Latest Chemical Engineering MCQs – Competitive Fuels And Combustion MCQs
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Latest Chemical Engineering MCQs
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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:
C/H ratio is the maximum in case of_________________?
A. Coal
B. Natural gas
C. Furnace oil
D. Naphtha
Traces of tar fog present in the coke oven gas is removed by_________________?
A. Wet packed scrubber
B. Cyclone separator
C. Electrostatic precipitator
D. Washing with monoethanolamine
In general, the limit of inflammability/explosion limit of fuel gases is widened by the__________________?
A. Use of pure oxygen for combustion instead of air
B. Increase in temperature (i.e. preheating)
C. Increase in gas pressure
D. All A., B. & C.
With increase in moisture content of coal, its___________________?
A. Swelling during carbonisation becomes excessive
B. Caking properties diminish
C. Calorific value increases
D. None of these
Coke oven gas burns with a yellowish flame, because of the presence of __________________?
A. H2
B. CH4
C. CO2
D. NH3
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ______________°C?
A. 70
B. 145
C. 105
D. 85
Supply of excess air for complete combustion of fuel is necessitated to facilitate___________________?
A. Its thorough mixing with air
B. Attainment of high temperature
C. Attainment of chemical equilibrium
D. None of these
Combustion of pulverised coal compared to the lumpy coal __________________?
A. Facilitates combustion with lower excess air
B. Provides better control of furnace temperature
C. Provides higher thermal efficiency & flame temperature
D. All A., B. & C.
High rate of heating of coke ovens____________________?
A. May damage its walls due to abrupt excessive swelling of coal
B. Increases the time of carbonisation
C. Produces larger size coke
D. None of these
Low temperature oxidation of stored coal results in the________________?
A. Decrease in its carbon & hydrogen content
B. Decrease in its caking power & calorific value
C. Increase in its oxygen content
D. All A., B. and C.
High sulphur content in a fuel ______________ of the flue gases?
A. Decreases the dew point
B. Reduces the combustion efficiency by limiting the permissible temperature reduction
C. Increases the dew point
D. Both B. and C.
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?
A. Vitrain
B. Durain
C. Clarain
D. Fussain
Which will have the least volatile matter and hence will be the most difficult to ignite ?
A. Anthracite
B. Coke
C. Semi-bituminous coal
D. Bituminous coal
Number of macrocomponents present in coal according to Stopes are ___________________?
A. Four
B. Six
C. Five
D. Two
Weathering of coal during storage causes_______________?
A. Increase in its friability
B. Reduction in coal size
C. Decrease in its caking capacity
D. All A., B. and C.
The main function of primary air in pulverised coal fired burner is to_________________?
A. Have proper combustion by supplying it around the burner
B. Dry and transport the coal
C. Burn CO to CO2
D. Preheat the tertiary air used for complete combustion of CO to CO2
Which of the following has the highest calorific value (kcal/Nm3) ?
A. Gobar gas
B. Carburetted water gas
C. Natural gas
D. LPG
Chemical Process Mcqs
Blast furnace gas compared to coke oven gas has_________________?
A. Higher calorific value
B. Narrower limit of inflammability
C. Lower ignition temperature
D. Lower theoretical flame temperature
Which of the following is a poisonous fuel gas ?
A. Natural gas
B. Blast furnace gas
C. Coke oven gas
D. None of these
Use of preheated air for combustion of fuel in the furnace, increases the___________________?
A. Scale losses of the furnace stock
B. Calorific value of the fuel
C. Flame temperature
D. None of these
Which of the following is unsuitable fuel for producer gas manufacture ?
A. Anthracite
B. Coke
C. Coal having low fusion point of its ash
D. Coal having high fusion point of its ash
A coal having higher volatile matter content, has lower_________________?
A. Coke oven gas yield on carbonisation
B. Smoking tendency on burning
C. Chance of catching fire during storage in open space
D. Ignition temperature
Caking coal is desirable for_________________?
A. Burning on firebars
B. Coke making
C. Burning on travelling grate
D. All A., B. and C.
Coals used for the generation of producer gas should have ____________________?
A. Low fusion point of ash
B. High caking index
C. High volatile matter content
D. Very low ash content (8-10%)
Coke having higher porosity has ___________________?
A. Lower strength
B. Lower bulk density
C. Higher reactivity
D. All A., B. and C.
Out of the following, which is the most important parameter for the blast furnace grade coke ?
A. CSR & CRI
B. Moisture content
C. Ash content
D. Volatile matter content
Artificial draught produced by a fan can be controlled by the___________________?
A. Damper
B. Speed of the fan
C. Variation in the pitch of the fan blades
D. All A., B. and C.
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?
A. Wet scrubber
B. Bag filter
C. Multicyclones
D. Hydrocyclones
In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?
A. Free carbon in tar is more
B. Aliphatic tar is produced
C. Ammonia yield is more
D. All A., B. and C.
Tar is a better fuel than furnace oil, because of its___________________?
A. Lower sulphur content
B. Higher calorific value
C. Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate
D. Both A. and B.
__________ is used as jet engine fuel ?
A. Diesel
B. Petrol
C. Kerosene
D. LPG
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in___________________?
A. Oxygen
B. Air
C. Either A. or B.
D. Either A. or B. without gain or loss of heat
Low temperature oxidation of coal during storage does not decrease its__________________?
A. Caking power
B. Oxygen content
C. Calorific value
D. None of these
Calorific value of a typical dry anthracite coal may be around _____________ Kcal/kg?
A. 4000
B. 1000
C. 8000
D. 15000
The catalyst used in shift converter is _____________________?
A. Nickel
B. Silica gel
C. Vanadium
D. Alumina
With increase in the temperature of carbonisation of coal ___________________?
A. Methane content in the coke oven gas decreases and carbon monoxide content increases
B. Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
C. Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H2 content
D. All A., B. and C.
Volatile matter content in coking coal may be about _____________ percent?
A. 7
B. 1
C. 22
D. 46
The maximum adiabatic flame temperature is attained, when the fuel is burnt with ______________________?
A. Less than theoretically required amount of air
B. More than theoretically required amount of air
C. Theoretically required amount of air
D. Theoretically required amount of oxygen
Fertilizer Technology Mcqs
Atomising steam to fuel oil ratio in a burner should be around__________________?
A. 0.5
B. 2.5
C. 1.5
D. 3.5
Gobar gas is produced by the _______________ of ‘gobar’ (cow dung) ?
A. Oxidation
B. Fermentation
C. Hydrolysis
D. Dehydration
Percentage of methane in coke oven gas may be around _____________________?
A. 15
B. 5
C. 25
D. 50
A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?
A. 21% excess oxygen has been used for combustion
B. 21% excess air has been used for combustion
C. Complete combustion of fuel has taken place
D. No excess air has been used for combustion
Which of the following combustibles is absent in blast furnace gas ?
A. CO
B. CH4
C. H2
D. None of these
Tolerable concentration of toxic carbon monoxide in atmospheric air is about ______________ ppm?
A. 50
B. 5000
C. 1000
D. 10000
Higher fuel combustion efficiency cannot be achieved by_________________?
A. Supplying correct amount of combustion air
B. Reducing sulphur content in the fuel
C. Adopting proper fuel firing technique & fuel preparation
D. Preheating of fuel gases & combustion air
A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________?
A. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74
B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
C. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06
D. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
Softening temperature of coal ash is a measure of the _____________ of coal?
A. Coking tendency
B. Caking tendency
C. Clinkering tendency
D. Size stability
Calorific value of coke even gas produced by low temperature carbonisation of coal is about ____________ Kcal/Nm3?
A. 2500
B. 4000
C. 6500
D. 10000
During combustion of coal on grate, clinker formation is increased by the___________________?
A. Use of preheated primary air
B. Low fusion point of ash (< 1100° C)
C. Use of thick fire bed
D. All A., B. & C.
Short/intense flame is produced during combustion of gaseous fuel by using________________?
A. High amount/current of combustion air
B. Preheated secondary air
C. Low amount/current of combustion air
D. Very little excess air
The calorific value of producer gas is around _____________ kcal/Nm3?
A. 1300
B. 4500
C. 500
D. 9000
Which is the heaviest fuel gas out of the following ?
A. Blast furnace gas
B. Water gas
C. Coke oven gas
D. Carburetted water gas
Presence of phosphorous in metallurgical coal__________________?
A. Reduces its calorific value
B. Is not undesirable
C. Badly affects the quality of steel
D. Increases its caking power
The reaction, C + CO2 ↔ 2CO, taking place during coal gasification is called the ______________ reaction?
A. Shift conversion
B. Neumann reversal
C. Boudouard
D. Reduction
Which of the following petrographic constituents of coal is non-coking ?
A. Clarain
B. Vitrain
C. Durain
D. Fussain
Power alcohol as compared to straight run gasoline has lower ________________?
A. Calorific value
B. Specific gravity
C. Octane number
D. Viscosity
Abrasion index of blast furnace coke should be around _____________ percent?
A. 20
B. 55
C. 35
D. 80
Fuels And Combustion Mcqs
The calorific value of L.D. converter gas is about ____________ Kcal/Nm3?
A. 1800
B. 4500
C. 800
D. 10000
Which of the following has the highest heat of combustion ?
A. CO
B. H2
C. CH4
D. C2H6
Initial pressure of oxygen introduced into the ‘bomb’ of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around _____________ atm?
A. 60-65
B. 25-30
C. 3-5
D. 95-100
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?
A. CO
B. H2O
C. CO2
D. Both B. & C.
Which of the following has the highest calorific value ?
A. Sub-bituminous coal
B. Lignite
C. Anthracite
D. Peat
Octane number of 2, 2, 4 – trimethyl pentane is __________________?
A. In between 0 and 100
B. 100
C. 0
D. More than 100
Naphthalene is removed from coke oven gas by________________?
A. Scrubbing with wash oil (a petroleum product)
B. Absorbing in vetro-coke solution
C. Adsorbing on bog iron bed
D. None of these
‘Fat’ coal means a coal having ___________________?
A. Low ash content
B. High volatile matter
C. Low calorific value
D. Non smoking tendency
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?
A. 10 & 20
B. 10 & 3
C. 3 & 10
D. 15 & 8
Hardgrove Grindability index of four coal samples are given below. Which of them is the easiest to grind ?
A. 70
B. 50
C. 85
D. 100
Yield of pitch from distillation of high temperature tar is around _____________ percent?
A. 25
B. 10
C. 65
D. 90
The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be_________________?
A. 21
B. 79
C. 77
D. 29
Proximate analysis of coal determines its ______________ content?
A. Moisture, sulphur, nitrogen & fixed carbon
B. Moisture, volatile matter, ash & fixed carbon
C. Moisture, ash, sulphur & volatile matter
D. None of these