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Up To Date Fuels And Combustion MCQs – New Chemical Engineering MCQs

Up To Date Fuels And Combustion MCQs – New Chemical Engineering 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:

Low temperature carbonisation of coal takes place at ______________ °C?

A. 1100
B. 300
C. 700
D. 150

Prime coking coal is always blended with medium or non- coking coal before carbonisation__________________?

A. Because, it alone produces unreactive coke
B. To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
C. Both A. and B.
D. Neither A. nor B.

Which of the following is not a manufactured fuel ?

A. Kerosene
B. Bagasse
C. Semi-coke
D. Furnace oil

In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the______________?

A. Tar yield is more
B. Gas yield is less
C. Ignition temperature of coke produced is less
D. Aromatic content of tar produced is more

Grindability index of a coal is 100. It implies that the ___________________?

A. Coal can’t be pulverised
B. Coal can be pulverised with great difficulty
C. Coal can be easily pulverised
D. Power consumption in grinding the coal will be very high

Naphthalene recovered from coke oven gas is used___________________?

A. As a fuel in furnaces
B. As moth balls (insecticides)
C. As moisture proof coating on fibres
D. For making electrodes

When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?

A. O2
B. CO
C. CO2
D. C

One kg of carbon for theoretically complete combustion requires ______________ kg of air?

A. 11.5
B. 23
C. 0.5
D. 12

____________ process is meant for direct hydrogenation of coal to produce liquid fuel?

A. Lurgi
B. Bergius
C. Fischer-Tropsch
D. None of these

During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?

A. High oxygen in flue gas
B. Complete combustion
C. Incomplete combustion
D. None of these

If oxygen content in the flue gas rises too high, fuel is being wasted by _______________?

A. Moisture loss
B. Dry gas/stack gas loss
C. Incomplete combustion
D. None of these

Higher efficiency in the combustion of solid fuel cannot be achieved by________________?

A. Adopting efficient-fuel firing technique & equipment
B. Keeping the flue gas exhaust temperature very high
C. Proper fuel preparation
D. Supplying correct quantity of combustion air

Ultimate analysis of coal determines its _______________ content?

A. Carbon, hydrogen, nitrogen & sulphur
B. Carbon, sulphur, volatile matter & ash
C. Carbon, ash, sulphur & nitrogen
D. Carbon, volatile matter, ash & moisture

A particular coal is said to be free burning when it __________________?

A. Gives smokeless burning
B. Burns completely
C. Shows little or no fusing action
D. None of these

Critical Air Blast (CAB) value of coke is a direct measure of its__________________?

A. Reactivity
B. Strength
C. Hardness
D. None of these

Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?

A. Yield of carbonised products
B. Caking index
C. Friability & oxygen content
D. Calorific value

Fertilizer Technology Mcqs

The sequence of absorption in flue gas analysis by Orsat’s apparatus is respectively_______________________?

A. CO2, O2, CO
B. CO2, CO, O2
C. CO, O2, CO2
D. O2, CO2, CO

Sometimes water is sprayed during coal charging in the coke oven, which helps in ________________?

A. Controlling the dust nuisance while charging the coal
B. Prevention of clinker formation in the oven
C. Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)
D. All A., B. and C.

Coal tar fuel – 200 (CTF 200) is a mixture of __________________?

A. Pitch and creosote oil
B. Anthracene and crecosote oil
C. Light oil and pitch
D. Solar oil and pitch

During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?

A. Density
B. Electrical resistivity
C. Porosity
D. None of these

Combustion of pulverised coal as compared to that of lump coal ________________?

A. Develops a low temperature flame
B. Develops a non-luminous flame
C. Can be done with less excess air
D. Provides a lower rate of heat release

Calorific value of dry wood may be around ______________ Kcal/kg?

A. 5
B. 500
C. 50
D. 5000

Mineral matter, ‘M’ and ash percentage ‘A’ in coal are roughly related as_______________?

A. M = 0.5 A
B. M = 1.8 A
C. M = 1.1 A
D. M = A

Flue gas from the heating chamber of by product coke ovens is removed by________________?

A. Induced draft fan
B. Forced draft fan
C. Steam ejector
D. Natural draft

Safe condition for storage of high V.M. bituminous coal is that ___________________?

A. Maximum 200 tons should be stored in a heap
B. Height of the coal heap should be < 3 metres
C. Both A. and B.
D. Neither A. nor B.

Which of the following is used for making the explosive „TNT‟ ?

A. Pyridine
B. Toluene
C. Benzol
D. Cerosote

Chemical Process Mcqs

Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?

A. CO content
B. CO2 content
C. Dew point
D. O2 content

Producer gas containing least amount of tar is produced by the_________________?

A. High pressure gasification of coal (e.g. in Lurgi gasifier)
B. Partial combustion of large size (< 50 mm) coke
C. Partial combustion of coal
D. Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)

Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about ______________ °C?

A. 120
B. 65
C. 30
D. 180

The function of secondary combustion air is to ______________________?

A. Burn the lumpy coal
B. Completely burn the volatile matter
C. Pneumatically convey the pulverised coal
D. None of these

A coal containing very high percentage of durain is called ______________ coal?

A. Non-banded
B. Splint
C. Bright
D. Boghead

By-products are _____________ recovered in ‘Beehive ovens’ ?

A. Partially
B. Fully
C. Not at all
D. Negligibly

Anthracite coal ____________________?

A. Ignites more easily than bituminous coal
B. Contains more volatile matter than bituminous coal
C. Is essentially a coking coal
D. Burns with short, bluish, yellow-tipped flame producing very little smoke

Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called_________________?

A. Under pressurising
B. Banking
C. Back draughting
D. None of these

Stack heat losses can be minimised by________________?

A. Controlling the excess air
B. Using low c.v. fuels
C. Oxygen enrichment of combustion air
D. Maintaining proper draft in the furnace

Calorific value of bituminous coal may be around ______________ Kcal/kg?

A. 1500
B. 500
C. 6500
D. 20000

Calorific values of both the solid as well as the liquid fuels can be determined by ______________ calorimeter?

A. Bomb
B. Junkers
C. Boy’s
D. None of these

Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?

A. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B. It reduces its flame temperature tremendously
C. It reduces its calorific value tremendously
D. There are chances of explosion during preheating

Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?

A. 25000 kcal/kg
B. 8800 kcal/kg
C. Same as that of coal middling
D. 8800 kcal/m3

Blast furnace gas burns with a bluish flame, because of the presence of____________________?

A. CO
B. CO2
C. CH4
D. S

Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?

A. 500
B. 160
C. 60
D. 750

Orsat apparatus is meant for ___________________?

A. Finding out combustion efficiency
B. Gravimetric analysis of flue gas
C. Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
D. None of these

The combustion reaction, C + O2 = CO2, is ___________________?

A. Exothermic
B. Autocatalytic
C. Endothermic
D. None of these

Mechanical Operations Mcqs

Which of the following constituents of coal is the most important in the production of coke ?

A. Ash
B. Moisture
C. Volatiles
D. Carbon

The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?

A. Mineral oil of high viscosity & specific gravity (1.6)
B. Sand (40%)
C. Carbon tetrachloride
D. None of these

Quantity of coke produced from metallurgical coal may be around _____________ percent?

A. 50
B. 30
C. 75
D. 95

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?

A. 31%
B. 71%
C. In between 37 & 71%
D. None of these

Fussain _____________________?

A. Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
B. Is friable, charcoal like substance
C. Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
D. All A., B. and C.

Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?

A. Hydrogenation
B. Carbonisation
C. Gasification
D. None of these

Gross and net calorific value of a fuel will be the same__________________?

A. If its carbon content is very low
B. If its ash content is zero
C. If its hydrogen/hydrogen compound content is zero
D. Under no circumstances

Beehive coke oven________________?

A. Produces coke with very poor strength
B. Takes 2-3 days for coking of coal but requires no external fuel for heating
C. Gives larger yield of coke (around 85%) as compared to by-product ovens
D. Facilitates by-products recovery

Coal is heated in presence of air to a temperature of about _______________ °C, while determining its ash content for proximate analysis?

A. 950
B. 750
C. 500
D. 1100

Higher percentage of ash in coal meant for the production of metallurgical grade coke ___________________?

A. Causes brittleness in steel
B. Decreases the abrasion resistance of coke
C. Decreases the hardness of coke
D. None of these

Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _____________________?

A. MgO & Na2CO3
B. BaSO4 & NaCl
C. MgSO4 & BaCl2
D. MgCO3 & NaCl

Ignition temperature of a fuel in air is ______________ that in pure oxygen?

A. More than
B. Equal to
C. Less than
D. Either more or less; depends on the type of fuel

Which of the following gaseous fuels has the lowest calorific value ?

A. Refinery gas
B. Gobar gas
C. Converter gas
D. Blast furnace gas

Turndown ratio of a gas burner is equal to the __________________ ?

A. Maximum to minimum permissible gas flow rate
B. Maximum to minimum heat input ratio
C. Both A. & B.
D. Minimum to maximum heat input ratio

Which of the following has the least calorific value (kcal/Nm3) ?

A. Blast furnace gas
B. Sewage gas
C. Coke oven gas
D. Natural gas

Carbon Content by weight in air dried wood may be about _______________ percent?

A. 25
B. 10
C. 50
D. 80

Pick the odd man out?

A. Oil gas
B. Wood
C. Briquettes
D. Pitch creosote mixture

Pick out the wrong statement ?

A. Gaseous fuels require the least % excess air for complete combustion
B. High concentration of oxygen in flue gas means high stack loss
C. The ratio of fixed carbon to volatile matter percentage in coal is called its ‘fuel ratio’
D. Calorific value of natural gas is more than that of LPG

Pick out the wrong statement ?

A. Maximum yield of naphthalene is obtained on distillation of crude
B. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point
C. Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas
D. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals 

Up To Date Fuels And Combustion MCQs – New Chemical Engineering MCQs