Description : Which of the following ingredients of the brick earth enables the brick to retain its shape? (A) Alumina (B) Silica (C) Iron (D) Magnesia
Last Answer : Answer: Option B
Description : Which of the following constituents impart plasticity to brick earth a) Alumina* b) Silica c) Lime d) Magnesia
Last Answer : a) Alumina*
Description : The main ingredients of Portland cement are a) Lime and silica* b) Lime and Alumina c) Alumina magnesia d) Silica and Alumina
Last Answer : a) Lime and silica*
Description : The main ingredient of a good quality brick earth, is (A) Magnesia (B) Lime (C) Silica (D) Alumina
Last Answer : Answer: Option D
Description : Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following: (A) Alumina (B) Lime (C) Iron-oxide (D) Magnesia
Last Answer : Answer: Option A
Description : Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth? (A) Lime stone and alumina (B) Silica and alkalies (C) Alumina and iron (D) Alkalies and magnesium
Description : . Which of the following is used as a catalyst in fluidised bed catalytic cracking? (A) Silica-magnesia (B) Silica-alumina (C) Bentonite clays (D) All (A), (B) and (C
Last Answer : (D) All (A), (B) and (C
Description : Rotary kilns in cement industry are lined with _________bricks. (A) Fireclay (B) Silica (C) Lead (D) High alumina & high magnesia
Last Answer : (D) High alumina & high magnesia
Description : The refractory lining of the bottom in a basic electric arc furnace is made of (A) Silica (B) Alumina (C) Magnesia (D) Fireclay
Last Answer : Option C
Description : Pick up the correct proportions of chemical ingredients of cement (A) Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3 (B) Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 (C) Alumina : Silica : ... oxide : 63 : 22 : 6 : 3 (D) Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3
Description : The main ingredients of Portland cement are (A) Lime and silica (B) Lime and alumina (C) Silica and alumina (D) Lime and iron
Description : A good brick earth should contain: (A) About 20% to 30% of alumina (B) About 50% to 60% of silica (C) Not more than 5% of lime (D) All the above
Description : Which of the following if present in iron ore, enhances its value? (A) Alumina (B) Alkali oxide (C) Lime & Magnesia (D) None of these
Last Answer : C) Lime & Magnesia
Description : Identify the type of soil on the basis of the given characteristics - 1. They are rich in lime, iron, magnesia and alumina. 2. They are generally clayey, deep and impermeable. 3. They are mainly found ... the given alternatives - a. Laterite soil b. Red and yellow soil c. Saline soil d. Black soil
Last Answer : d. Black soil
Description : Chief constituent of ordinary Portland cement is [ A ] Lime [ B ] Alumina [ C ] Magnesia [ D ] Iron oxide
Last Answer : [ A ] Lime
Description : Soundness test of cement is done to determine its a) Durability in seawater b) Free lime content* c) Iron oxide content d) Alumina content
Last Answer : b) Free lime content*
Description : Wing walls and return walls are provided to retain a) earth on approaches b) ballast c) track on approaches d) none
Last Answer : a) earth on approaches
Description : Surface preparation for Metallising the abrasives used for final cleaning is a) Chilled iron grit G.24, as defined in BS : 2451 b) Washed salt free angular silica sand of mesh size 12 to 30 with a minimum of 40% retained on a 20 mesh c) either (a) or (b) * d) d) neither (a) or (b)
Last Answer : c) either (a) or (b) *
Description : Which one of the following impurity is not desirable in the soil used for brick formation a) Alkali b) Kankar c) Iron oxide d) Alkali & Kankar*
Last Answer : d) Alkali & Kankar*
Description : A pug mill is used for a) Softening brick earth b) Moulding brick earth c) Tempering brick earth* d) Compacting brick earth
Last Answer : c) Tempering brick earth*
Description : Which of the following is an adsorbent used for the removal of SO2 from gas/air? (A) Bog iron (B) Limestone powder or alkalised alumina (C) Silica gel (D) Active carbon
Last Answer : (B) Limestone powder or alkalised alumina
Description : Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is (A) 5CaO. 3 Al2O3 (B) 3CaO. Al2O3 (C) 3CaO. SiO2 (D) 2CaO. SiO2
Last Answer : Option A
Description : Efflorescence in cement is caused due to an excess of (A) Alumina (B) Iron oxide (C) Silica (D) Alkalis
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All the above
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All these
Description : Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly. (a) Lime (b) Silica (c) Alumina (d) Iron oxide
Last Answer : Lime is a common ingredient in cement. It is typically added in small amounts to help the cement set more quickly. Adding too much lime can cause the cement to set slowly. Alumina, silica, and iron oxide are also common ingredients in cement, but they do not have an effect on the setting time.
Description : The proportion of lime, silica, alumina and iron oxide in a Portland cement is (a) 63:22:6:3 (b) 63:22:3:6 (c) 22:63:6:3 (d) All the above
Last Answer : (a) 63:22:6:3
Description : The maximum percentage of chemical ingredient of cement is (a) Alumina (b) Iron oxide (c) Lime (d) Silica
Last Answer : (c) Lime
Description : Efflorescence in cement is caused due to an excess of [ A ] Alkalies [ B ] Silica [ C ] Iron oxide [ D ] Alumina
Last Answer : [ A ] Alkalies
Description : White cement contains less amount of ___________ [ A ] Lime [ B ] Silica [ C ] Alumina [ D ] Iron oxide
Last Answer : [ D ] Iron oxide
Description : _________ is the hardest oxide and is hence used where high wear resistance at high temperature is required. (A) Beryllium (B) Zirconia (C) Alumina (D) Magnesia
Last Answer : (C) Alumina
Description : Which of the following adsorbent is used to decolourise yellow glycerine? (A) Silica gel (B) Alumina (C) Fuller's earth (D) Activated carbon
Last Answer : (D) Activated carbon
Description : Which type of following cement is used for mass concrete work a) High Alumina cement b) Quick setting cement c) Rapid hardening cement d) Low heat cement*
Last Answer : d) Low heat cement*
Description : The percentage of alumina in a good brick earth lies between (A) 5 to 10 % (B) 20 to 30 % (C) 50 to 60 % (D) 70 to 80 %
Description : The main function of alumina in brick earth is (A) To impart plasticity (B) To make the brick durable (C) To prevent shrinkage (D) To make the brick impermeable
Description : Excess of alumina in brick earth makes the brick (A) Impermeable (B) Brittle and weak (C) To lose cohesion (D) To crack and warp on drying
Description : The constituent of cement which act as Binders are a) Sand and silica b) Silica and carbon c) tricalcium silicate dicalcium silicate and carbon d) tricalcium aluminate,dicalcium silicate and tricalcium silicate *
Last Answer : d) tricalcium aluminate,dicalcium silicate and tricalcium silicate *
Description : Excess of silica in brick earth results in (A) Cracking and warping of bricks (B) Loss of cohesion (C) Enhancing the impermeability of bricks (D) None of the above
Description : Percentage of silica in a good brick earth lies between (A) 5 to 10 % (B) 20 to 30 % (C) 50 to 60 % (D) 70 to 80
Last Answer : Answer: Option C
Description : The Frog of a brick is normally made on its a) Top face* b) Bottom face c) Longer face d) Shorter side
Last Answer : a) Top face*
Description : Number of bricks required for 1 cubic meter of brick masonry is a)400 b) 450 c) 500* d) 550
Last Answer : c) 500*
Description : The depth of frog in a brick is a) 15 mm b) 10 mm c) 6. 25 mm* d) 3 mm
Last Answer : c) 6. 25 mm*
Description : ormal size of brick used in India is a) 22 x 11.2 x 7 cm* b) 25 x 16 x 8 cm c) 19 x 12 x 9 cm d) 20 x 10 x 5 cm
Last Answer : a) 22 x 11.2 x 7 cm*
Description : If first class Brick is immersed in water for 24 hours it should not absorb water by weight more than a) 10% b) 15% c) 20% * d) 25%
Last Answer : c) 20% *
Description : he minimum compressive strength of first class brick should be a) 75 kg per centimeter square b) 90 kg per centimeter square c) 100 kg per centimeter square* d) 120 kg per centimeter square
Last Answer : c) 100 kg per centimeter square*
Description : Life of Portion mainly depend upon? (i) Quality of packing (ii) Storage condition (iii) Quality of packing and storage condition.* (iv) Ingredients of portions
Last Answer : (iii) Quality of packing and storage condition.*
Description : What is the use of biochar in farming? 1. Biochar can be used as a part of the growing medium in vertical farming. 2. When biochar is a part of the growing medium, it promotes the growth of nitrogen fixing microorganisms. 3. ... are correct? a) 1 and 2 only b) 2 only c) 1 and 3 only d) 1, 2 and 3
Last Answer : d) 1, 2 and 3
Description : Pick up the correct statement from the following: (A) The lime in excess makes the cement unsound and causes the cement to expand and disintegrate (B) The silica in excess makes the cement stronger ... time also increases (C) The excess amount of alumina weakens the cement (D) All the above
Description : Slate (A) Is a metamorphic rock (B) Splits into thin sheets along its bedding planes (C) Has a smooth surface and contains alumina and silica (D) Possesses good water absorption capacity
Description : Which of the following is an absorbent? A.silica gel B. activated alumina C. both of the mentioned D. none of the mentioned
Last Answer : ANSWER : C