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 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 : 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 : . 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 : 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 : 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 : 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 : 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 : 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)
Description : In reverberatory furnace, charge is heated mainly by (A) Conduction (B) Natural convection (C) Radiation of heat from the roof of the combustion chamber (D) None of these
Last Answer : (C) Radiation of heat from the roof of the combustion chamber
Description : Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting
Last Answer : (A) Roasting/reduction of ores
Description : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air in a reverberatory furnace to obtain th
Last Answer : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air ... III and IV D. I , II , III and IV
Description : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined with haematite. Reason: Haematite oxidises
Last Answer : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined ... -1 is false but Statement -2 is true
Description : When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matter contains__________
Last Answer : When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper ... sulphides of copper (I) and iron (III)
Description : A coal with high ash content is undesirable, as (A) It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber (B) The ash in molten condition gets absorbed in the pores of the ... and stick to the boiler tubes thereby reducing the heat transfer (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
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 : 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 : 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 : 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 : 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 : 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 function of an economiser in a boiler is to preheat the (A) Feedwater (B) Combustion air (C) Pulverised coal (D) Furnace oil
Last Answer : (A) Feedwater
Description : Which one is not an induced draught furnace? (A) Blast furnace stove (B) Sintering furnace (C) High pressure boiler (D) None of these
Last Answer : (A) Blast furnace stove
Description : Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an (A) Blast furnace (B) Steam boiler (C) Salt bath furnace (D) Annealing furnace
Last Answer : (C) Salt bath furnace
Description : Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the (A) Quantity & temperature of waste gas (B) Dust concentration & nature of dust in waste gas (C) Corrosive nature of the waste gas (D) All (A), (B) and (C)
Last Answer : (B) Dust concentration & nature of dust in waste gas
Description : Which furnace employs an I.D. fan for the removal of flue gases from the furnace? (A) Coke oven (B) Blast furnace stoves (C) Beehive coke oven (D) High pressure boiler
Last Answer : (D) High pressure boiler
Description : Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace? (A) Economiser (B) Regenerator (C) Ceramic recuperator (D) Waste heat boiler
Last Answer : (B) Regenerator
Description : Which of the following fuels is generally not used in thermal power plant boiler firing? (A) Furnace oil, light diesel oil and tar/PCM (B) Pulverised coking coal (C) Coal middling from washeries (D) B.F. gas, coke oven gas and L.D. converter gas
Last Answer : (B) Pulverised coking coal
Description : Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the (A) ... chamber (B) Risk of explosion (C) Chances of clinker formation (D) Incomplete combustion of coal
Last Answer : (B) Risk of explosion
Description : Use of pulverised coal in boiler furnace provides (A) High calorific value (B) Better combustion (C) Smokeless burning (D) Less erosion on furnace walls
Last Answer : (B) Better combustion
Description : White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is (A) Tar (B) Coke oven gas (C) Pitch (D) Pulverised coke
Last Answer : (B) Coke oven gas
Description : Function of fusible plug in a boiler is to (A) Drain out water and sludge from the boiler during repair (B) Put off fire in the furnace when water level in the boiler falls to unsafe limit (C) Guard the boiler in case of abnormal rise in steam pressure (D) All (A), (B) & (C)
Last Answer : (B) Put off fire in the furnace when water level in the boiler falls to unsafe limit
Description : Blow off cock is provided in steam boiler to (A) Guard the boiler in case of abnormal rise in steam pressure (B) Drain out water and sludge during its repair (C) Regulate the supply of water in boiler (D) Put out the fire in the furnace when the water level in the boiler falls to unsafe limit
Last Answer : (B) Drain out water and sludge during its repair
Description : Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by (A) Conduction (B) Convection (C) Radiation (D) Both 'a' & 'b'
Last Answer : Option C
Description : Statement-1: Silica is added as a flux in reverberatory furnance, in the extraction of copper from copper pyrites. Statement-2: Silica decreases the m
Last Answer : Statement-1: Silica is added as a flux in reverberatory furnance, in the extraction of copper from ... Statement-1 is false but Statement -2 is true
Description : Steam distillation is not recommended to be used, if the (A) Azeotropic mixture is to be separated and the final product is miscible with water (B) Liquids decompose, if ... unstable or has the tendency to react with other components associated with it, at the boiling temperature
Last Answer : (A) Azeotropic mixture is to be separated and the final product is miscible with water
Description : Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be (A) 0.35 (B) 0.45 (C) 0.55 (D) 0.85
Last Answer : (B) 0.45
Description : The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is (A) 1.66 (B) 88.66 (C) 3.66 (D) Dependent on NRe only
Last Answer : (C) 3.66
Description : The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is (A) 2.36 (B) 4.36 (C) 120.36 (D) Dependent on NRe only
Last Answer : (B) 4.36
Description : Low water in boiler drum is unsafe because it may result in overheating of water tubes in furnace. Why it is unsafe to have high water condition in boiler drum ?
Last Answer : High drum level does not allow steam separation to be effective and some water can be carried over with steam which is not desirable for steam turbine.
Description : Where is water steam separator drum located in Lamont boiler ? a. Inside of the boiler b. Right above the furnace c. Before the feed water pump d. Outside the boiler
Last Answer : d. Outside the boiler
Description : What is called as the heart of the Lamont boiler? a. Water drum b. Centrifugal pump c. Furnace d. Blower
Last Answer : b. Centrifugal pump