MTR 241 Test 2 version 1 2016

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Seneca College *

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241

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Mathematics

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Jun 13, 2024

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pdf

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1 SENECA COLLEGE OF APPLIED ARTS AND TECHNOLOGY Student’s Full Name: ___________________________________________ MTR 241 T EST #2 – VERSION 1 PROFESSOR: Nahgeib Miller DATE : March, 2016 DURATION: 90 minutes MARKS: 50 marks INSTRUCTIONS 1. The test paper consists of 14 pages (including this one) 2. You may use non-programmable scientific calculators, rulers and black or blue pen or pencil only. Write legibly and neatly. 3. In sections 2 & 3; a logical, step-wise and clear process must be demonstrated for full marks. 4. Please show all your work in the space provided. Use the back of this page for scrap paper. 5. Section 1 has 20 questions, Section 2 has 1 question and Section 3 has 1 question. Answer ALL questions. Seneca Academic Policy on Cheating and Plagiarism (Sections 9.1 - 9.3): Cheating and plagiarism are offenses that will not be tolerated by the College. Such offenses occur when a student misrepresents his or her performance on any form of academic evaluation including, but not limited to, written assignments, lab experiments, group projects, tests or examinations . The penalty for a first offence of cheating or plagiarism is a grade "0" on the work in which the offense occurred and will result in a comment being placed on the transcript by the Academic Honesty Committee. The penalty for the second offence of cheating or plagiarism is an "F" in the course where the offence occurred, a second comment on the transcript and suspension from the College for a time period determined by the Academic Honesty Committee. When a student returns to the College, he/she will be placed on Academic Honesty Probation. If a further violation of the Academic Honesty policy occurs, the student will be withdrawn immediately from the College and will not be eligible for reinstatement.
2         1. What is portland cement concrete? a. Any material used in construction. b. All materials mixed with portland cement. c. A man-made rock of portland cement, aggregates and water. d. A granular material used in construction. 2. What is the main ingrediaent that makes up most of portland cement? a. Lime. b. Alumina. c. Silica. d. Iron Oxide . 3. Clinker is a mixture of which cement compounds .... a. Tricalcium aluminate, dicalcium aluminate, tricalcium aluminate and tetracalcium aluminoferrite b. Tricalcium silicate, dicalcium ferrite, tricalcium ferrite and tetracalcium aluminate c. Calcium silicate, silicate, calcium aluminate and calcium aluminoferrite d. Tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite 4. The amount of water required to complete hydration is approximately what percentage of the mass of the cement? a. 5% b. 10% c. 15% d. 25% 5. Which cementing compounds in portland cement are responsible for the earliest onset of strengthening in concrete? a. C 2 S; C 4 AF b. C 3 S; C 3 A c. CS; CA d. C 4 S; C 4 A
3 6. What is the heat of hydration? a. Heat required to fully hydrate the cement. b. The temperature the cement must be rasied to before it hardens. c. The heat given off by the hydration reaction between the water and the cementing compounds d. The temperature of the concrete after it has set. 7. Which of the following types of portland cement will have the highest proportion of C 3 S? a. Normal b. Moderate c. High Early Strength d. Low Heat of Hydration 8. Portland cement will set after water is added. What does the term "set" or "setting" mean? a. This is when the aggregates settle in the concrete. b. This is the time required for the cement to change from a plastic state to a solid state. c. This is the mass of cement required to create 1 cubic meter of concrete. d. This is the total anount of cement required to fill a standard cylinder. 9. What is the effect of increasing the proportion of water while mixing the concrete paste? a. Workability increases but the overall strength decreases. b. Strength increases but the workability decreases. c. Plasticity increases while the viscosity increaases. d. There is no effect. 10. What are air entrained concretes? a. These are concretes that increase their air content over time, after solidification. b. These are concretes that decrease air content over time, after solidification c. These are concretes that have an admixture that destroys small air pockets. d. These are concretes that have an admixture that creates small air pockets.
4 11. What is the effect of air entrainment on concrete? a. Decreases the workability. b. Increases strength. c. Reduces the amount of water required to achive a plastic state. d. Increases the overall mass. 12. What is meant by the durability of concrete? a. The ability of concrete to resist abrasion. b. The ability of concrete to increase in strength over time. c. This is the final strength of concrete after it hardens completely. d. The ability of concrete to resist disintegration. 13. The slump test is used to determine which physical property of the concrete mix? a. Workability b. Compressive strength c. Durability d. Soundness 14. Admixtures are used to improve the quality and performance of the concrete. What is the effect of adding water reducers to the concrete mix? a. Reduces the water required for a certain durability b. Reduces the water required for the hydration reaction. c. Increases the water required for a certain durability. d. Reduces the water required to achieve a certain workability. 15. Supplementary cementing materials (SCM) are used to improve the quality and reduce the cost of cement. How is this acieved? a. By replacing a portion of the portland cement in the concrete mix. b. By increasing the water content in the concrete mix. c. By decreasing the water content in the concrete mix. d. By replacing the water component of the concrete mix. 16. Pozzolan is a type of SCM. What is a benefit of using pozzolan in the concrete mix? a. Improves workability b. Reduces cost c. Improves resistance to sulphate attack d. All of these answers
5 17. Which of the following is a source of pozzolan SCM? a. Natural volcanic ash. b. Coal burning plants using anthracite. c. Coal burning plants using lignite. d. All of these answers 18. What is the effect of adding silica fume to portland cement? a. Significant gain in concrete strength. b. Reduces permeability. c. Reduces rebar corrosion. d. All of these answers 19. Which materials would reduce the strength and durability of concrete? a. Sound aggregates b. Materials finer than 0.08 mm. c. Hard and angular coarse aggregates. d. All of these answers 20. Why is a strength overdesign required for concrete mix design? a. Because engineering technologists usually make mistakes in calculating compressive strength. b. Because cost is not a factor in mix design. c. Because there is a variation in compressive strength test results. d. Because the durability depends on the strength.
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