Competitive Chemical Engineering MCQs – Updated Fuels And Combustion MCQs
This post is comprising of latest ” Fuels And Combustion MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest chemical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding chemical engineering then read these mcqs of Design of Steel Structures.
Latest Chemical Engineering MCQs
By practicing these MCQs of Fuels And Combustion 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 “Fuels And Combustion Mcqs “. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of Chemical engineering to approach the success. Tab this page to check “Fuels And Combustion 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 Fuels And Combustion Mcqs
The most occurred mcqs of Fuels And Combustion in past papers. Past papers of Fuels And Combustion Mcqs. Past papers of Fuels And Combustion 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 Fuels And Combustion Mcqs. The Important series of Fuels And Combustion Mcqs are given below:
Fuel combustion is never cent per cent efficient due to___________________?
A. Moisture loss
B. Dry gas/stack gas loss
C. Incomplete combustion
D. All A., B. and C.
Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?
A. Moisture content
B. Colour
C. Ash content
D. Volatile matter
Insitu theory and drift theory are related to the____________________?
A. Coalification
B. Origin of coal
C. Origin of petroleum oil
D. Variation of coal quality with depth
Washing of coal________________?
A. Improves its coking properties
B. Controls its ash fusibility and increases its calorific value
C. Reduces its sulphur and ash content
D. All A., B. and C.
A good metallurgical coke should have very low__________________?
A. Sulphur & phosphorous content
B. Fusion point of its ash
C. Porosity
D. Hardness & strength
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3), while the C.V. is same on weight basis (i.e., kcal/kg) ?
A. Propane and acetylene
B. Sewage gas and gobar gas
C. Propane and LPG
D. B.F. gas and coke oven gas
Ignition temperature decreases progressively from anthracite to lignite, because___________________?
A. Volatile matter content increases
B. Moisture content increases
C. Carbon content decreases
D. Ash content increases
(64-132) rank coal (ASTM) means a coal with 64%___________________?
A. Fixed carbon and having a heat value of 13, 200 BTU/1b
B. Fixed carbon and a heating value of 132 BTU/1b
C. Ash and a heating value of 13, 200 BTU/1b
D. None of these
The most matured coal out of the following is__________________?
A. Sub-bituminous
B. Semi-anthracite
C. Lignite
D. Bituminous
Calorific value of both the solid & liquid fuels can be determined by using ______________ calorimeter?
A. Boy’s
B. Bomb
C. Junker’s
D. None of these
The advantage 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 combustion
D. All A., B. and C.
Function of secondary air in pulverised coal firing is to_________________?
A. Dry the coal
B. Transport the coal to the burner
C. Ensure efficient burning of coal around the burner
D. Reduce primary air requirement
A coal having higher volatile matter content will necessarily have lower____________________?
A. Calorific value
B. Ash fusion temperature
C. Ignition temperature
D. Caking index
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around ______________ cm/hr?
A. 2.5
B. 10
C. 0.5
D. 20
Low temperature carbonisation of coal produces_________________?
A. No by-products
B. Soft coke
C. Very low calorific value coke oven gas
D. Metallurgical coke
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?
A. Increase or decrease depending on the fuel type
B. Decrease
C. Increase
D. Not change
Blast furnace coke is made from coal by_____________________?
A. Medium temperature carbonisation
B. High temperature carbonisation
C. Low temperature carbonisation
D. Heating the coal in an oven in presence of air
In flue gas analysis by Orsat’s apparatus, oxygen is absorbed by____________________?
A. Cuprous chloride
B. Potassium hydroxide
C. Alkaline pyrogallol solution
D. None of these
Dry air requirement for burning 1 Nm3 of CO to CO2 may be around _______________ Nm3 ?
A. 2.4
B. 0.87
C. 1.75
D. 11.4
Naphthalene is used for making_________________?
A. Unsaturated polyesters
B. Insecticides (e.g. moth balls)
C. Drug intermediates e.g. β-naphthol
D. All A., B. and C.
Which of the following accounts for maximum energy loss in a boiler ?
A. Flue gases
B. Incomplete combustion
C. Ash content in the fuel
D. Unburnt carbon in flue gases
Fertilizer Technology Mcqs
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about _______________ percent?
A. 55
B. 25
C. 5
D. 75
Anthracite can be used for___________________?
A. Making carbon electrodes
B. Recarbonising steel
C. Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke
D. All A., B. and C.
Froth floatation is used for_________________?
A. Washing fine coal dust (< 0.5 mm size)
B. Removing ash from the coal based on difference in specific gravity of coal and ash
C. Washing lump coal (> 80 mm size)
D. All A., B. and C.
Main constituent of natural gas is ________________?
A. CH4 (upto 90%)
B. C3H8
C. C2H6
D. H2
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?
A. Ammonium sulphate
B. Ammonium phosphate
C. Ammonium nitrate
D. None of these
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?
A. Low calorific value of the fuel
B. Presence of large quantity of hydrogen in the fuel
C. High sulphur content in the fuel
D. Lack of thorough mixing of fuel with air
64-132) rank coal (ASTM) means a coal with 64%___________________?
A. Fixed carbon and having a heating value around 13, 200 BTU/1b
B. Fixed carbon and heating value around 132 BTU/1b
C. Ash and heating value around 13, 200 BTU/1b
D. None of these
With increases in carbonisation temperature_______________________?
A. Coke even gas yield increases
B. Hydrogen percentage in the coke oven gas decreases
C. Tar yield increases
D. Methane percentage in the coke oven gas increases
Which of the following is a rich fuel gas ?
A. Coal gas from underground gasification of coal
B. Producer gas
C. Refinery gases
D. None of these
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of__________________?
A. Correct amount of air for combustion
B. Less air for combustion
C. Too much air for combustion
D. Pulverised coal in boilers
Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron?
A. 5000
B. 2000
C. 300
D. 10000
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces __________________?
A. Lower amount of hydrogen
B. Higher amount of methane
C. Both A. and B.
D. Higher amount of both methane and hydrogen
Coal is heated in absence of air for 7 minutes at a temperature of about ______________ °C, during its volatile matter determination for proximate analysis?
A. 750
B. 550
C. 950
D. 1150
Fuels And Combustion Mcqs
Moisture loss is determined by the _______________________?
A. Moisture content of fuel
B. Humidity of combustion air
C. Both A. and B.
D. The water formed by combustion reaction
High ash coals ____________________?
A. Produce larger quantity of coke oven gas
B. Require longer time of carbonisation as ash offers resistance to heat transfer
C. Are soft & friable (poor strength and size stability)
D. None of these
Presence of force moisture in coal is most disadvantageous during its __________________?
A. Transportation and handling
B. Storage
C. Pulverisation
D. Washing
If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as___________________?
A. CO
B. O2
C. N2
D. SO2
With increase in the time of carbonisation at a particular temperature (say 1000°C), the ______________ percentage in coke oven gas increases?
A. Hydrogen
B. Unsaturated hydrocarbons
C. Methane
D. All A., B. and C.
Preheating of ______________ the flame temperature?
A. Combustion air decreases
B. The gaseous fuel before combustion decreases
C. Either the fuel or the air or both, increases
D. Either the fuel or the air does not affect
As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion _______________ for the same percentage of excess air?
A. Remain same
B. Increases
C. Decreases
D. May increase or decrease depending on the type of fuel
Low temperature oxidation of coal is accelerated by the____________________?
A. Storage in large heaps
B. Absence of porous or friable particles
C. Storage in compressed piles
D. All A., B. and C.
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of_______________?
A. Benzol
B. Tar
C. Ammonia
D. None of these
Which of the following is a measure of the agglutinating (i.e., binding) property of coal ?
A. Swelling index
B. Caking index
C. Thickness of plastic layer
D. Gray-king index
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent?
A. 80 and 97
B. 40 and 70
C. 95 and 100
D. 25 and 97
A good quality coal should have ___________________?
A. High ash content
B. Low fusion point of ash
C. High sulphur
D. None of these
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of___________________?
A. Water gas
B. Coke oven gas
C. Natural gas
D. Blast furnace gas
When the coal is heated in absence of air, it is called its ________________?
A. Gasification
B. Deoxidation
C. Coalification
D. Carbonisation
High temperature carbonisation of coal takes place at _______________ °C?
A. 600
B. 2000
C. 1100
D. 1600
With increase in C/H ratio of a fuel, the dew point of flue gases______________________?
A. Remain same
B. Decreases
C. Increases
D. May increase or decrease; depends on the type of fuel
Mechanical Operations Mcqs
Coking time in a commercial high temperature coal carbonisation plant is about ______________ hours?
A. 28
B. 18
C. 6
D. 36
Which of the following would require maximum amount of % excess air for complete combustion ?
A. Furnace oil
B. Coke oven gas
C. Pulverised coal
D. Lump coal (fixed on chain grate)
Which of the following is not a micro component present in coal ?
A. Fusinite
B. Clarain
C. Micrinite
D. Liptinite
Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?
A. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
B. Heat release rate (thus requiring smaller combustion chamber)
C. Adiabatic flame temperature
D. All A., B. and C.
A coal containing high amount of volatile matter will have__________________?
A. Low ignition temperature
B. High fusion point of its ash
C. Very little ash content
D. Low adiabatic flame temperature
High amount of sulphur and phosphorous in coke causes ____________________ ?
A. Increase in its strength
B. Decrease in its calorific value
C. Brittleness of steel made by using it
D. None of these
The calorific value of natural gas is about ______________ kcal/Nm3?
A. 10,000
B. 25,000
C. 2,500
D. 35,000
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than _______________ °C is liable to form clinker?
A. 1100
B. 1350
C. 1250
D. 1400
Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ?
A. Kerosene
B. Coal
C. Natural gas
D. Furnace oil
Which adsorbent is used for removing sulphur compounds (S Q, H2S, RSH etc.) removal from coke oven gas in by-products recovery plant ?
A. Diatomaceous earth
B. Silica gel
C. Basalt
D. Bog iron (i.e., moist ferric hydroxide)
Calorific value as determined by bomb calorimeter is the__________________?
A. Higher calorific value at constant volume
B. Lower calorific value at constant pressure
C. Gross calorific value at constant pressure
D. Net calorific value at constant volume
Calorific value of gobar gas (containing CH4 = 60% , H2 = 10% ; CO2 = 30%) may be about ______________ Kcal/Nm3?
A. 3,200
B. 1,800
C. 5,400
D. 10,200
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction ?
A. 2CO ↔ C + CO2
B. CO + H2O ↔ CO2 + H2
C. C + 2H2O ↔ CO2 + 2H2
D. C + H2O ↔ CO + H2
Coke oven gas compared to blast furnace gas is________________?
A. Less poisonous
B. More explosive and inflammable
C. Lighter
D. All A., B. and C.
Which of the following gaseous fuels is likely to have the highest gross calorific value ?
A. Producer gas
B. LPG
C. Sewage gas
D. Natural gas
Mineral matter content (M) and ash content A. in coal are approximately related as _______________?
A. M = 1.1A
B. M = 1.5A
C. M = A
D. M = 2A
Preheating of a gaseous fuel results in increased____________________?
A. Quantity of flue gas
B. Flame temperature
C. Flame length
D. Ignition temperature
Efficiency of the combustion of a fuel is judged by the ______________ the flue gas?
A. Temperature of
B. % of O2in
C. % of CO2 in
D. Colour of
Which of the following is not applicable to fluidised bed combustion of coal ?
A. It cannot burn low grade coal
B. Less heat transfer surface area is required in boilers
C. It achieves higher fuel combustion efficiency
D. None of these
With increase in calorific value of fuels, their adiabatic flame temperatures__________________?
A. Decrease
B. Increase
C. Remain unchanged
D. May increase or decrease; depends on the quantity of products of combustion