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 periodic furnace? (A) Tunnel kiln (B) Rotary kiln (C) Soaking pit (D) Reheating furnace
Last Answer : (C) Soaking pit
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 : Which furnace employs natural draft? (A) Coke oven (B) Boiler (C) Rotary kilns (D) L.D. converter
Last Answer : (A) Coke oven
Description : Which of the following is a directly fired intermittent furnace? (A) Walking beam reheating furnace (B) Reverberatory furnace (C) Tower furnace (D) Tunnel kiln
Last Answer : (B) Reverberatory furnace
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 : 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 : 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 : 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 : An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace. (A) Walking beam (B) Shaft (C) Tunnel (D) Rotary hearth
Last Answer : (A) Walking beam
Description : Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. (A) 20 (B) 40 (C) 65 (D) 80
Last Answer : (B) 40
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 : 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 : 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 : Rotary lime kiln is an example of a/an __________ system. (A) Closed (B) Open (C) Isolated (D) Non-thermodynamic
Last Answer : (B) Open
Description : Pick up the correct statement from the following: (A) Bull's trench kiln a trench excavated in ground (B) Hoffman's kiln is constructed over ground (C) Tunnel Kiln is constructed as a tunnel (D) All the above
Last Answer : Answer: Option D
Description : The main advantage of forced draft over natural draft is that (A) Combustion of fuel is complete (B) Smaller height chimney can be used (C) Furnace control is easier (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : A refractory wall separating the stock and the source of heat is provided in a (A) Updraft kiln (B) Muffle furnace (C) Continuous furnace (D) None of these
Last Answer : (B) Muffle furnace
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 : For continuous drying of granular or crystalline material, the dryer used is the __________ dryer. (A) Tunnel (B) Tray (C) Rotary (D) None of these
Last Answer : (C) Rotary
Description : Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer. (A) Rotary (B) Vacuum (C) Tunnel (D) Tray
Last Answer : (A) Rotary
Description : Drying of refractory is normally carried out in a __________ dryer. (A) Open pan (B) Tray (C) Rotary vacuum (D) Truck/tunnel
Last Answer : (D) Truck/tunnel
Description : In a 100 TPD Sponge Iron plant, the sponge iron is fed to the Induction melting furnace, producing molten steel at 88% yield. The Energy consumption details are as follows: Coal Consumption : 130 ... molten steel (product). 3. Total Energy Consumption of Plant in Tons of Oil Equivalent (TOE )
Last Answer : a) Specific Energy Consumption of Induction Melting Furnace Molten Steel Production from the Induction melting furnace per day = 100 x 88/100 = 88 TPD Total Energy Consumption of the Plant = 82400 kWh ... mark c) Total Energy consumption of Plant in ToE = 655864000/107 = 65.586 ToE
Description : Which of the following employs an accessory known as 'drift eliminator'? (A) Multiple effect evaporator (B) Mechanical draft cooling tower (C) Rotary dryer (D) Rotating disc contacto
Last Answer : (B) Mechanical draft cooling tower
Description : Which of the following is a batch sedimentation equipment? (A) Dust catcher (B) Filter thickener (C) Dry cyclone separator (D) Rotary sprayer scrubber
Last Answer : (B) Filter thickener
Description : Removal of activated carbon from glycerine is done by (A) Plate and frame filter (B) Rotary vacuum filter (C) Batch basket centrifuge (D) None of these
Last Answer : (A) Plate and frame filter
Description : Which of the following is a vacuum filter? (A) Filter press (B) Rotary disc filter (C) Batch basket centrifuge (D) Tank filter (Nutsche filter)
Last Answer : (B) Rotary disc filter
Description : A thick paste of cement, sand and water is called – (1) Concrete (2) R.C.C. (3) Mortar (4) Kiln
Last Answer : (3) Mortar Explanation: Mortar is a workable paste used to bind construction blocks together and fill the gaps between them. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime, and water
Description : What is the combustion temperature range in cement kiln incineration? a) 1300-1600 b) 1350-1650 c) 1250-1450 d) 1235-1600
Last Answer : 1350-1650
Description : A thick paste of cement, sand and water is called (1) Concrete (2) R.C.C. (3) Mortar (4) Kiln
Last Answer : Mortar
Description : A power tiller is most suited for : A. Draft operation with rigid tools B. Rotary cultivation C. Stationary operation D. Transport work
Last Answer : B. Rotary cultivation
Description : A power tiller is most suited for rotary cultivation because: A. It generates negative draft B. Its traction requirements are low C. It provides high degree of soil pulverization D. All of the above
Last Answer : D. All of the above
Description : Rotary tillers are characterized by a) Lower and negative draft b) High power requirement c) Excessive pulverization d) All the above
Last Answer : d) All the above
Description : Rotary tiller are wide adopted in rice cultivation due to a) Excessive pulverization b) Suitability for pudding paddy field c) Reduced draft requirement d) Complete inversion of soil
Last Answer : b) Suitability for pudding paddy field
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 : Which is the most thermally efficient furnace? (A) Reheating furnace (B) Reverberatory furnace (C) Rotary kilns (D) Boiler furnace
Last Answer : (D) Boiler furnace
Description : . An example of a periodic furnace is the (A) Blast furnace stoves (B) Blast furnace (C) Coke oven heating chamber (D) Rotary kilns
Last Answer : (A) Blast furnace stoves
Description : In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of (A) Use of non-preheated combustion air (B) Use of pulverised solid ... of fuel & air and infiltration of air (D) Use of excessive positive draft in the furnace
Last Answer : (C) Imperfect mixing of fuel & air and infiltration of air
Description : Ingress of cold air in the furnaces through cracks, charging doors, openings etc (A) Reduces the flue gas temperature and makes the furnace atmosphere oxidising (B) Increases the load on the induced draft fan (C) Reduces the furnace draught (D) All (A), (B) and (C)
Description : Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by (A) Increasing the draft in the furnace (B) Preheating the fuel gas (C) Oxygen enrichment of combustion air (D) Preheating the combustion air
Last Answer : (A) Increasing the draft in the furnace
Description : Which of the following accentuates clinkering troubles on furnace grate burning coal? (A) Low reactivity of carbonised residue containing high proportion of iron & sulphur (B) Low forced draft & fuel bed temperature (C) Thick firebed and preheated primary air (D) All (A), (B) and (C)
Description : Circulation of gases in furnace is caused by the (A) Change in volume during a change of temperature (B) Difference in density between hot and cold gases (C) Furnace pressure in conjunction with draft in flues (D) All (A), (B) and (C
Last Answer : (D) All (A), (B) and (C
Description : Stack heat losses can be minimised by (A) Controlling the excess air (B) Oxygen enrichment of combustion air (C) Using low c.v. fuels (D) Maintaining proper draft in the furnace
Last Answer : (A) Controlling the excess air
Description : Turn down ratio of a burner (A) Should be as low as possible i.e., 1 : 2 (B) Should be 1:1 for a batch type furnace (C) Is the ratio of maximum to minimum permissible heat input rates (D) Is normally much more for a continuous furnace as compared to a batch furnace
Last Answer : (C) Is the ratio of maximum to minimum permissible heat input rates
Description : Which of the following is a batch furnace? (A) Cupola (B) Reheating furnace (C) Glass tank furnace (D) None of these
Last Answer : (A) Cupola
Description : In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the (A) Rate of firing and emissivity of flame (B) Thermal conductivity of the charge & ... (C) Nature of process; whether batch, continuous or intermittent (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 : 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)