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Test: Cement, Mortar & Lime - 3 - Civil Engineering (CE) MCQ


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20 Questions MCQ Test Topicwise Question Bank for Civil Engineering - Test: Cement, Mortar & Lime - 3

Test: Cement, Mortar & Lime - 3 for Civil Engineering (CE) 2024 is part of Topicwise Question Bank for Civil Engineering preparation. The Test: Cement, Mortar & Lime - 3 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Cement, Mortar & Lime - 3 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Cement, Mortar & Lime - 3 below.
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Test: Cement, Mortar & Lime - 3 - Question 1

Surkhi is added to lime mortar to

Test: Cement, Mortar & Lime - 3 - Question 2

Increase in fineness of cement

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 2

The fineness of cement is a measure of the size of particles of cement and is expressed in terms of specific surface of cement.
For a given weight of cement, the surface area is more for finer cement than for coarser cement. The finer the cement, the higher is the rate of hydration, as more surface area is available for chemical reaction. This results in the early development of strength.

Test: Cement, Mortar & Lime - 3 - Question 3

Consider the following statements:
The effect of air entrainment in concrete is to
1. increase resistance to freezing and thawing
2. improve workability
3. decrease strength
Which of these statements are correct?

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 3

Air entrainment will reduce damage during freeze- thaw cycles thereby increasing the concrete’s durability. Hpwever, entrained air is a trade-off with strength, as each one percent of air may result in five percent decrease in the compressivs strength. The compounds used for air-entrainment are a number ofaetural wood resins, various sulphonated compounds, and some animal and vegetable fats and oils such as tallow, olive oil and their fatty acids such as stearic and oleic acids.

Test: Cement, Mortar & Lime - 3 - Question 4

Match List-I (Property of cement) with List-ll (Testing apparatus) and select the correct answer using the codes give below the lists:

Codes:

Test: Cement, Mortar & Lime - 3 - Question 5

Consider the following statements: High early strength of cement is obtained as a result of
1. fine grinding
2. decreasing the lime content
3. burning at higher temperatures
4. increasing the quantity of gypsum
Which of these statements are correct

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 5

On increasing fineness setting time decreases. So early gain of strength with decrease in lime content quick setting takes place.
On increasing Gypsum Initial setting time increases.

Test: Cement, Mortar & Lime - 3 - Question 6

Match List-I with List-ll and select the correct answer using the codes given below the lists:

Codes:

Test: Cement, Mortar & Lime - 3 - Question 7

Match List-I (Type of cement) with List-II (Property/characteristics) and select the correct answer using the codes given below the lists:

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 7

Explanation:

1. High-strength Portland cement:

 This cement is produced by a special technique called Macro Defect Free (MDF) innovation. In this process 4-7% of one of several water-soluble polymers (such as hydroxypropyl methylcellulose, polyacrylamide of hydrolyzed polyvinyl acetate are added to generate high strength.

C3S gives high-strength Portland cement

2. Super sulfated cement is resistant to sulfate attack and also to chemical attack.

3. High Alumina cement cannot be used with admixtures

4. Rapid Hardening cement gives a higher rate of heat development due to an increased rate of reaction.

Test: Cement, Mortar & Lime - 3 - Question 8

Match List-I (Apparatus) with List-ll (Purpose) and select the correct answer using the code given below the lists:

Codes:

Test: Cement, Mortar & Lime - 3 - Question 9

Match List-I (Type of Cement) with List-ll (Characteristics) and select the correct answer using the code given below the lists:

Codes:

Test: Cement, Mortar & Lime - 3 - Question 10

Consider the following statements: Low percentage of C3S and high percentage of C2S in cement will result in
1. higher ultimate strength with less heat generation
2. rapid-hardening
3. better resistance to chemical attack
Which of these statements are correct?

Test: Cement, Mortar & Lime - 3 - Question 11

Consider the following statements:
"When cement is tested /for setting time; on gauging it shows quick setting. This phenomenon known as "Flash set" of cement is due to the presence of high 
1. Tricalcium Aluminate (C3A) in cement
2. Alkalies in cement .
3. Tricalcium Silicate (C3S) in cement.
Which of these statements are correct?

Test: Cement, Mortar & Lime - 3 - Question 12

Match List-I (Cement) with List-lI (Characteristic) and select the correct answer using the codes given below the lists:

Codes:

Test: Cement, Mortar & Lime - 3 - Question 13

Consider the following statements:
1. Addition of a small quantity of slaked lime to Portland cement in cement mortar increases the plasticity of the mortar.
2. Light weight mortar is prepared by mixing cement and finely crushed fire bricks with water,
3. Fire resistant mortar is prepared by mixing aluminous cement and finely ground china clay wares with water.
Which of these statements are correct?

Test: Cement, Mortar & Lime - 3 - Question 14

Lime mortar is generally made with

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 14

Lime used for mortar may be fat lime (quick or hydrated lime) or hydraulic lime. Slaked fat lime is used to prepare mortar for plastering, while hydraulic lime is used in preparing mortar for masonry construction.

Test: Cement, Mortar & Lime - 3 - Question 15

The temperature range in a cement kiln is

Test: Cement, Mortar & Lime - 3 - Question 16

Which type of following cement is used for mass concrete work 

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 16

Low-heat Portland Cement: This cement is less reactive than OPC and is obtained by increasing the proportion of C2S and reducing that of C3S and C3A  this is achieved by restricting the amount of calcium and increasing that of silicates in the raw material for manufacture. This reduction in the contents of more rapidly hydrating compounds C3S and C3A results in a slow development of strength but the ultimate strength is the same. The initial setting time is about one hour, i.e., greater than that of OPC, and final setting time is about 0 hours. This cement is recommended for the use in mass concrete construction such as retaining walls, bridge piers and abutments, dams, etc., where temperature rise by heat of hydration can become excessive.

Test: Cement, Mortar & Lime - 3 - Question 17

Low heat cement contains lower percentage of which of the following

Test: Cement, Mortar & Lime - 3 - Question 18

Specific surface of portland cement should not be less than

Test: Cement, Mortar & Lime - 3 - Question 19

Loss on ignition in portland cement shall not be more than

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 19

The loss on ignition test is carried on portland cement to determine the loss of weight when the sample is heated to 900-1000°C. The loss is weight occurs as the moisture and carbon dioxide which are present is combination with free lime or magnesia evaporate.
The loss on ignition is determined by heating one gram of cement sample is a platinum crucible at a temperature of 900°C-1000°C for minimum of 15 minutes. Normally, the loss, will be in the neighbourhood of two percent.
Maximum allowable loss is four percent.

Test: Cement, Mortar & Lime - 3 - Question 20

Which of the following is correct if they are arranged in decreasing order of heat of hydration

Detailed Solution for Test: Cement, Mortar & Lime - 3 - Question 20

Heat of hydration is the heat generated when cement reacts with water during the setting process. The compounds mentioned, C3A (tricalcium aluminate), C4AF (tetracalcium aluminoferrite), C3S (tricalcium silicate), and C2S (dicalcium silicate), are the four main components of Portland cement.

The heat of hydration follows the general order:

  1. C3A - Tricalcium aluminate has the highest heat of hydration.
  2. C3S - Tricalcium silicate follows with a significant heat of hydration but less than C3A.
  3. C4AF - Tetracalcium aluminoferrite has less heat of hydration than C3S.
  4. C2S - Dicalcium silicate has the least heat of hydration.

Based on this, the correct order in decreasing heat of hydration is:

C3A > C3S > C4AF > C2S

So, the correct option is: C3A > C3S > C4AF > C2S

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