for an extended period under humid conditions before use. Which special cement directly addresses resistance of the stored cement powder to atmospheric moisture?

A Low Heat Portland Cement B Hydrophobic Portland Cement C Sulphate Resisting Portland Cement D White Portland Cement

Question 6 ప్రశ్న 6

An architect requires a highly finished white terrazzo and decorative precast surface where colour uniformity is a primary material-selection requirement. Which cement is the most appropriate starting choice?

A White Portland Cement B Low Heat Portland Cement C Sulphate Resisting Portland Cement D Supersulphated Cement

Question 7 ప్రశ్న 7

A non-structural brick masonry and plastering project places high importance on mortar workability, cohesion and water retention rather than high structural concrete strength. Which cement is most directly intended for this type of work?

A Rapid Hardening Portland Cement B OPC 53 solely because it has a high grade number C Masonry Cement D Low Heat Portland Cement

Question 8 ప్రశ్న 8

A damaged concrete pavement must be repaired rapidly and reopened after the required early concrete strength is achieved. Thermal effects from a massive section are not significant. Which cement type is most directly suited to the stated priority?

A Masonry Cement B Low Heat Portland Cement C White Portland Cement D Rapid Hardening Portland Cement

Question 9 ప్రశ్న 9

An engineer states that M40 concrete must necessarily be made with OPC 43 or OPC 53 because the cement grade number must equal or exceed the concrete grade number. Which response is correct?

A The statement is correct because cement and concrete grades use the same grading system. B The statement is incorrect because cement grade is based on standard mortar strength, whereas concrete grade is achieved through concrete mix design and performance. C Only OPC 33 can be used for M40 concrete. D Concrete grade depends only on the initial setting time of cement.

Question 10 ప్రశ్న 10

A contractor proposes OPC 33 for mass concrete solely because its grade number is lower than OPC 53 and therefore assumes it must generate less heat. What is the correct engineering response?

A The reasoning is invalid because OPC strength grade is not itself a heat-of-hydration classification; heat performance should be evaluated directly and an appropriate low-heat or blended system selected where required. B The reasoning is always correct because cement grade number directly gives heat of hydration. C OPC 53 always produces exactly 53 percent more heat than OPC 33. D Heat evolution is independent of cement composition and fineness.

Question 11 ప్రశ్న 11

A contractor wants to strip formwork early simply because OPC 53 has been used. Which statement is most appropriate?

A Formwork may always be removed immediately after final setting when OPC 53 is used. B The grade marking alone determines the exact stripping time. C A cement capable of higher early strength may help, but formwork removal must be based on the required concrete strength, member conditions, curing and applicable construction requirements. D OPC 53 prevents all early-age cracking and therefore makes formwork unnecessary.

Question 12 ప్రశ్న 12

Concrete will be exposed continuously to a strongly acidic industrial liquid. Which cement-selection statement is most defensible?

A OPC 53 automatically makes the concrete acid-proof. B Hydrophobic cement guarantees complete acid resistance. C White Portland Cement is inherently immune to strong acids. D Cement type alone may not provide adequate resistance to strong acid exposure; material selection, protective systems and exposure-specific design must be considered.

Question 13 ప్రశ్న 13

Why is prolonged and effective curing particularly important when PPC or PSC is selected partly for long-term durability benefits?

A Because supplementary pozzolanic or slag-related reactions require continued moisture to develop the intended microstructure and performance. B Because curing prevents all hydration of Portland cement. C Because blended cements achieve their full properties immediately after mixing. D Because curing changes the cement into an aggregate.

Question 14 ప్రశ్న 14

A prestressed-concrete production facility requires comparatively high early strength and strict control of chloride content because of prestressing steel. Which selection principle is most appropriate?

A Select a compliant cement capable of the required early strength and satisfying the applicable stricter chloride requirement for prestressed construction, then verify performance by concrete trials. B Select any cement having the highest sulphate content. C Use Masonry Cement because high water retention is the primary prestressing requirement. D Ignore cement chloride content because prestressing steel is not susceptible to corrosion.

Question 15 ప్రశ్న 15

A contractor claims that Hydrophobic Portland Cement should be selected for a basement because its name proves that the hardened concrete will be waterproof. Which response is correct?

A The claim is correct because hydrophobic cement makes all hardened concrete impermeable. B The claim is correct provided OPC grade is at least 43. C The claim is incorrect because hydrophobic treatment primarily improves cement storage resistance; basement watertightness still depends on concrete quality, joints, cracks and waterproofing design. D Hydrophobic cement cannot hydrate in a basement.

Question 16 ప్రశ్న 16

Concrete must be transported for a relatively long period in hot weather before placement. Which cement-related consideration is most important?

A Select the whitest cement because colour controls workability retention. B Ensure that the selected cement and concrete system provide adequate working and setting time under the expected temperature, while using appropriate temperature and admixture controls where necessary. C Select Rapid Hardening Portland Cement solely because the word 'rapid' guarantees longer working time. D Use Masonry Cement in reinforced concrete because mortar water retention prevents all slump loss.

Question 17 ప్రశ్న 17

A project is located in severe sulphate-bearing soil where the prevailing temperature may frequently exceed 40°C. The designer is considering Sulphate Resisting Portland Cement and Supersulphated Cement. Which statement is most appropriate?

A Supersulphated Cement must always be selected regardless of temperature. B Temperature has no relevance to Supersulphated Cement. C Ordinary White Portland Cement is automatically superior in sulphate exposure. D Sulphate Resisting Portland Cement may be the more straightforward option where the specification is satisfied, because use of Supersulphated Cement requires attention to its temperature-related limitations.

Question 18 ప్రశ్న 18

A sewage-treatment structure will experience wet service, sulphate-bearing wastewater and possible chloride exposure. Long-term permeability control is important and adequate curing can be ensured. Which option is particularly reasonable?

A A compliant Portland Slag Cement concrete designed for the actual exposure and low permeability B Masonry Cement because sewage structures are made of masonry C White Portland Cement because light colour improves chemical resistance D Hydrophobic Portland Cement solely because the structure contains water

Question 19 ప్రశ్న 19

An ordinary reinforced-concrete building has no unusual chemical exposure, no mass-concrete thermal problem and no exceptionally rapid construction requirement. Which cement-selection approach is most appropriate?

A OPC 53 must always be used because it is the numerically highest grade. B PPC must always be used because blended cement is universally superior. C Select any compliant cement permitted by the project specification whose concrete mix satisfies the required strength, durability, workability and construction schedule. D Only Rapid Hardening Portland Cement can be used in reinforced concrete.

Question 20 ప్రశ్న 20

A contractor proposes replacing the specified OPC with PPC without carrying out trials, while keeping an unusually early formwork-removal schedule unchanged. What is the most appropriate response?

A Approve automatically because PPC and OPC always have identical early strength at every age. B Reject PPC permanently because it cannot be used structurally. C Permit the change solely if the cement bags have the same colour. D Reassess the concrete mixture and verify early-age strength and construction performance before retaining the same stripping schedule.

Question 21 ప్రశ్న 21

A cement is proposed for a massive foundation specifically because it conforms to Low Heat Portland Cement requirements. Its measured heats of hydration are 270 kJ/kg at 7 days and 310 kJ/kg at 28 days. If the applicable maxima are 272 and 314 kJ/kg, which conclusion is correct on the stated heat requirement?

A It complies with both stated heat-of-hydration limits. B It fails the 7-day requirement. C It fails the 28-day requirement. D It can be accepted only if its 28-day strength is exactly 53 MPa.

Question 22 ప్రశ్న 22

Two compliant cements are being considered for fast precast production. Cement X has verified higher one-day concrete strength in the proposed mix, while Cement Y develops similar 28-day strength but substantially lower early strength. If early demoulding is the governing requirement and durability is otherwise satisfactory, which is the more rational choice?

A Cement X, because verified early concrete strength directly supports the stated production requirement B Cement Y, because 28-day strength always controls formwork removal C Either cement must allow identical demoulding time D Select solely by cement colour

Question 23 ప్రశ్న 23

A high-strength concrete project specifies a target concrete grade substantially above 53 MPa. Which statement about cement selection is most appropriate?

A Such concrete is impossible because OPC grades stop at 53. B The cement grade number does not impose an identical numerical ceiling on concrete strength; suitable cement, low water-binder ratio, supplementary materials, admixtures and mix design can produce higher concrete strengths. C Only Masonry Cement may be used above 53 MPa. D Concrete strength above 53 MPa requires cement with an initial setting time above 53 minutes.

Question 24 ప్రశ్న 24

Match each project condition with the most directly relevant cement-selection response:
1. Massive dam block with thermal-cracking concern
2. Severe sulphate-bearing groundwater requiring low-C3A Portland cement
3. Prolonged humid storage of bagged cement
4. Architectural white terrazzo

P. White Portland Cement
Q. Hydrophobic Portland Cement
R. Low Heat Portland Cement
S. Sulphate Resisting Portland Cement

A 1-S, 2-R, 3-P, 4-Q B 1-R, 2-S, 3-Q, 4-P C 1-Q, 2-P, 3-R, 4-S D 1-P, 2-Q, 3-S, 4-R

Question 25 ప్రశ్న 25

Consider the following statements about engineering selection of cement:
1. Cement should be selected from the complete combination of strength development, exposure, heat, setting, durability and construction requirements.
2. A higher OPC grade is not automatically superior for every project.
3. Blended cements can provide durability or heat-development advantages in suitable applications, but proper curing and mix design remain important.
4. A special cement name by itself guarantees acceptable concrete even when water-cement ratio, compaction and curing are poor.

Which statements are correct?

A 1 and 2 only B 2, 3 and 4 only C 1, 3 and 4 only D 1, 2 and 3 only

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