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 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 : An example of indirectly heated furnace is the (A) Soaking pit (B) Muffle furnace (C) Reheating furnace (D) None of these
Last Answer : (B) Muffle furnace
Description : Neutral atmosphere is maintained in a/an __________ furnace. (A) Cold rolled steel coil annealing (B) Open hearth (C) Soaking pit (D) Walking beam reheating
Last Answer : (A) Cold rolled steel coil annealing
Description : Which furnace employs preheating, heating and soaking zones? (A) Soaking pit (B) Reheating furnace (C) Open hearth furnace (D) Cupola
Last Answer : (B) Reheating furnace
Description : __________ is an indirectly heated furnace. (A) Open hearth furnace (B) Muffle furnace (C) Soaking pit (D) Reheating furnace
Description : Which of the following is not a recuperative furnace? (A) Soaking pit (B) Reheating furnace (C) Steam boiler (D) Coke oven
Last Answer : (D) Coke oven
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 : 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 : 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 : 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 : Cement Kiln is a (A) Rotary Kiln (B) Tunnel Kiln (C) Natural draft furnace (D) Batch furnace
Last Answer : (A) Rotary Kiln
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 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 recuperative furnace is the (A) Soaking pit (B) Open hearth furnace (C) Coke ovens (D) None of these
Last Answer : (A) Soaking pit
Description : Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percentfurnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C. (A) 5 (B) 60 (C) 20 (D) 40
Last Answer : (C) 20
Description : An example of shaft furnace is the (A) L.D. converter (B) Glass melting tank (C) Blast furnace (D) Soaking pit
Last Answer : (C) Blast 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 : . 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 furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by (A) Conduction (B) Convection (C) Radiation (D) Cannot be predicted
Last Answer : (C) Radiation
Description : In which of the following furnaces, the gases are sucked through the stock bed from below? (A) Soaking pit (B) Sintering machine (C) Beehive oven (D) None of these
Last Answer : (B) Sintering machine
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 : 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 : 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 thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent. (A) 15 (B) 40 (C) 70 (D) 85
Description : Reheating furnace (pusher type) is used for heating (A) Ingots (B) Slabs (C) Steel coils (D) Steel sheets
Last Answer : (B) Slabs
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 : The heating capacity of continuous reheating furnace depends upon the (A) Hearth area and furnace temperature (B) Emissivity of the stock (C) Ratio of wall surface to stock surface (D) All (A), (B) and (C)
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 : Regenerators are used for waste heat recovery in (A) By-product coke ovens (B) Beehive coke oven (C) Blast furnace stoves (D) Soaking pits
Last Answer : (A) By-product coke ovens
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
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 : Air preheater is not used as a waste heat recovery system in a____. a) Boiler b) billet Reheating Furnace c) Heat treatment furnace d) compressor
Last Answer : compressor
Description : Recuperated is used mainly as a waste heat recovery system in a ____. a) Boiler b) Billet Reheating Furnace c) Compressor d) None of the above
Last Answer : Billet Reheating Furnace
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 heat treatment shop, steel components are heat-treated in batches of 80 Tons. The heat treatment cycle is as follows; Increase temperature from 30 OC to 850 OC in 3 hours. ... efficiency of 80%, for same requirement. The investment towards installation of the new furnace is Rs. 50
Last Answer : Quantity of steel treated per batch - 80 Tons a. Efficiency of Furnace: Useful heat supplied to steel - 80000 x 0.12 x (850 - 30) = 7872000 kcal/batch .1 mark Total heat ... = Rs. 64400/batch Efficiency of new LPG furnace - 80% Heat supplied in new LPG furnace - 7872000/0.8
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 furnace employs natural draft? (A) Coke oven (B) Boiler (C) Rotary kilns (D) L.D. converter
Last Answer : (A) Coke oven
Description : Hearth furnaces are not used for (A) Roasting (B) Melting (C) Reheating (D) None of these
Last Answer : (D) None of these
Description : Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres. (A) Improving the stretchability (B) Dyeing/colouring (C) Detergent solution washing (D) Glycol soaking
Last Answer : (C) Detergent solution washing
Description : Soaking pits are meant for heating steel (A) Ingots (B) Coils (C) Sheets (D) Slabs
Last Answer : (A) Ingots
Description : Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called (A) Tempering (B) Hardening (C) Annealing (D) Normalising
Last Answer : Option C
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