MCQOPTIONS
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MCQOPTIONS
This section includes 408 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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. | Anthracite |
| Answer» C. Semi-bituminous coal | |
| 2. |
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 | |
| 3. |
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 | |
| 4. |
‘Wind loss’ resulting from unscientific storage of coal may be the order of about _____________ percent? |
| A. | 2.5 |
| B. | 7.5 |
| C. | 10.5 |
| D. | 14.5 |
| Answer» B. 7.5 | |
| 5. |
With increase in calorific value of fuels, their adiabatic flame temperatures__________________? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | May increase or decrease; depends on the quantity of products of combustion |
| Answer» E. | |
| 6. |
With increase in C/H ratio of a fuel, the amount of CO2 formed on its complete combustion____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | Either A. or B., depends on other factors |
| Answer» B. Decreases | |
| 7. |
With increase in C/H ratio of a fuel, the dew point of flue gases______________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | May increase or decrease; depends on the type of fuel |
| Answer» C. Remain same | |
| 8. |
With increase in moisture content of coal, its___________________? |
| A. | Calorific value increases |
| B. | Caking properties diminish |
| C. | Swelling during carbonisation becomes excessive |
| D. | None of these |
| Answer» C. Swelling during carbonisation becomes excessive | |
| 9. |
With increase in moisture content of coal, its_____________________? |
| A. | Calorific value increases sometimes |
| B. | Bulk density always decreases |
| C. | Clinkering tendency during combustion increases |
| D. | None of these |
| Answer» E. | |
| 10. |
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. | |
| 11. |
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. | |
| 12. |
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 | |
| 13. |
With increase in the time of carbonisation at a particular temperature (say 1000°C), the ______________ percentage in coke oven gas increases? |
| A. | Hydrogen |
| B. | Methane |
| C. | Unsaturated hydrocarbons |
| D. | All A., B. and C. |
| Answer» B. Methane | |
| 14. |
‘Wobbe index’ is a characteristic of__________________? |
| A. | Solid fuels |
| B. | Gaseous fuels |
| C. | Liquid fuels |
| D. | Fat coals |
| Answer» C. Liquid fuels | |
| 15. |
Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the____________________? |
| A. | Decolourisation of sugar |
| B. | Solvent recovery from air and gases |
| C. | Absorption of gases and vapor |
| D. | Electrode manufacture |
| Answer» E. | |
| 16. |
Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron? |
| A. | 300 |
| B. | 2000 |
| C. | 5000 |
| D. | 10000 |
| Answer» C. 5000 | |
| 17. |
Yield of charcoal in high temperature carbonisation of wood is about _____________ percent? |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 75 |
| Answer» C. 50 | |
| 18. |
Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal? |
| A. | 60 |
| B. | 160 |
| C. | 500 |
| D. | 750 |
| Answer» C. 500 | |
| 19. |
Yield of pitch from distillation of high temperature tar is around _____________ percent? |
| A. | 10 |
| B. | 25 |
| C. | 65 |
| D. | 90 |
| Answer» D. 90 | |
| 20. |
Which of the following is used for making the explosive „TNT‟ ? |
| A. | Benzol |
| B. | Toluene |
| C. | Pyridine |
| D. | Cerosote |
| Answer» C. Pyridine | |
| 21. |
Which of the following is not endothermic ? |
| A. | Cracking |
| B. | Reforming |
| C. | Gasification |
| D. | Partial oxidation |
| Answer» E. | |
| 22. |
Which of the following is not a ‘manufactured’ fuel ? |
| A. | LPG |
| B. | Coal briquettes |
| C. | Tar |
| D. | Colloidal fuels |
| Answer» D. Colloidal fuels | |
| 23. |
Which of the following is called “blue gas”? |
| A. | Coke oven gas |
| B. | Water gas |
| C. | Natural gas |
| D. | Producer gas |
| Answer» C. Natural gas | |
| 24. |
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 | |
| 25. |
Which of the following is a measure of the agglutinating (i.e., binding) property of coal ? |
| A. | Thickness of plastic layer |
| B. | Caking index |
| C. | Swelling index |
| D. | Gray-king index |
| Answer» C. Swelling index | |
| 26. |
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 | |
| 27. |
Which of the following has the highest heat of combustion ? |
| A. | H2 |
| B. | CO |
| C. | CH4 |
| D. | C2H6 |
| Answer» E. | |
| 28. |
Which of the following has the highest calorific value (kcal/Nm3) ? |
| A. | Carburetted water gas |
| B. | Gobar gas |
| C. | Natural gas |
| D. | LPG |
| Answer» E. | |
| 29. |
Which of the following gaseous fuels is likely to have the highest gross calorific value ? |
| A. | Sewage gas |
| B. | LPG |
| C. | Producer gas |
| D. | Natural gas |
| Answer» C. Producer gas | |
| 30. |
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. | Liquefied petroleum gas |
| Answer» E. | |
| 31. |
Which of the following fuels is generally not used in thermal power plant boiler firing ? |
| A. | Furnace oil, light diesel oil and tar/PCM |
| B. | Pulverised coking coal |
| C. | Coal middling from washeries |
| D. | B.F. gas, coke oven gas and L.D. converter gas |
| Answer» C. Coal middling from washeries | |
| 32. |
Which of the following constituents of coal is the most important in the production of coke ? |
| A. | Moisture |
| B. | Ash |
| C. | Volatiles |
| D. | Carbon |
| Answer» E. | |
| 33. |
Which of the following accentuates clinkering 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. | |
| 34. |
Which adsorbent is used for removing sulphur compounds (S Q, H2S, RSH etc.) removal from coke oven gas in by-products recovery plant ? |
| A. | Silica gel |
| B. | Diatomaceous earth |
| C. | Basalt |
| D. | Bog iron (i.e., moist ferric hydroxide) |
| Answer» E. | |
| 35. |
When the coal is heated in absence of air, it is called its ________________? |
| A. | Deoxidation |
| B. | Gasification |
| C. | Coalification |
| D. | Carbonisation |
| Answer» E. | |
| 36. |
When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal? |
| A. | Carbonisation |
| B. | Oxidation |
| C. | Coalification |
| D. | Gasification |
| Answer» E. | |
| 37. |
When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________? |
| A. | CO2 |
| B. | CO |
| C. | O2 |
| D. | C |
| Answer» C. O2 | |
| 38. |
Weathering of coal during storage causes_______________? |
| A. | Reduction in coal size |
| B. | Increase in its friability |
| C. | Decrease in its caking capacity |
| D. | All A., B. and C. |
| Answer» E. | |
| 39. |
Water gas constitutes mainly of __________________? |
| A. | CO & H2 |
| B. | CO & N2 |
| C. | CO2 & H2 |
| D. | CH4 & H2 |
| Answer» B. CO & N2 | |
| 40. |
Washing of coal________________? |
| A. | Reduces its sulphur and ash content |
| B. | Controls its ash fusibility and increases its calorific value |
| C. | Improves its coking properties |
| D. | All A., B. and C. |
| Answer» E. | |
| 41. |
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. | |
| 42. |
Washing of coal is done to reduce the_________________? |
| A. | Inherent impurities |
| B. | Adhering impurities |
| C. | Mineral matter |
| D. | Both B. and C. |
| Answer» E. | |
| 43. |
Washing of coal decreases its_________________? |
| A. | Caking index |
| B. | Mineral matter content |
| C. | Ash content |
| D. | Both B. and C. |
| Answer» C. Ash content | |
| 44. |
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. | |
| 45. |
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 | |
| 46. |
Volatile matter content in coking coal may be about _____________ percent? |
| A. | 1 |
| B. | 7 |
| C. | 22 |
| D. | 46 |
| Answer» D. 46 | |
| 47. |
Volatile matter content of metallurgical coke may be around ______________ percent? |
| A. | 1-2 |
| B. | 10-15 |
| C. | 22-26 |
| D. | 30-33 |
| Answer» B. 10-15 | |
| 48. |
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 | |
| 49. |
Use of preheated air for combustion of fuel in the furnace, increases the___________________? |
| A. | Scale losses of the furnace stock |
| B. | Calorific value of the fuel |
| C. | Flame temperature |
| D. | None of these |
| Answer» D. None of these | |
| 50. |
Use of pulverised coal in boiler furnace provides___________________? |
| A. | High calorific value |
| B. | Better combustion |
| C. | Smokeless burning |
| D. | Less erosion on furnace walls |
| Answer» C. Smokeless burning | |