Furnace Technology MCQs Competitive – Latest Chemical Engineering MCQs
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Latest Chemical Engineering MCQs
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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:
Which of the following variables affects the furnace capacity ?
A. Thermal conductivity of stock
B. Temperature of flue gas
C. Thickness of heating stock
D. All A., B. and C.
Scaling of furnace stock is reduced by _______________ in flue gas?
A. H2
B. CO
C. High CO/CO2
D. All A., B. & C.
An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?
A. Walking beam
B. Tunnel
C. Shaft
D. Rotary hearth
Forced recirculation of furnace gases is practised_______________?
A. To ensure uniform temperature
B. To increase heat transfer by convection
C. In furnaces, operating below 750°C
D. All A., B. and C.
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________________?
A. Nature of process; whether batch, continuous or intermittent
B. Thermal conductivity of the charge & structural materials of furnace
C. Rate of firing and emissivity of flame
D. All A., B. and C.
Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ °C?
A. 100
B. 50
C. 150
D. 250
Which of the following is a batch furnace ?
A. Cupola
B. Glass tank furnace
C. Reheating furnace
D. None of these
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?
A. 65
B. 50
C. 85
D. 99
Which of the following is not a recuperative furnace ?
A. Reheating furnace
B. Soaking pit
C. Steam boiler
D. Coke oven
An example of shaft furnace is the__________________?
A. Glass melting tank
B. L.D. converter
C. Blast furnace
D. Soaking pit
In salt bath furnace, heat is transferred to the charge mainly by __________________?
A. Conduction
B. Radiation
C. Convection
D. None of these
The heating capacity of muffle furnace depends on the____________________?
A. Properties of the muffle wall (temperature, area, and emissivity)
B. Surface area & emissivity of the stock
C. Both A. & B.
D. Neither A. nor B.
Chemical Engineering Basics Mcqs
Furnace aerodynamics is related to the _____________ in the furnace?
A. Movement of gases
B. Temperature control
C. Measurement of flue gas volume
D. Pressure adjustment
Which of the following is a periodic furnace ?
A. Rotary kiln
B. Tunnel kiln
C. Soaking pit
D. Reheating furnace
Pulverised fuel fired furnaces employ ______________ fuel firing?
A. Vertical
B. Horizontal
C. Tangential
D. All A., B. and C.
Main gas valve in a gaseous fuel burner is a ______________ valve?
A. Gate
B. Globe
C. Butterfly
D. None of these
Turn down ratio of a burner____________________?
A. Should be 1:1 for a batch type furnace
B. Should be as low as possible i.e., 1 : 2
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
Which is not a hearth furnace ?
A. Open hearth furnace
B. Glass tank furnace
C. Cupola
D. Reheating furnace
Combustion of fuel in a furnace with oxygen enriched air results in higher__________________?
A. Fuel consumption
B. Flame temperature
C. Flue gas volume
D. Stack loss
Regenerators compared to the recuperators for the same duty__________________?
A. Occupy more space
B. Are of smaller size
C. Are less costly
D. All A., B. and C.
Ceramic recuperators compared to metallic recuperators for the same duty_________________?
A. Are less costly
B. Occupy more space
C. Are lighter
D. Have higher pressure differential between flue gas & air side
Rate of heat release in a furnace, which is the measure of heat intensity, is defined as_________________?
A. kcal/hr/m3 combustion space
B. kcal/hr
C. kcal/m3 combustion space
D. None of these
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?
A. Corrosive nature of the waste gas
B. Dust concentration & nature of dust in waste gas
C. Quantity & temperature of waste gas
D. All A., B. and C.
Maximum heat transfer in high temperature furnaces is by____________________?
A. Convection
B. Conduction
C. Radiation
D. Either A., B. or C.; depends on the type of furnace
Decarburisation of steel__________________?
A. Is the removal of carbon from iron carbide (Fe3C)
B. Is favoured by CO2
C. Affects its crystalline structure
D. All A., B. and C.
Hearth furnaces are not used for____________________?
A. Melting
B. Roasting
C. Reheating
D. None of these
In a muffle furnace, the muffle_________________?
A. Assists in temperature equalisation in the charge
B. Retards the heat transfer
C. Permits the use of controlled atmosphere for the protection of stock
D. All A., B. and C.
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?
A. 60
B. 5
C. 20
D. 40
Regenerators are used for waste heat recovery in____________________?
A. By-product coke ovens
B. Blast furnace stoves
C. Beehive coke oven
D. Soaking pits
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ °C?
A. 850
B. 650
C. 250
D. 1000
Air filtration in a furnace___________________?
A. Reduces its thermal efficiency
B. Increases the flue gas temperature
C. Is indicated by flame sting out
D. None of these
Which of the following is not a directly fired furnace ?
A. By-product coke oven
B. Sintering furnace
C. Calcination kiln
D. Open hearth furnace
Thermal efficiency of an open hearth furnace may be about _____________ percent?
A. 50
B. 20
C. 5
D. 80
The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
A. Resistance
B. Arc
C. Low frequency induction
D. High frequency induction
Which of the following is the most suitable for preheating combustion air above 650°C ?
A. Metallic recuperator
B. Regenerator
C. Ceramic recuperator
D. None of these
Fluid Mechanics Mcqs
Artificial draught produced by a fan in the furnace can be controlled by the___________________?
A. Damper
B. Speed of the fan
C. Variation in the pitch of fan blades
D. All A., B. and C.
Protective gas used in the annealing furnace for steel coil comprises of__________________?
A. 95% N2 + 5% H2
B. 100% CO
C. 5% H2 + 9% N2
D. 100% H2
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ °C?
A. 180
B. 130
C. 80
D. 250
Reheating furnace (pusher type) is used for heating_____________________?
A. Steel coils
B. Slabs
C. Ingots
D. Steel sheets
Shaft furnaces are used for_______________________?
A. Calcining
B. Smelting
C. Roasting
D. All A., B. and C.
Regenerators are installed in_______________?
A. Open hearth furnace
B. Coke ovens
C. Both A. & B.
D. Neither A. nor B.
Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?
A. Causing metal embrittlement
B. Accelerating the rate of scaling
C. Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
D. All A., B. and C.
In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the__________________?
A. Cox chart
B. Ostwald chart
C. Sankey diagram
D. None of these
In producer gas making furnace, steam is added along with air to mainly control the____________________?
A. Fusion of coal ash & clinker formation
B. C. V. of producer gas
C. Tar content in producer gas
D. Temperature of producer gas
Thermal efficiency of furnaces can be improved by____________________?
A. Maintaining proper draught
B. Minimising heat losses from furnace walls
C. Waste heat recovery from flue gas
D. All A., B. and C.
Power required in case of forced draught as compared to induced draught (for the same draught produced) is___________________?
A. More
B. Less
C. Same
D. Either more or less; depends on the flue gas density
While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about _____________ °C?
A. 3000
B. 2000
C. 4500
D. 6000
Rotary kilns are used in the____________________?
A. Cement manufacture
B. Calcination of limestone & dolomite
C. Both A. and B.
D. Neither A. nor B.
Soaking pits are meant for heating steel_________________?
A. Ingots
B. Sheets
C. Coils
D. Slabs
Pot furnace which is either regenerative or recuperative, is used in the manufacture of____________________?
A. Glass
B. Potteries
C. Stainless steel
D. Refractory bricks
Very high pressure boilers are usually _____________ boilers?
A. Water tube
B. Fire tube
C. Waste heat
D. Natural circulation
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about _____________ percent?
A. 40
B. 20
C. 60
D. 80
Chemical Reaction Mcqs
Advantages of use of preheated combustion air are__________________?
A. Reduction in scale losses
B. Saving in fuel consumption
C. Increase in flame temperature
D. All A., B. and C.
Maximum thermal efficiency of boiler may be about _____________ percent?
A. 25
B. 10
C. 65
D. 90
Thermal efficiency of a limestone calcination rotary kiln may be around ______________ percent?
A. 65
B. 40
C. 20
D. 80
Unit of furnace loading is____________________?
A. Ton stock/hr/m2 hearth area
B. Ton stock/m2 hearth area
C. Ton stock/hr
D. Both B. and C.
Specific heating capacity of a furnace is expressed as_____________________?
A. Weight heated/furnace volume
B. Weight heated/hr
C. Weight heated/hr/furnace volume
D. None of these
Coke ovens in steel plant are heated by____________________?
A. Blast furnace gas/mixed gas
B. Electricity
C. Coke oven gas
D. Both B. and C.
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the__________________?
A. Type of burner and combustion chamber
B. Amount of excess air supplied and load on the boiler
C. Physical nature, ash content and fineness of the coal
D. All A., B. and C.
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by__________________?
A. Convection
B. Conduction
C. Radiation
D. Cannot be predicted
The reason for excessive clinker formation in gas producers is the_____________________?
A. Use of fuel having too low an ash fusion temperature
B. Use of coal/coke containing a high % of fines and ash
C. Development of hot spots in the fuel bed and an abnormally high rate of gasification
D. All A., B. and C.
The rate of scaling of furnace stock depends upon the_________________?
A. Time
B. Temperature
C. Nature of atmosphere
D. All A., B. and C.
In low or standard frequency induction furnace, heat is produced by the_______________________?
A. Current flow through a heating element
B. Induction and resistance
C. Combination of induced current and skin effect
D. None of these
The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about ____________ percent?
A. 70
B. 40
C. 15
D. 85
Neutral atmosphere is maintained in a/an ____________ furnace?
A. Cold rolled steel coil annealing
B. Soaking pit
C. Open hearth
D. Walking beam reheating
An example of indirectly heated furnace is the_________________?
A. Reheating furnace
B. Muffle furnace
C. Soaking pit
D. None of these
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of__________________?
A. High thermal conductivity
B. Low emissivity
C. Both A. and B.
D. Neither A. nor B.
The resistance furnace produces heat by the__________________?
A. Combination of induced current and skin effect
B. Flow of current through a heating element
C. Electric arc struck between electrodes and the charge
D. None of these
Dampers are located__________________?
A. Before the I.D fan
B. Near the top of the chimney
C. After the I.D. fan
D. Anywhere after the I.D. fan