Bihar SBTE Diploma Civil 5th SEM Dec 2019 Paper on Cement Technology
| Sr. No. | Questions with options |
| 1 | Portland cement sets in combination of water
(a) Chemically (b) Thermally (c) Hydraulically (d) None of these |
| 2 | Percentage of CaO in portland cement is in the range of
(a) 60 – 66% (b) 1 – 3% (c) 3 – 8% (d) 19 – 25% |
| 3 | Portland cement was patented and name in 1824 in England by
(a) Newton (b) J.C. Bose (c) Einstein (d) Joseph Aspdin |
| 4 | Cement clinker is made at a temperature of
(a) 1650 degree Celsius (b) 1400 degree Celsius (c) 1000 degree Celsius (d) 800 degree Celsius |
| 5 | Flash set of cement can be prevented by using
(a) Alumina (b) Magnestie (c) Gypsum (d) Dolomite |
| 6 | Plaster of Paris is made by using
(a) Dolomite (b) Felspar (c) Silica (d) Gypsum |
| 7 | The process used to make raw material usable in cement industry is
(a) Slaking (b) Calcinations (c) Drying (d) Beneficiation |
| 8 | In blast furnace cement the percentage of slag is
(a) 80% (b) 90% (c) 75% (d) 65% |
| 9 | Cement clinker is made in
(a) Blast furnace (b) Rotary kiln (c) Down draft kiln (d) Tunnel kiln |
| 10 | Unsoundness is created by
(a) Free MgO (b) Free SiO2 (c) Free Al2O3 (d) None of these |
| 11 | Clinker should contain calcium silicate phase
(a) 70 – 80% (b) 40 – 50% (c) 30 – 40% (d) 25- 35% |
| 12 | Supplementary raw material are
(a) Sand (b) Bauxite (c) Fe2O3 (d) All the above |
| 13 | Water content of feed stock in wet process is
(a) 25 – 40% (b) 17 – 22% (c) 10 – 15% (d) 1- 8% |
| 14 | Cyclone heat exchanger used in
(a) Wet process (b) Semi-wet process (c) Semi –dry process (d) Dry process |
| 15 | Hydrated lime is
(a) Ca(OH)2 (b) CaO (c) CaCO3 (d) None of these |
| 16 | Sulphate resisting cement contain C3A phase
(a) 1 – 5% (b) 25 – 30% (c) 30 – 35% (d) 50 – 60% |
| 17 | In high alumina cement, alumina content is
(a) 40 – 45% (b) 10 – 15% (c) 80 – 90% (d) 75 – 80% |
| 18 | Burning zone of rotary kiln lining done by
(a) Silica bricks (b) Fire clay bricks (c) Mag-Alumina bricks (d) None of these |
| Published On – 6th June 2022 | |
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