Description : Calcination of limestone to produce lime is done in a __________ kiln. (A) Tunnel (B) Rotary (C) Vertical shaft (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : Calcination of limestone is not done in a __________ kiln for producing lime. (A) Vertical shaft (B) Rotary (C) Fluidised bed (D) Fixed bed
Last Answer : (D) Fixed bed
Description : Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3
Last Answer : (B) CO2 escapes continuously
Description : . Thermal efficiency of an internal combustion engine is around __________ percent. (A) 8 (B) 35 (C) 65 (D) 80
Last Answer : Option B
Description : Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent. (A) 20 (B) 40 (C) 60 (D) 80
Last Answer : (D) 80
Description : Rotary kilns are used in the (A) Calcination of limestone & dolomite (B) Cement manufacture (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : Thermal efficiency of an open hearth furnace may be about __________ percent. (A) 5 (B) 20 (C) 50 (D) 80
Last Answer : (B) 20
Description : Rotary kiln is not involved in the production of (A) Cement (B) Lime from limestone (C) Slaked lime from quick lime (D) None of these
Last Answer : (C) Slaked lime from quick lime
Description : Thermal efficiency of an internal combustion engine is around __________ percent. (A) 8 (B) 35 (C) 65
Description : Maximum thermal efficiency of boiler may be about __________ percent. (A) 10 (B) 25 (C) 65 (D) 90
Last Answer : (D) 90
Description : Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent. (A) 10-15 (B) 25-30 (C) 45-50 (D) 65-70
Last Answer : (B) 25-30
Description : The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent. (A) 50 (B) 65 (C) 85 (D) 99
Last Answer : (C) 85
Description : Iron content in Indian iron ore is about __________ percent. (A) 80-85 (B) 60-65 (C) 40-45 (D) 20-25
Last Answer : (B) 60-65
Description : Refractory bricks having high thermal conductivity is desirable, when it is to be used in the (A) L.D. converter (B) Blast furnace (C) Rotary kiln (D) Recuperator
Last Answer : (D) Recuperator
Description : The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent. (A) 15 (B) 40 (C) 70 (D) 85
Last Answer : (B) 40
Description : Reducing atmosphere is maintained in a (A) Calcination kiln (B) Blast furnace (C) Soaking pit (D) L.D. converter
Last Answer : (B) Blast furnace
Description : Which of the following is not a directly fired furnace? (A) By-product coke oven (B) Calcination kiln (C) Sintering furnace (D) Open hearth furnace
Last Answer : (A) By-product coke oven
Description : How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln? (A) 500°C (B) 750°C (C) 1000°C (D) 1500°C
Last Answer : (C) 1000°C
Description : In case of calcination of limestone, CaCO3 CaO + CO2 , the addition of more of CaO will result in __________ in the concentration of CO2 . (A) No change (B) Increase (C) Decrease (D) Unpredictable from the data
Last Answer : (A) No change
Description : Grinding efficiency of a ball mill is of the order of __________ percent. (A) 1-5 (B) 40-50 (C) 75-80 (D) 90-95
Last Answer : (A) 1-5
Description : Rotary lime kiln is an example of a/an __________ system. (A) Closed (B) Open (C) Isolated (D) Non-thermodynamic
Last Answer : (B) Open
Description : Equipment installation cost in a chemical process plant ranges from __________ percent of the purchased equipment cost. (A) 10 to 20 (B) 35 to 45 (C) 55 to 65 (D) 70 to 80
Last Answer : (B) 35 to 45
Description : Purchased cost of equipments for a chemical process plant ranges from __________ percent of the fixed capital investment. (A) 10 to 20 (B) 20 to 40 (C) 45 to 60 (D) 65 to 75
Last Answer : (B) 20 to 40
Description : Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent. (A) 80 and 97 (B) 95 and 100 (C) 40 and 70 (D) 25 and 97
Last Answer : (A) 80 and 97
Description : Which of the following is used for calcination of limestone and dolomite in industrial practice? (A) Fluidised bed reactor (B) Moving bed reactor (C) Fixed bed reactor (D) None of these
Last Answer : (B) Moving bed reactor
Description : Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent. (A) 7-14 and 14-30 (B) 7-14 and 40-50 (C) 14 - 30 and 40-50 (D) 10 - 20 and 40 - 50
Last Answer : (A) 7-14 and 14-30
Description : 150. Nitrogen content in ammonium sulphate (a fertiliser) is around __________ percent. (A) 5 (B) 20 (C) 50 (D) 65
Description : Large tonnage of refractory bricks are dried in a (A) Shaft furnace (B) Rotary hearth furnace (C) Tunnel kiln (D) Muffle furnace
Last Answer : (C) Tunnel kiln
Description : Which of the following is a heat treatment furnace? (A) Muffle furnace (B) Annealing furnace (C) Reheating furnace (D) Rotary kiln
Last Answer : (B) Annealing furnace
Description : Cement Kiln is a (A) Rotary Kiln (B) Tunnel Kiln (C) Natural draft furnace (D) Batch furnace
Last Answer : (A) Rotary Kiln
Description : Which of the following is a periodic furnace? (A) Tunnel kiln (B) Rotary kiln (C) Soaking pit (D) Reheating furnace
Last Answer : (C) Soaking pit
Description : Coal tar is used as a (A) Binding material for coal briquettes (B) Fuel in rotary kiln (C) Binder in making carbon electrodes (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Ringelmann chart No. 2 corresponds to __________ percent black smoke. (A) 10 (B) 20 (C) 40 (D) 80
Last Answer : (C) 40
Description : Carbon content in plain carbon steel is __________ percent. (A) 0.1 to 0.15 (B) 0.35 to 0.45 (C) 0.65 to 0.80 (D) 0.85 to 1.2
Last Answer : (B) 0.35 to 0.45
Description : A rotary system has a damping coefficient of 40 N-m-sec/rad. The damping torque at a velocity of 2 rad/s, will be A) 20 N-m B) 40 N-m C) 80 N-m D) 100 N-m
Last Answer : C) 80 N-m
Description : Pick up the correct statement from the following: (A) The heating of a material to redness in contact with air, is known as calcination (B) The property of lime by which it sets or hardens in ... (C) The product that remains after calcination of limestone, is called lime (D) All the above
Last Answer : Answer: Option D
Description : Abrasion index of blast furnace coke should be around __________ percent. (A) 20 (B) 35 (C) 55 (D) 80
Description : Which of the following furnaces will have maximum thermal efficiency? (A) Soaking pits (B) Walking beam reheating furnace (C) Boiler furnace (D) Rotary kilns
Last Answer : (C) Boiler furnace
Description : Sucrose content in cane sugar may be around __________ percent. (A) 50 (B) 70 (C) 95 (D) 80
Last Answer : (C) 95
Description : To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between (A) 1100° and 1200°C (B) 1200° and 1300°C (C) 1300° and 1400°C (D) 1400° and 1500°C
Last Answer : D
Description : In the manufacture of cement, the dry of wet mixtue of calcareous and argillaceous materials is burnt in a (a) A Rotary kiln (b) A Grinder (c) Country kiln (d) All the above
Last Answer : (a) A Rotary kiln
Description : Yield of elemental phosphorous from rock phosphate is about __________ percent. (A) 1-2 (B) 15-25 (C) 40-45 (D) 60-65
Last Answer : (B) 15-25
Description : Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent. (A) 4 (B) 96 (C) 20 (D) 40
Last Answer : (C) 20
Description : Yield of pitch from distillation of high temperature tar is around __________ percent. (A) 10 (B) 25 (C) 65 (D) 90
Last Answer : (C) 65
Description : A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height. (A) 10-15 (B) 30-40 (C) 70-80 (D) 90-100
Last Answer : (A) 10-15
Description : P2O5 content in superphosphate is about __________ percent. (A) 30-35 (B) 15-20 (C) 65-70 (D) 85-90
Last Answer : (B) 15-20
Description : Gasoline yield in catalytic reforming of naphtha may be about __________ percent by weight. (A) 85 (B) 65 (C) 50 (D) 98
Last Answer : (A) 85
Description : Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material). (A) 15 (B) 45 (C) 65 (D) 85
Last Answer : (D) 85
Description : Carbon content of pitch (residue of coal tar distillation) is around __________ percent. (A) 70 (B) 55 (C) 80 (D) 94
Last Answer : (D) 94
Description : On a test consisting of 500 questions, Dhivya answered 80% of the first 250 questions correctly. What percent of the other 250 questions does she need to answer correctly for her grade on the entire exam to be 60% ? a) 20 b) 60 c) 45 d) 80 e) 40
Last Answer : Answer: E 60% of 500 = 300 80% of 250 = 200 No. of correct answers in remaining 250 questions = 300 – 200 = 100 Percentage = 100 x 100/ 250 = 40%