MCQOPTIONS
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MCQOPTIONS
This section includes 1154 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 951. |
Presence of nitrogen in combustion air does not reduce the |
| A. | amount of heat liberated. |
| B. | flame temperature. |
| C. | flue gas temperature. |
| D. | any of the above. |
| Answer» B. flame temperature. | |
| 952. |
Gobar gas is produced by the __________ of 'gobar' (cow dung). |
| A. | hydrolysis |
| B. | fermentation |
| C. | oxidation |
| D. | dehydration |
| Answer» C. oxidation | |
| 953. |
Coke oven gas compared to blast furnace gas is |
| A. | more explosive and inflammable. |
| B. | less poisonous. |
| C. | lighter. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 954. |
A good metallurgical coke should have very low |
| A. | sulphur & phosphorous content |
| B. | porosity |
| C. | fusion point of its ash |
| D. | hardness & strength |
| Answer» B. porosity | |
| 955. |
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 956. |
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent. |
| A. | 80 and 97 |
| B. | 95 and 100 |
| C. | 40 and 70 |
| D. | 25 and 97 |
| Answer» B. 95 and 100 | |
| 957. |
Bright coal |
| A. | contains more than 90% durain. |
| B. | contains more than 90% fussain. |
| C. | contains mainly vitrain & clarain and is generally coking. |
| D. | is non-coking. |
| Answer» D. is non-coking. | |
| 958. |
Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces |
| A. | higher amount of methane. |
| B. | lower amount of hydrogen. |
| C. | both (a) and (b). |
| D. | higher amount of both methane and hydrogen. |
| Answer» D. higher amount of both methane and hydrogen. | |
| 959. |
Volumetric ratio of N2 to O2 in dry atmospheric air is |
| A. | 0.21 |
| B. | 3.76 |
| C. | 4.76 |
| D. | 0.79 |
| Answer» C. 4.76 | |
| 960. |
One kg of carbon for theoretically complete combustion requires __________ kg of air. |
| A. | 11.5 |
| B. | 0.5 |
| C. | 23 |
| D. | 12 |
| Answer» B. 0.5 | |
| 961. |
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is |
| A. | 20 |
| B. | 12.5 |
| C. | 0 |
| D. | 10 |
| Answer» D. 10 | |
| 962. |
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. | 85 |
| C. | 105 |
| D. | 145 |
| Answer» D. 145 | |
| 963. |
Combustion of pulverised coal compared to the lumpy coal |
| A. | provides better control of furnace temperature. |
| B. | facilitates combustion with lower excess air. |
| C. | provides higher thermal efficiency & flame temperature. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 964. |
(64-132) rank coal (ASTM) means a coal with 64% |
| A. | fixed carbon and having a heating value around 13, 200 BTU/1b. |
| B. | ash and heating value around 13, 200 BTU/1b. |
| C. | fixed carbon and heating value around 132 BTU/1b. |
| D. | none of these. |
| Answer» B. ash and heating value around 13, 200 BTU/1b. | |
| 965. |
The heat of combustion of a fuel |
| A. | is equal to the heat of formation. |
| B. | is always negative. |
| C. | can't be known without calculating it. |
| D. | is always positive. |
| Answer» C. can't be known without calculating it. | |
| 966. |
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of |
| A. | coke oven gas |
| B. | water gas |
| C. | natural gas |
| D. | blast furnace gas |
| Answer» E. | |
| 967. |
Ultimate analysis of coal determines its __________ content. |
| A. | carbon, hydrogen, nitrogen & sulphur. |
| B. | carbon, ash, sulphur & nitrogen. |
| C. | carbon, sulphur, volatile matter & ash. |
| D. | carbon, volatile matter, ash & moisture. |
| Answer» B. carbon, ash, sulphur & nitrogen. | |
| 968. |
Very __________ coals are completely devoid of cokability i.e, it is non coking. |
| A. | young |
| B. | mature |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 969. |
Calorific value of wood gas is about __________ kcal/Nm3. |
| A. | 1500 |
| B. | 3300 |
| C. | 5400 |
| D. | 8500 |
| Answer» C. 5400 | |
| 970. |
'Fuel' can be defined as a substance which produces heat by |
| A. | combustion. |
| B. | nuclear fission. |
| C. | nuclear fusion. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 971. |
Calorific value as determined by bomb calorimeter is the |
| A. | higher calorific value at constant volume. |
| B. | gross calorific value at constant pressure. |
| C. | lower calorific value at constant pressure. |
| D. | net calorific value at constant volume. |
| Answer» B. gross calorific value at constant pressure. | |
| 972. |
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter. |
| A. | bomb |
| B. | Boy's |
| C. | Junkar's |
| D. | none of these |
| Answer» B. Boy's | |
| 973. |
Caking index of a coal is a measure of its |
| A. | abradability |
| B. | reactivity |
| C. | agglutinating (binding) properties |
| D. | porosity |
| Answer» D. porosity | |
| 974. |
Caking index of coal blend used for blast furnace coke making is about |
| A. | 8 |
| B. | 12 |
| C. | 22 |
| D. | 36 |
| Answer» D. 36 | |
| 975. |
Purity of coke means that, it is high in carbon and low in |
| A. | volatiles |
| B. | ash |
| C. | iron |
| D. | moisture |
| Answer» B. ash | |
| 976. |
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm. |
| A. | 50 |
| B. | 1000 |
| C. | 5000 |
| D. | 10000 |
| Answer» B. 1000 | |
| 977. |
Which of the following is not a micro component present in coal ? |
| A. | Micrinite |
| B. | Clarain |
| C. | Fusinite |
| D. | Liptinite |
| Answer» C. Fusinite | |
| 978. |
Calorific value of furnace oil is about __________ Kcal/kg. |
| A. | 10000 |
| B. | 15000 |
| C. | 5000 |
| D. | 20000 |
| Answer» B. 15000 | |
| 979. |
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 + H2O CO + H2 |
| D. | C + 2H2O CO2 + 2H2 |
| Answer» B. CO + H2O CO2 + H2 | |
| 980. |
Preheating of coal charge for the coke ovens reduces the |
| A. | time of carbonisation. |
| B. | yield of gas and tar. |
| C. | fuel consumption in coking. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 981. |
Safe condition for storage of high V.M. bituminous coal is that |
| A. | height of the coal heap should be < 3 metres. |
| B. | maximum 200 tons should be stored in a heap. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 982. |
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its |
| A. | caking power |
| B. | calorific value |
| C. | hydrogen content |
| D. | oxygen content |
| Answer» E. | |
| 983. |
Coal containing large quantity of __________ are difficult to wash. |
| A. | ash |
| B. | inherent mineral matter |
| C. | free impurities |
| D. | volatile matter |
| Answer» C. free impurities | |
| 984. |
Dry air required to burn 1 kg of carbon completely may be around __________ kg. |
| A. | 11 |
| B. | 2 |
| C. | 20 |
| D. | 38 |
| Answer» B. 2 | |
| 985. |
Actual flame temperature is always lower than the adiabatic flame temperature, because there is |
| A. | no possibility of obtaining complete combustion at high temperature. |
| B. | always loss of heat from the flame. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 986. |
Combustion reaction of fuels is a/an __________ reaction. |
| A. | auto catalytic |
| B. | exothermic |
| C. | endothermic |
| D. | none of these |
| Answer» C. endothermic | |
| 987. |
The shift conversion reaction taking place during water gas manufacture is given by |
| A. | C + H2O CO + H2 |
| B. | C + 2H2O CO2 + 2H2 |
| C. | CO + H2O CO2 + H2 |
| D. | none of these |
| Answer» D. none of these | |
| 988. |
A travelling grate stoker is meant for the efficient burning of __________ coal. |
| A. | caking |
| B. | pulverised |
| C. | non-caking |
| D. | high ash |
| Answer» D. high ash | |
| 989. |
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its |
| A. | caking index. |
| B. | yield of carbonised products. |
| C. | friability & oxygen content. |
| D. | calorific value. |
| Answer» D. calorific value. | |
| 990. |
Which of the following accentuates clinker-ing trouble on furnace grate burning coal ? |
| A. | Low reactivity of carbonised residue containing high proportions of iron & sulphur. |
| B. | Low forced draught and fuel bed temperature. |
| C. | Thick fire bed and preheated primary air. |
| D. | All (a), (b) and (c). |
| Answer» E. | |
| 991. |
Hard pitch is used for making |
| A. | pulverised fuel |
| B. | perfumes |
| C. | insecticides |
| D. | plastics |
| Answer» B. perfumes | |
| 992. |
Power alcohol as compared to straight run gasoline has lower |
| A. | calorific value |
| B. | octane number |
| C. | specific gravity |
| D. | viscosity |
| Answer» B. octane number | |
| 993. |
The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorifice value will be |
| A. | y |
| B. | 0.95 y |
| C. | 1.05 y |
| D. | 1.8 y |
| Answer» B. 0.95 y | |
| 994. |
A good quality coal should have |
| A. | low fusion point of ash |
| B. | high ash content |
| C. | high sulphur |
| D. | none of these |
| Answer» E. | |
| 995. |
C/H ratio is the maximum in case of |
| A. | coal |
| B. | furnace oil |
| C. | natural gas |
| D. | naphtha |
| Answer» B. furnace oil | |
| 996. |
Moisture loss is determined by the |
| A. | humidity of combustion air. |
| B. | moisture content of fuel. |
| C. | both (a) and (b). |
| D. | the water formed by combustion reaction. |
| Answer» D. the water formed by combustion reaction. | |
| 997. |
Main constituent of the gas produced from a gobar gas plant is |
| A. | CO2 |
| B. | CH4 |
| C. | H2 |
| D. | CO |
| Answer» C. H2 | |
| 998. |
Bituminous coal |
| A. | ignites less easily than anthracite. |
| B. | is generally coking. |
| C. | burns with smoky yellow flame. |
| D. | both (b) and (c). |
| Answer» E. | |
| 999. |
Which of the following fuels is the best for burning on chain grate stoker ? |
| A. | Non-caking coal |
| B. | Caking coal |
| C. | Coking coal |
| D. | Pulverised coal. |
| Answer» B. Caking coal | |
| 1000. |
The gas which contributes maximum to the heating value of natural gas is |
| A. | CO |
| B. | CO2 |
| C. | H2 |
| D. | CH4 |
| Answer» E. | |