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.
| 1001. |
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 reminder going to CO, the Orsat analysis in volume percent is |
| A. | CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60 |
| 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 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74 |
| Answer» C. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06 | |
| 1002. |
Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases. |
| A. | CO content |
| B. | dew point |
| C. | CO2 content |
| D. | O2 content |
| Answer» B. dew point | |
| 1003. |
Ignition temperature decreases progressively from anthracite to lignite, because |
| A. | volatile matter content increases. |
| B. | carbon content decreases. |
| C. | moisture content increases. |
| D. | ash content increases. |
| Answer» B. carbon content decreases. | |
| 1004. |
Which of the following is coking ? |
| A. | Vitrain |
| B. | Fussain |
| C. | both (a) & (b) |
| D. | Neither (a) nor (b) |
| Answer» B. Fussain | |
| 1005. |
High temperature in gasification of coal favours |
| A. | high production of CO2. |
| B. | low production of CO2. |
| C. | high production of CO. |
| D. | both (b) and (c). |
| Answer» E. | |
| 1006. |
The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm3. |
| A. | 5000 |
| B. | 25, 000 |
| C. | 10, 000 |
| D. | 15, 000 |
| Answer» C. 10, 000 | |
| 1007. |
Percentage of nitrogen in blast furnace gas may be around |
| A. | 5 |
| B. | 25 |
| C. | 55 |
| D. | 80 |
| Answer» D. 80 | |
| 1008. |
Which of the following can be made into briquettes without the use of a binder ? |
| A. | lignite |
| B. | Bituminous coal |
| C. | Anthracite coal |
| D. | None of these |
| Answer» B. Bituminous coal | |
| 1009. |
Calorific value of |
| A. | light paraffinic fuel oils is equal to that of equivalent olefins. |
| B. | n-paraffin is lower than that of iso-paraffins of the same compounds. |
| C. | light paraffinic fuel oils is higher than that of equivalent olefins. |
| D. | light paraffinic fuel oils is lower than that of equivalent olefins. |
| Answer» D. light paraffinic fuel oils is lower than that of equivalent olefins. | |
| 1010. |
Critical Air Blast (CAB) value of coke is a direct measure of its |
| A. | reactivity |
| B. | hardness |
| C. | strength |
| D. | none of these |
| Answer» B. hardness | |
| 1011. |
Which of the following has the highest calorific value ? |
| A. | Lignite |
| B. | Sub-bituminous coal |
| C. | Anthracite |
| D. | Peat |
| Answer» D. Peat | |
| 1012. |
Presence of free moisture in coal during its high temperature carbonisation |
| A. | reduces the coking time. |
| B. | protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls. |
| C. | increases the loss of fine coal dust from the ovens when charging. |
| D. | none of these. |
| Answer» C. increases the loss of fine coal dust from the ovens when charging. | |
| 1013. |
Removal of hydrogen from coke oven gas |
| A. | increases its calorific value. |
| B. | decreases its calorific value. |
| C. | does not alter its calorific value. |
| D. | is not possible on commerical scale. |
| Answer» B. decreases its calorific value. | |
| 1014. |
Most of the coking coals are |
| A. | anthracite |
| B. | bituminous |
| C. | lignite |
| D. | none of these |
| Answer» C. lignite | |
| 1015. |
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having |
| A. | higher methane content and thus higher calorific value. |
| B. | higher carbon monoxide content. |
| C. | lower carbon dioxide content. |
| D. | none of these. |
| Answer» B. higher carbon monoxide content. | |
| 1016. |
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of |
| A. | transportation of coal. |
| B. | drying of coal. |
| C. | combustion of coal by supplying it around the burner. |
| D. | preheating the primary air. |
| Answer» D. preheating the primary air. | |
| 1017. |
A coal having higher volatile matter content will necessarily have lower |
| A. | ash fusion temperature. |
| B. | calorific value. |
| C. | ignition temperature. |
| D. | caking index. |
| Answer» D. caking index. | |
| 1018. |
With increases in carbonisation temperature |
| A. | coke even gas yield increases. |
| B. | tar yield increases. |
| C. | hydrogen percentage in the coke oven gas decreases. |
| D. | methane percentage in the coke oven gas increases. |
| Answer» B. tar yield increases. | |
| 1019. |
Fusion point of coal ash increases with increase in its __________ content. |
| A. | iron sulphate |
| B. | iron silicate |
| C. | lime and magnesia |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1020. |
Which of the following is used for making the explosive 'TNT' ? |
| A. | Benzol |
| B. | Toluene |
| C. | Pyridine |
| D. | Cerosote |
| Answer» C. Pyridine | |
| 1021. |
The maximum adiabatic flame temperature is attained, when the fuel is burnt with |
| A. | theoretically required amount of air. |
| B. | more than theoretically required amount of air. |
| C. | less than theoretically required amount of air. |
| D. | theoretically required amount of oxygen. |
| Answer» E. | |
| 1022. |
High ash coals |
| A. | are soft & friable (poor strength and size stability). |
| B. | require longer time of carbonisation as ash offers resistance to heat transfer. |
| C. | produce larger quantity of coke oven gas. |
| D. | none of these. |
| Answer» C. produce larger quantity of coke oven gas. | |
| 1023. |
Washing of coal |
| A. | reduces its ash & sulphur content. |
| B. | improves its coking properties. |
| C. | increase the fusion point of its ash by removing chlorine compounds. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1024. |
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent. |
| A. | 5 |
| B. | 25 |
| C. | 55 |
| D. | 75 |
| Answer» C. 55 | |
| 1025. |
The difference between total carbon and fixed carbon of coal will be minimum in case of |
| A. | lignite |
| B. | bituminous coal |
| C. | anthracite |
| D. | high temperature coke (V.M < 0.5%) |
| Answer» E. | |
| 1026. |
Fischer-Tropsch method aims at the |
| A. | gasification of coal. |
| B. | synthesis of gasoline (from water gas). |
| C. | hydrogenation of coal to produce gasoline. |
| D. | none of these. |
| Answer» C. hydrogenation of coal to produce gasoline. | |
| 1027. |
Bunsen burner is an example of a/an __________ burner. |
| A. | inside mixing/premix type |
| B. | outside mixing/diffusion flame/nozzle mix type. |
| C. | rotary cup. |
| D. | submerged combustion. |
| Answer» B. outside mixing/diffusion flame/nozzle mix type. | |
| 1028. |
Which will have the least volatile matter and hence will be the most difficult to ignite? |
| A. | Bituminous coal |
| B. | Coke |
| C. | Semi-bituminous coal |
| D. | Aanthracite |
| Answer» C. Semi-bituminous coal | |
| 1029. |
The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be |
| A. | 21 |
| B. | 77 |
| C. | 79 |
| D. | 29 |
| Answer» B. 77 | |
| 1030. |
Preheating of __________ the flame temperature. |
| A. | the gaseous fuel before combustion decreases |
| B. | combustion air decreases |
| C. | either the fuel or the air or both, increases |
| D. | either the fuel or the air does not affect. |
| Answer» D. either the fuel or the air does not affect. | |
| 1031. |
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ? |
| A. | Ammonium sulphate |
| B. | Ammonium nitrate |
| C. | Ammonium phosphate |
| D. | None of these |
| Answer» B. Ammonium nitrate | |
| 1032. |
In Lurgi coal gasifier, |
| A. | coking coals cannot be used. |
| B. | low carbon conversion efficiency is achieved. |
| C. | entrainment of solids is higher. |
| D. | larger quantity of coal can be processed. |
| Answer» E. | |
| 1033. |
Which of the following is not applicable to fluidised bed combustion of coal ? |
| A. | It can not burn low grade coal. |
| B. | It achieves higher fuel combustion efficiency. |
| C. | Less heat transfer surface area is required in boilers. |
| D. | None of these. |
| Answer» B. It achieves higher fuel combustion efficiency. | |
| 1034. |
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ? |
| A. | Benzol |
| B. | Pitch-cresosote mixture (PCM) |
| C. | Napthalene |
| D. | Ethylene |
| Answer» E. | |
| 1035. |
Carbon Content by weight in air dried wood may be about __________ percent. |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 80 |
| Answer» D. 80 | |
| 1036. |
Presence of force moisture in coal is most disadvantageous during its |
| A. | transportation and handling |
| B. | washing |
| C. | pulverisation |
| D. | storage |
| Answer» D. storage | |
| 1037. |
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3)? |
| A. | Producer gas |
| B. | Carburetted water gas |
| C. | Natural gas |
| D. | Liquified petroleum gas |
| Answer» E. | |
| 1038. |
Producer gas containing least amount of tar is produced by the |
| A. | partial combustion of coal. |
| B. | partial combustion of large size (< 50 mm) coke. |
| C. | high pressure gasification of coal (e.g. in Lurgi gasifier). |
| D. | atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier). |
| Answer» C. high pressure gasification of coal (e.g. in Lurgi gasifier). | |
| 1039. |
"Overfire burning" in a furnace is a phenomenon characterised by the |
| A. | supply of excess fuel. |
| B. | supply of excess air. |
| C. | burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1040. |
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm3 gas ? |
| A. | Blast furnace gas |
| B. | Natural gas |
| C. | Producer gas |
| D. | Water gas |
| Answer» C. Producer gas | |
| 1041. |
The internal energy of the combustion products is __________ compared to that of reactants. |
| A. | more |
| B. | less |
| C. | equal |
| D. | more or less ; (depends on the state of fuel.) |
| Answer» C. equal | |
| 1042. |
Pulverised coal used in boiler firing need not have |
| A. | less moisture content |
| B. | high fusion point of its ash |
| C. | high bulk density |
| D. | lower ash content |
| Answer» C. high bulk density | |
| 1043. |
Low temperature carbonisation of coal takes place at __________ °C.$ |
| A. | 300 |
| B. | 1100 |
| C. | 700 |
| D. | 150 |
| Answer» D. 150 | |
| 1044. |
Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3. |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 1 |
| Answer» B. 4 | |
| 1045. |
'Wobbe index' is a characteristic of |
| A. | solid fuels |
| B. | gaseous fuels |
| C. | liquid fuels |
| D. | fat coals |
| Answer» C. liquid fuels | |
| 1046. |
Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O) ? |
| A. | Blast furnace coke |
| B. | Low temperature coke |
| C. | Anthracite coal |
| D. | Sub-bituminous coal |
| Answer» C. Anthracite coal | |
| 1047. |
In high temperature carbonisation (as compared to low temperature carbonisation) of coal |
| A. | coke oven gas yield is more. |
| B. | tar yield is less but free carbon in tar is more. |
| C. | calorific value of coke oven gas is less. |
| D. | all (a), (b), and (c). |
| Answer» E. | |
| 1048. |
Cannel coal and boghead coal are the examples of |
| A. | humic coals |
| B. | liptobiolites |
| C. | sapropelic coals |
| D. | none of these |
| Answer» D. none of these | |
| 1049. |
Highly caking coals |
| A. | produce weak coke. |
| B. | produce strong coke. |
| C. | may damage the coke oven walls during carbonisation. |
| D. | both (b) and (c). |
| Answer» E. | |
| 1050. |
Which of the following is not a manufactured fuel ? |
| A. | Furnace oil |
| B. | Bagasse |
| C. | Semi-coke |
| D. | Kerosene |
| Answer» C. Semi-coke | |