Latest Chemical Engineering MCQs – Furnace Technology MCQs Competitive
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Latest Chemical Engineering MCQs
By practicing these MCQs of Chemical Furnace Technology MCQs – Latest Competitive Chemical Engineering MCQs , an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to “Furnace Technology Mcqs “. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Chemical Furnace Technology Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.
Latest Furnace Technology Mcqs
The most occurred mcqs of Furnace Technology in past papers. Past papers of Furnace Technology Mcqs. Past papers of Furnace Technology Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Furnace Technology Mcqs. The Important series of Furnace Technology Mcqs are given below:
Overfire burning in a furnace is a phenomenon characterised by____________________?
A. Supply of excess air
B. Supply of excess fuel
C. Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
D. None of these
Regenerators are normally provided in the____________________?
A. Open hearth furnace
B. Glass melting furnace
C. By product coke ovens
D. All A., B. and C.
Which furnace employs preheating, heating and soaking zones ?
A. Open hearth furnace
B. Reheating furnace
C. Soaking pit
D. Cupola
Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?
A. Stoichiometric combustion air
B. Recuperators
C. Combustion air not enriched with oxygen
D. Non-preheated combustion air
Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?
A. Furnace oil with oxygen
B. Furnace oil with air
C. Blast furnace gas with air
D. Blast furnace gas with oxygen
Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?
A. Fine dolomite
B. Ammonia
C. Alkaline powders
D. None of these
The function of an economiser in a boiler is to preheat the _____________________?
A. Feedwater
B. Pulverised coal
C. Combustion air
D. Furnace oil
Which of the following furnaces will have maximum thermal efficiency ?
A. Rotary kilns
B. Walking beam reheating furnace
C. Boiler furnace
D. Soaking pits
Ostwald charts are meant for__________________?
A. Computing the excess/deficiency of combustion air
B. Computation of flue gas analysis
C. Calculation of flue gas temperature
D. None of these
Pick out the wrong statement ?
A. Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases
B. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
carburise the surface of steel at annealing temperatures
C. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation
with increase in surface hardness
D. None of these
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?
A. 1050
B. 750
C. 350
D. 1250
Fluid Mechanics Mcqs
In reverberatory furnace, charge is heated mainly by__________________?
A. Natural convection
B. Conduction
C. Radiation of heat from the roof of the combustion chamber
D. None of these
Which one shows the diagrammatic heat balance in a furnace ?
A. Sankey diagram
B. Ostwald chart
C. Cox chart
D. None of these
_____________ atmosphere is maintained inside an iron blast furnace?
A. Inert
B. Reducing
C. Oxidising
D. Decarburising
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an ______________ furnace?
A. Covered
B. Underfired
C. Sidefired
D. Recirculating
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
A. Ash disposal problem
B. Erosion of induced draft fan blades
C. Higher power consumption in its transportation
D. Excessive fly ash discharge from the stack
Large tonnage of refractory bricks are dried in a_____________________?
A. Rotary hearth furnace
B. Shaft furnace
C. Tunnel kiln
D. Muffle furnace
A refractory wall separating the stock and the source of heat is provided in a__________________?
A. Continuous furnace
B. Muffle furnace
C. Updraft kiln
D. None of these
Turndown ratio of a burner gives an idea of the ______________ in the furnace?
A. Range of fuel firing rates
B. Maximum heat input rate only
C. Volume of the combustion chamber
D. Minimum heat input rate only
Which is a continuous furnace ?
A. Annealing furnace
B. Coke ovens
C. Glass tank furnace
D. None of these
Fuel economy in furnaces can be achieved by_________________?
A. Preheating the combustion air
B. Using oxygen enriched combustion air
C. Reducing the heat loss through furnace openings & doors
D. All A., B. and C.
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. Reduces the furnace draught
C. Increases the load on the induced draft fan
D. All A., B. and C.
Which is the most thermally efficient furnace _______________________?
A. Reverberatory furnace
B. Reheating furnace
C. Rotary kilns
D. Boiler furnace
The advantages of firing pulverised coal in the furnace lies in the fact that, it_____________________?
A. Permits the use of low fusion point ash coal
B. Permits the use of high ash content coal
C. Accelerates the burning rate and economises on fuel consumption
D. All A., B. and C.
_____________ furnace is not an electric furnace?
A. Induction
B. Arc
C. Pot
D. Resistance
To reduce the stack loss, heat recovery from flue gas can be done by_____________________?
A. Preheating of combustion air
B. Preheating of cold stock
C. Steam generation in waste heat boilers
D. All A., B. and C.
Size of the combustion chamber of a furnace depends upon the ___________________?
A. Preheat temperature of fuel & air
B. Heat release rate of the fuel
C. Method of mixing the fuel & air
D. All A., B. and C.
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?
A. Low frequency induction
B. Arc
C. Resistance
D. None of these
Which of the following is a heat treatment furnace ?
A. Reheating furnace
B. Annealing furnace
C. Muffle furnace
D. Rotary kiln
In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?
A. Use of pulverised solid fuels
B. Use of non-preheated combustion air
C. Imperfect mixing of fuel & air and infiltration of air
D. Use of excessive positive draft in the furnace
Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?
A. 45-50
B. 25-30
C. 10-15
D. 65-70
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. Oxygen enrichment of combustion air
C. Preheating the fuel gas
D. Preheating the combustion air
Chemical Heat Transfer Mcqs
Heat transfer rate to the charge/stock in a furnace does not depend upon the________________?
A. Type of fuels viz. solid, liquid or gaseous
B. Emissivity of refractory walls
C. Flue gas temperature
D. Initial temperature of the charged stock
The amount of combustible escaping unconsumed from the furnace, depends upon the________________?
A. Burner design (thoroughness of mixing versus stratification)
B. Air supplied and furnace temperature
C. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
D. All A., B. and C.
Reducing atmosphere is maintained in a__________________?
A. Soaking pit
B. Blast furnace
C. Calcination kiln
D. L.D. converter
Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an__________________?
A. Steam boiler
B. Blast furnace
C. Salt bath furnace
D. Annealing furnace
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of_________________?
A. Thoria
B. Graphite powder
C. Zircon powder
D. Beryllium
Which one is not an induced draught furnace ?
A. Blast furnace stove
B. High pressure boiler
C. Sintering furnace
D. None of these
Furnace pressure is normally controlled by regulating the__________________?
A. Fuel gas pressure
B. Air pressure
C. Speed of I.D. fan
D. Damper
______________ is an indirectly heated furnace?
A. Soaking pit
B. Muffle furnace
C. Open hearth furnace
D. Reheating furnace
Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?
A. Blast furnace stoves
B. Coke oven
C. Beehive coke oven
D. High pressure boiler
Reverberatory furnace is used for_____________________?
A. Roasting/reduction of ores
B. Heating air
C. Annealing steel coil
D. Steel melting
Fuel used in B.F. stove is______________________?
A. Furnace oil
B. Pulverised coal
C. Blast furnace gas/mixed gas
D. Coke oven gas
In a furnace operation, which is not preheated ?
A. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
B. Solid fuels
C. Both A. and B.
D. Neither A. nor B.
The main function of a muffle in the muffle furnace is to__________________?
A. Protect the charge from the effects of the products of combustion Smooth out temperature inequalities on the combustion side of the muffle wall
B. Protect the charge from the effects of the products of combustion
C. Both A. & B.
D. Neither A. nor B.
Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?
A. Emissivity of the refractory walls
B. Thickness of the stock
C. Use of waste heat recovery equipments
D. Size of the furnace
In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
A. More of excess air
B. More of CO in flue gas
C. Less of excess air
D. More of CO2 in flue gas
Which is a regenerative furnace ?
A. Open hearth furnace
B. Coke oven heating chamber
C. Both A. and B.
D. Neither A. nor B.
In a furnace employing forced draught as compared to induced draught______________________?
A. The fan operates hot and hence blades are liable to corrosion and erosion
B. Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
C. Positive pressure exists in the furnace
D. None of these
An example of recuperative furnace is the__________________?
A. Soaking pit
B. Coke ovens
C. Open hearth furnace
D. None of these
Example of an indirectly heated furnace is__________________?
A. Muffle furnace
B. Hood annealing furnace
C. Both A. and B.
D. Neither A. nor B.
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of_________________?
A. Drying of coal
B. Transportation of coal
C. Combustion of coal by supplying it around the burner
D. Preheating the primary air
Chemical Engineering Basics Mcqs
Which of the following is a directly fired intermittent furnace ?
A. Tower furnace
B. Reverberatory furnace
C. Walking beam reheating furnace
D. Tunnel kiln
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?
A. Preheating the fuel gas
B. Oxygen enrichment of combustion air
C. Preheating the combustion air
D. All A., B. & C.
If fuel and air are mixed ahead of the burner, it is called a/an ______________ burner?
A. Premix
B. Rotary
C. Outside mixing type
D. Diffusion
Heat balance of furnace provides means of determining the_________________?
A. Sources of heat losses
B. Thermal efficiency of the process
C. Scope of reduction of heat losses
D. All A., B. and C.
Means for giving direction to the circulation of gases in furnaces are_____________________?
A. Arrangement of heating stock in the furnaces
B. Fans
C. Location of outlet ports and heating & combustion devices
D. All A., B. and C.
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?
A. < 2
B. < 8
C. < 5
D. < 10
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. Thick firebed and preheated primary air
C. Low forced draft & fuel bed temperature
D. All A., B. and C.
Cement Kiln is a___________________?
A. Rotary Kiln
B. Natural draft furnace
C. Tunnel Kiln
D. Batch furnace
Regenerators as compared to recuperators for the same duty_________________?
A. Are lighter & compact
B. Store smaller quantity of waste heat
C. Involve higher initial cost
D. All A., B. & C.
The purpose of controlling the furnace atmosphere is to prevent surface attack by__________________?
A. Decarburising
B. Oxidation/scaling
C. Sulphur penetration
D. Either of the above
Which is not accomplished in an underfired furnace ?
A. Increase in heating capacity/m2 of floor space
B. Reduction in the temperature of furnace gases
C. Elimination of cold spot at the bottom of the charge
D. Protection of the periphery of the charge from excessive radiation
Circulation of gases in furnace is caused by the_________________?
A. Difference in density between hot and cold gases
B. Change in volume during a change of temperature
C. Furnace pressure in conjunction with draft in flues
D. All A., B. and C.
Which of the following variables does not affect the furnace capacity ?
A. Gas velocity in furnace
B. Size of the furnace
C. Ratio of wall surface to surface of stock
D. None of these
An example of a periodic furnace is the__________________?
A. Blast furnace stoves
B. Coke oven heating chamber
C. Blast furnace
D. Rotary kilns
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?
A. Increase in calorific value of the fuel
B. Reduction in scale losses
C. Increase in flame temperature
D. Saving in fuel consumption
Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?
A. Ceramic recuperator
B. Regenerator
C. Economiser
D. Waste heat boiler
Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an_________________?
A. Steam superheater
B. Economiser
C. Air preheater
D. All A., B. and C.
Use of pulverised coal in boilers provides____________________?
A. Smokeless burning
B. Better combustion
C. Higher calorific value
D. Less erosion on furnace wall