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.
| 851. |
A coal with high ash content |
| A. | has higher calorific value. |
| B. | is harder and stronger. |
| C. | is not subjected to washing. |
| D. | has low quantity of mineral matter. |
| Answer» C. is not subjected to washing. | |
| 852. |
During its calorific value determination by bomb calorimeter, coal is combusted by |
| A. | air |
| B. | oxygen |
| C. | oxygen enriched air |
| D. | none of these |
| Answer» C. oxygen enriched air | |
| 853. |
As time passes, the calorific value of stored coal |
| A. | decreases |
| B. | increases |
| C. | remains unaltered |
| D. | may increase or decrease (depends on the method of storage). |
| Answer» B. increases | |
| 854. |
Use of excess of combustion air in the combustion of fuels results in |
| A. | heat losses. |
| B. | long flame. |
| C. | condensation of water vapour from the fuel gas. |
| D. | none of these. |
| Answer» B. long flame. | |
| 855. |
Low temperature oxidation of stored coal results in the |
| A. | decrease in its caking power & calorific value. |
| B. | decrease in its carbon & hydrogen content. |
| C. | increase in its oxygen content. |
| D. | all (a), (b) and (a). |
| Answer» E. | |
| 856. |
The fuel ratio of a coal is |
| A. | the ratio of its percentage of fixed carbon to that of volatile matter. |
| B. | helpful in estimation of its rank. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 857. |
With increase in the oxygen content of the coal, its __________ decreases. |
| A. | calorific value |
| B. | caking power |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 858. |
Lignite is |
| A. | a high rank coal. |
| B. | a coking coal. |
| C. | can be used for gasification and steam generation. |
| D. | a black banded coal which burns with a non-smoky yellowish flame. |
| Answer» D. a black banded coal which burns with a non-smoky yellowish flame. | |
| 859. |
__________ is used as jet engine fuel. |
| A. | Petrol |
| B. | Diesel |
| C. | Kerosene |
| D. | LPG |
| Answer» D. LPG | |
| 860. |
Advantages of fluidised bed combustion are |
| A. | reduced NOx formation in flue gas. |
| B. | lower furnace operating temperature. |
| C. | high heat transfer rate. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 861. |
Yield of pitch from distillation of high temperature tar is around __________ percent. |
| A. | 10 |
| B. | 25 |
| C. | 65 |
| D. | 90 |
| Answer» D. 90 | |
| 862. |
Blast furnace gas constitutes mainly of |
| A. | N2 & CH4 |
| B. | N2 & H2 |
| C. | N2 & CO |
| D. | CH4 & CO2 |
| Answer» D. CH4 & CO2 | |
| 863. |
The main advantage of forced draft over natural draft is that |
| A. | combustion of fuel is complete. |
| B. | smaller height chimney can be used. |
| C. | furnace control is easier. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 864. |
High ash containing coke |
| A. | produces more slag when used in the blast furnace. |
| B. | has poor strength and abrasion resistance. |
| C. | is desirable in producer gas manufacture. |
| D. | none of these. |
| Answer» B. has poor strength and abrasion resistance. | |
| 865. |
For long flame and easy ignition, the coal used should have |
| A. | high volatile matter |
| B. | low ash |
| C. | high calorific value |
| D. | high ash |
| Answer» B. low ash | |
| 866. |
'Mixed gas' used in steel plants is a mixture of |
| A. | B.F. gas and coke oven gas. |
| B. | coke oven gas and converter gas. |
| C. | coke oven gas and L.P.G. |
| D. | blast furnace gas and naphtha vapor. |
| Answer» B. coke oven gas and converter gas. | |
| 867. |
Coal tar fuel - 200 (CTF 200) is a mixture of |
| A. | pitch and creosote oil. |
| B. | light oil and pitch. |
| C. | anthracene and crecosote oil. |
| D. | solar oil and pitch. |
| Answer» B. light oil and pitch. | |
| 868. |
Washing of coal does not reduce its |
| A. | S & P content. |
| B. | heating value. |
| C. | fusion point of ash. |
| D. | none of these. |
| Answer» E. | |
| 869. |
Soft coke is not |
| A. | produced by low temperature carbonisation of coal. |
| B. | a domestic fuel. |
| C. | used in blast furnaces. |
| D. | none of these. |
| Answer» D. none of these. | |
| 870. |
About __________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO. |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 1 |
| Answer» D. 1 | |
| 871. |
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively |
| A. | CO2, O2, CO |
| B. | CO, O2, CO2 |
| C. | CO2, CO, O2 |
| D. | O2, CO2, CO |
| Answer» B. CO, O2, CO2 | |
| 872. |
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. | adiabatic flame temperature. |
| C. | heat release rate (thus requiring smaller combustion chamber). |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 873. |
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by |
| A. | cuprous chloride |
| B. | potassium hydroxide |
| C. | alkaline pyrogallol solution |
| D. | none of these. |
| Answer» B. potassium hydroxide | |
| 874. |
Which of the following has the highest flame speed ? |
| A. | CO |
| B. | H2 |
| C. | CH4 |
| D. | C2H6 |
| Answer» C. CH4 | |
| 875. |
Percentage of carbon monoxide in blast furnace gas may be around |
| A. | 8 |
| B. | 14 |
| C. | 22 |
| D. | 52 |
| Answer» D. 52 | |
| 876. |
Grindability index of a coal is 100. It implies that the |
| A. | coal can be pulverised with great difficulty. |
| B. | coal can't be pulverised. |
| C. | coal can be easily pulverised. |
| D. | power consumption in grinding the coal will be very high. |
| Answer» D. power consumption in grinding the coal will be very high. | |
| 877. |
Fuel combustion is never cent per cent efficient due to |
| A. | incomplete combustion |
| B. | dry gas/stack gas loss |
| C. | moisture loss |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 878. |
Which of the following is a poisonous fuel gas? |
| A. | Coke oven gas |
| B. | Blast furnace gas |
| C. | Natural gas |
| D. | None of these |
| Answer» C. Natural gas | |
| 879. |
The combustion reaction, C + O2 = CO2, is |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | none of these |
| Answer» B. endothermic | |
| 880. |
The cuprous chloride used in orsat apparatus can absorb |
| A. | only CO |
| B. | both CO and CO2 |
| C. | both CO and O2 |
| D. | all CO, CO2, and O2. |
| Answer» E. | |
| 881. |
Which of the following has the least calorific value (kcal/Nm3) ? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Sewage gas |
| D. | Natural gas |
| Answer» B. Coke oven gas | |
| 882. |
Mott and Wheeler test is conducted on coke to find its |
| A. | reactivity with O2. |
| B. | abradability. |
| C. | phosphorus content. |
| D. | volatile matter content. |
| Answer» B. abradability. | |
| 883. |
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. | presence of large quantity of hydrogen in the fuel. |
| B. | low calorific value of the fuel. |
| C. | high sulphur content in the fuel. |
| D. | lack of thorough mixing of fuel with air. |
| Answer» E. | |
| 884. |
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. | air |
| B. | oxygen |
| C. | either (a) or (b) |
| D. | either (a) or (b) without gain or loss of heat |
| Answer» E. | |
| 885. |
Abrasion index of blast furnace coke should be around __________ percent. |
| A. | 20 |
| B. | 35 |
| C. | 55 |
| D. | 80 |
| Answer» E. | |
| 886. |
During combustion of coal on grate, clinker formation is increased by the |
| A. | use of thick fire bed. |
| B. | low fusion point of ash (< 1100° C). |
| C. | use of preheated primary air. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 887. |
Largest constituent of blast furnace gas is |
| A. | N2 |
| B. | CO |
| C. | CO2 |
| D. | H2 |
| Answer» B. CO | |
| 888. |
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen. |
| A. | 1kg mole |
| B. | 22.4 Nm3 |
| C. | 32 kg |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 889. |
When the coal is heated in absence of air, it is called its |
| A. | deoxidation |
| B. | gasification |
| C. | coalification |
| D. | carbonisation |
| Answer» E. | |
| 890. |
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent. |
| A. | 4 |
| B. | 96 |
| C. | 20 |
| D. | 40 |
| Answer» D. 40 | |
| 891. |
Which of the following is a lean fuel gas ? |
| A. | Coke oven gas |
| B. | LPG |
| C. | Blast furnace gas |
| D. | Natural gas |
| Answer» D. Natural gas | |
| 892. |
High rate of heating of coke ovens |
| A. | may damage its walls due to abrupt excessive swelling of coal. |
| B. | produces larger size coke. |
| C. | increases the time of carbonisation. |
| D. | none of these. |
| Answer» B. produces larger size coke. | |
| 893. |
Low temperature carbonisation of coal produces |
| A. | metallurgical coke |
| B. | soft coke |
| C. | very low calorific value coke oven gas |
| D. | no by-products |
| Answer» C. very low calorific value coke oven gas | |
| 894. |
Coalification means the |
| A. | process of conversion of lignite into anthracite. |
| B. | underground gasification of coal. |
| C. | complete combustion of coal. |
| D. | direct hydrogenation of coal. |
| Answer» B. underground gasification of coal. | |
| 895. |
Washing of coal is done to reduce the |
| A. | inherent impurities |
| B. | adhering impurities |
| C. | mineral matter |
| D. | both (b) and (c) |
| Answer» E. | |
| 896. |
'Fat' coal means a coal having |
| A. | low calorific value. |
| B. | high volatile matter, |
| C. | low ash content. |
| D. | non smoking tendency. |
| Answer» C. low ash content. | |
| 897. |
Anthracite can be used for |
| A. | recarbonising steel. |
| B. | making carbon electrodes; |
| 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). |
| Answer» E. | |
| 898. |
Blast furnace gas burns with a bluish flame, because of the presence of |
| A. | CO |
| B. | CH4 |
| C. | CO2 |
| D. | S |
| Answer» B. CH4 | |
| 899. |
In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less. |
| A. | difference in gross & net calorific value of the coke oven gas |
| B. | free carbon content in tar |
| C. | yield percentage of coke |
| D. | yield of ammonia present in coke oven gas |
| Answer» B. free carbon content in tar | |
| 900. |
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas. |
| A. | smoke |
| B. | temperature |
| C. | oxygen |
| D. | carbon monoxide |
| Answer» E. | |