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.
| 901. |
Gobar gas is produced by the __________ of cown dung. |
| A. | fermentation |
| B. | oxidation |
| C. | hydrogenation |
| D. | none of these |
| Answer» B. oxidation | |
| 902. |
With increase in the temperature of carbonisation of coal |
| A. | hydrogen content of coke oven gas increases due to cracking of hydrocarbons. |
| B. | methane content in the coke oven gas decreases and carbon monoxide content increases. |
| 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) |
| Answer» E. | |
| 903. |
'Fat coals' are those coals which have very high |
| A. | caking capacity. |
| B. | volatile matter content. |
| C. | fusion point of its ash. |
| D. | inherent moisture content. |
| Answer» B. volatile matter content. | |
| 904. |
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.$ |
| A. | 400-500 |
| B. | 900-1000 |
| C. | 1400-1500 |
| D. | 1700-1800 |
| Answer» C. 1400-1500 | |
| 905. |
Desirable "Micum Index" values of metal-lurical coke are |
| A. | M40 > 78% and M10 < 10%. |
| B. | M40 > 4% and M10 < 80%. |
| C. | M40 > 10% and M10 < 78%. |
| D. | M40 > 98% and M10 < 2%. |
| Answer» B. M40 > 4% and M10 < 80%. | |
| 906. |
__________ present in coal is not determined in its ultimate analysis. |
| A. | Fixed carbon |
| B. | Total carbon |
| C. | Hydrogen |
| D. | Nitrogen. |
| Answer» B. Total carbon | |
| 907. |
Increase in ash content of blast furnace coke |
| A. | reduces its consumption in the furnace. |
| B. | increases its consumption in the furnace. |
| C. | does not affect its consumption in the furnace. |
| D. | decreases its hardness and abrasion resistance. |
| Answer» C. does not affect its consumption in the furnace. | |
| 908. |
Tar is a better fuel than furnace oil, because of its |
| A. | higher calorific value. |
| B. | lower sulphur content. |
| C. | higher emissivity (0.8 - 0.9) resulting in higher radiation heat transfer rate. |
| D. | both (a) and (b). |
| Answer» E. | |
| 909. |
Narrow coke ovens as compared to wider coke ovens |
| A. | produce smaller coke. |
| B. | produce stronger coke. |
| C. | require less time of carbonisation. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 910. |
Efficient burning of anthracite coal requires |
| A. | low preheat of air. |
| B. | fine grinding. |
| C. | high excess air. |
| D. | all (a), (b) and (c). |
| Answer» C. high excess air. | |
| 911. |
The main function of primary air in pulverised coal fired burner is to |
| A. | burn CO to CO2. |
| B. | dry and transport the coal. |
| C. | have proper combustion by supplying it around the burner. |
| D. | preheat the tertiary air used for complete combustion of CO to CO2. |
| Answer» C. have proper combustion by supplying it around the burner. | |
| 912. |
Width of the coke oven towards coke side is slightly more than that on pusher side to |
| A. | facilitate easy discharging of coke as it swells during carbonisation. |
| B. | facilitate uniform heating of the oven. |
| C. | increase the output of the coke. |
| D. | none of these. |
| Answer» B. facilitate uniform heating of the oven. | |
| 913. |
Dry air requirement for burning 1 Nm3 of CO to CO2 may be around __________ Nm3. |
| A. | 2.4 |
| B. | 1.75 |
| C. | 0.87 |
| D. | 11.4 |
| Answer» B. 1.75 | |
| 914. |
A coal having higher volatile matter content, has lower |
| A. | smoking tendency on burning. |
| B. | coke oven gas yield on carbonisation. |
| C. | chance of catching fire during storage in open space. |
| D. | ignition temperature. |
| Answer» E. | |
| 915. |
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.$ |
| A. | 500 |
| B. | 750 |
| C. | 950 |
| D. | 1100 |
| Answer» C. 950 | |
| 916. |
A particular coal is said to be free burning when it |
| A. | burns completely. |
| B. | gives smokeless burning. |
| C. | shows little or no fusing action. |
| D. | none of these. |
| Answer» D. none of these. | |
| 917. |
Froth floatation is used for |
| A. | washing fine coal dust (< 0.5 mm size). |
| B. | washing lump coal (> 80 mm size). |
| C. | removing ash from the coal based on difference in specific gravity of coal and ash. |
| D. | all (a), (b)and(c). |
| Answer» B. washing lump coal (> 80 mm size). | |
| 918. |
Out of the following, which is the most important parameter for the blast furnace grade coke ? |
| A. | CSR & CRI |
| B. | Ash content |
| C. | Moisture content |
| D. | Volatile matter content |
| Answer» B. Ash content | |
| 919. |
The calorific value of producer gas is around __________ kcal/Nm3 |
| A. | 1300 |
| B. | 500 |
| C. | 4500 |
| D. | 9000 |
| Answer» B. 500 | |
| 920. |
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in |
| A. | shallow and small piles. |
| B. | fine sizes without the presence of any lump. |
| C. | closed space without any ventilation facility. |
| D. | large heaps with small surface to volume ratio. |
| Answer» B. fine sizes without the presence of any lump. | |
| 921. |
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the |
| A. | incomplete combustion. |
| B. | complete combustion. |
| C. | high oxygen in flue gas. |
| D. | none of these. |
| Answer» C. high oxygen in flue gas. | |
| 922. |
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm3. |
| A. | 4000 |
| B. | 2500 |
| C. | 6500 |
| D. | 10000 |
| Answer» D. 10000 | |
| 923. |
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent. |
| A. | 3 & 10 |
| B. | 10 & 3 |
| C. | 10 & 20 |
| D. | 15 & 8 |
| Answer» C. 10 & 20 | |
| 924. |
Fuel for a fast breeder nuclear reactor is |
| A. | plutonium |
| B. | uranium |
| C. | radium |
| D. | neptunium |
| Answer» B. uranium | |
| 925. |
As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air. |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | may increase or decrease depending on the type of fuel |
| Answer» C. remains same | |
| 926. |
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms. |
| A. | 1 to 2 |
| B. | 3 to 4 |
| C. | 5 to 15 |
| D. | 20 to 40 |
| Answer» D. 20 to 40 | |
| 927. |
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon |
| A. | is less liable to spontaneous combustion on storage. |
| B. | is more difficult to ignite and produces a shorter flame. |
| C. | requires smaller combustion space and less secondary air. |
| D. | none of these. |
| Answer» E. | |
| 928. |
Benzol is used |
| A. | as a motor fuel blend. |
| B. | for producing benzene, tolune & xylene by its distillation. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 929. |
Which of the following fuel gases has the highest calorific value ? |
| A. | Natural gas. |
| B. | Coal bed methane (CBM). |
| C. | Liquefied petroleum gas (LPG). |
| D. | Sewage gas. |
| Answer» D. Sewage gas. | |
| 930. |
Coke oven gas constitutes mainly of |
| A. | H2 & CO |
| B. | H2 & CH4 |
| C. | CH4 & CO |
| D. | H2 & CO2 |
| Answer» C. CH4 & CO | |
| 931. |
Natural draft created by the chimney depends upon |
| A. | temperature of the flue gas. |
| B. | its height. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 932. |
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the |
| A. | hot scarfing of steel slabs. |
| B. | mixing with blast furnace gas. |
| C. | coke oven battery heating. |
| D. | steel ladle drying. |
| Answer» D. steel ladle drying. | |
| 933. |
High excess air in combustion of fuels results in |
| A. | increased fuel consumption |
| B. | incomplete combustion |
| C. | smoky flame |
| D. | none of these |
| Answer» B. incomplete combustion | |
| 934. |
Which of the following petrographic constituents of coal is non-coking ? |
| A. | Vitrain |
| B. | Clarain |
| C. | Durain |
| D. | Fussain |
| Answer» E. | |
| 935. |
Which of the following is a single stage, fixed bed high pressure coal gasification process ? |
| A. | Winkler process |
| B. | Kopper-Totzek process |
| C. | Lurgi Process |
| D. | None of these |
| Answer» D. None of these | |
| 936. |
In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by |
| A. | potassium hydroxide. |
| B. | dilute potassium carbonate. |
| C. | cuporus chloride. |
| D. | alkaline pyragllol solution. |
| Answer» B. dilute potassium carbonate. | |
| 937. |
Flue gas from the heating chamber of byproduct coke ovens is removed by |
| A. | forced draft fan |
| B. | induced draft fan |
| C. | steam ejector |
| D. | natural draft |
| Answer» E. | |
| 938. |
Function of secondary air in pulverised coal firing is to |
| A. | transport the coal to the burner. |
| B. | dry the coal. |
| C. | ensure efficient burning of coal around the burner. |
| D. | reduce primary air requirement. |
| Answer» D. reduce primary air requirement. | |
| 939. |
Coking time in beehive coke oven is about |
| A. | 12 hours |
| B. | 2-3 days |
| C. | one week |
| D. | two weeks |
| Answer» C. one week | |
| 940. |
Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg. |
| A. | 1000 |
| B. | 4000 |
| C. | 8000 |
| D. | 15000 |
| Answer» D. 15000 | |
| 941. |
Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter. |
| A. | Junker's |
| B. | Bomb |
| C. | Boy's |
| D. | none of these |
| Answer» C. Boy's | |
| 942. |
The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be |
| A. | 27.6 |
| B. | 23 |
| C. | 47.3 |
| D. | 42.9 |
| Answer» C. 47.3 | |
| 943. |
With increase in C/H ratio of a fuel, the dew point of flue gases |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | may increase or decrease ; depends on the type of fuel |
| Answer» C. remains same | |
| 944. |
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 |
| B. | decrease |
| C. | increase or decrease depending on the fuel type |
| D. | not change |
| Answer» C. increase or decrease depending on the fuel type | |
| 945. |
Gobar gas constitutes mainly of |
| A. | CH4 & CO2 |
| B. | CO & CO2 |
| C. | CH4 & N2 |
| D. | CO & N2 |
| Answer» B. CO & CO2 | |
| 946. |
The pyragallol solution used in orsat apparatus can absorb |
| A. | only O2 |
| B. | both O2 and CO2 |
| C. | both O2 and CO |
| D. | all CO, CO2, and O2 |
| Answer» C. both O2 and CO | |
| 947. |
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is |
| A. | tar |
| B. | coke oven gas |
| C. | pitch |
| D. | pulverised coke |
| Answer» C. pitch | |
| 948. |
Which of the following is unsuitable fuel for producer gas manufacture ? |
| A. | Coke. |
| B. | Anthracite. |
| C. | Coal having low fusion point of its ash. |
| D. | Coal having high fusion point of its ash. |
| Answer» D. Coal having high fusion point of its ash. | |
| 949. |
High temperature carbonisation of coal produces |
| A. | inferior coke compared to low temperature carbonisation. |
| B. | less of gases compared to liquid products. |
| C. | large quantity of tar compared to low temperature carbonisation. |
| D. | none of these. |
| Answer» E. | |
| 950. |
Hard coke is manufactured from |
| A. | lignite |
| B. | bituminous coal |
| C. | semi-anthracite |
| D. | anthracite |
| Answer» C. semi-anthracite | |