MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
_Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.$? |
| A. | 80 and 97 |
| B. | 95 and 100 |
| C. | 40 and 70 |
| D. | 25 and 97 |
| Answer» B. 95 and 100 | |
| 2. |
_Compound coke ovens are those which can be heated by$? |
| A. | Both steam and electrical power |
| B. | Lean gas (e.g., B.F. gas) |
| C. | Rich gas (e.g., coke oven gas) |
| D. | Both B and C |
| Answer» E. | |
| 3. |
_Natural draft created by the chimney depends upon$? |
| A. | Temperature of the flue gas |
| B. | Its height |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 4. |
_In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by$? |
| A. | Cuprous chloride |
| B. | Potassium hydroxide |
| C. | Alkaline pyrogallol solution |
| D. | None of these |
| Answer» B. Potassium hydroxide | |
| 5. |
_Caking coal is desirable for$? |
| A. | Burning on travelling grate |
| B. | Coke making |
| C. | Burning on firebars |
| D. | All of the above |
| Answer» C. Burning on firebars | |
| 6. |
_High excess air in combustion of fuels results in$? |
| A. | Increased fuel consumption |
| B. | Incomplete combustion |
| C. | Smoky flame |
| D. | None of these |
| Answer» B. Incomplete combustion | |
| 7. |
_Spontaneous combustion of coal on storage results due to$? |
| A. | Inadequate ventilation |
| B. | Low temperature oxidation |
| C. | Storage in large heaps with small surface to volume ratio |
| D. | All of the above |
| Answer» E. | |
| 8. |
_C/H ratio is the maximum in case of$? |
| A. | Coal |
| B. | Furnace oil |
| C. | Natural gas |
| D. | Naphtha |
| Answer» B. Furnace oil | |
| 9. |
_Fusion point of coal ash increases with increase in its __________ content.$? |
| A. | Iron sulphate |
| B. | Iron silicate |
| C. | Lime and magnesia |
| D. | All of the above |
| Answer» E. | |
| 10. |
_With increase in the temperature of carbonisation of coal$? |
| 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 & H? content |
| D. | All of the above |
| Answer» E. | |
| 11. |
_Preheating of coal charge for the coke ovens reduces the$? |
| A. | Time of carbonisation |
| B. | Yield of gas and tar |
| C. | Fuel consumption in coking |
| D. | All of the above |
| Answer» E. | |
| 12. |
_Shatter index of the coke is a measure of its$? |
| A. | Strength |
| B. | Bulk density |
| C. | Reactivity |
| D. | None of these |
| Answer» B. Bulk density | |
| 13. |
_Turndown ratio of a gas burner is equal to the$? |
| A. | Maximum to minimum heat input ratio |
| B. | Maximum to minimum permissible gas flow rate |
| C. | Both A & B |
| D. | Minimum to maximum heat input ratio |
| Answer» D. Minimum to maximum heat input ratio | |
| 14. |
_Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?$? |
| A. | Ash disposal problem |
| B. | Excessive fly-ash discharge from the stack |
| C. | High power consumption in its transportation |
| D. | Erosion of induced draft fan blades |
| Answer» B. Excessive fly-ash discharge from the stack | |
| 15. |
_Which of the following has the highest heat of combustion?$? |
| A. | H‚ÇÇ |
| B. | CO |
| C. | CH‚ÇÑ |
| D. | C‚ÇÇH‚ÇÜ |
| Answer» E. | |
| 16. |
_Safe condition for storage of high V.M. bituminous coal is that$? |
| 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 | |
| 17. |
_Assam coals suffers mainly from the disadvantage of high __________ content.$? |
| A. | Ash |
| B. | Volatile matter |
| C. | Sulphur (4-6%) |
| D. | Moisture |
| Answer» D. Moisture | |
| 18. |
_Deficiency of combustion air during combustion of a gaseous fuel$? |
| A. | Lengthens the flame |
| B. | Causes heat loss of fuel by its partial combustion |
| C. | Both A & B |
| D. | Shortens the flame |
| Answer» D. Shortens the flame | |
| 19. |
_Use of pulverised coal in boiler furnace provides$? |
| A. | High calorific value |
| B. | Better combustion |
| C. | Smokeless burning |
| D. | Less erosion on furnace walls |
| Answer» C. Smokeless burning | |
| 20. |
_Gobar gas constitutes mainly of$? |
| A. | CH‚ÇÑ & CO‚ÇÇ |
| B. | CO & CO‚ÇÇ |
| C. | CH‚ÇÑ & N‚ÇÇ |
| D. | CO & N‚ÇÇ |
| Answer» B. CO & CO‚Äö√á√á | |
| 21. |
_Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.$? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 1 |
| Answer» B. 4 | |
| 22. |
_The gasification reaction represented by, C + H‚ÇÇO = CO + H‚ÇÇ, is$? |
| A. | Exothermic |
| B. | Endothermic |
| C. | Catalytic |
| D. | Autocatalytic |
| Answer» C. Catalytic | |
| 23. |
_Orsat apparatus$? |
| A. | Gives flue gas analysis on dry basis |
| B. | Determines N‚ÇÇ in flue gas indirectly |
| C. | Can |
| D. | All of the above |
| Answer» E. | |
| 24. |
_Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.$? |
| A. | Hydrogenation |
| B. | Gasification |
| C. | Carbonisation |
| D. | None of these |
| Answer» B. Gasification | |
| 25. |
_A coal that softens and fuses on heating is$? |
| A. | Classified |
| B. | Carbonised |
| C. | Caking |
| D. | Non-caking |
| Answer» D. Non-caking | |
| 26. |
_Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher$? |
| A. | Calorific value |
| B. | Higher C/H ratio |
| C. | Sulphur content |
| D. | Difference in gross & net calorific value |
| Answer» C. Sulphur content | |
| 27. |
_Lurgi coal gasifier is a pressurised __________ bed reactor.$? |
| A. | Moving |
| B. | Fixed |
| C. | Fluidised |
| D. | Entrained |
| Answer» B. Fixed | |
| 28. |
_Air/gas ratio for complete combustion will be the highest for$? |
| A. | LPG |
| B. | Gobar gas |
| C. | Coke oven gas |
| D. | Carburetted water gas |
| Answer» B. Gobar gas | |
| 29. |
_Washing of coal$? |
| A. | Reduces its ash & sulphur content |
| B. | Improves its coking properties |
| C. | Increase the fusion point of its ash by removing chlorine compounds |
| D. | All of the above |
| Answer» E. | |
| 30. |
_Power alcohol as compared to straight run gasoline has lower$? |
| A. | Calorific value |
| B. | Octane number |
| C. | Specific gravity |
| D. | Viscosity |
| Answer» B. Octane number | |
| 31. |
_Out of the following fuels, the difference between the net and gross calorific value is maximum in case of$? |
| A. | Pitch |
| B. | Fuel oil |
| C. | Blast furnace gas |
| D. | Bituminous coal |
| Answer» C. Blast furnace gas | |
| 32. |
_Which of the following gaseous fuels is likely to have the highest gross calorific value?$? |
| A. | Sewage gas |
| B. | LPG |
| C. | Producer gas |
| D. | Natural gas |
| Answer» C. Producer gas | |
| 33. |
_The liquid used for the washing of coal in an industrial coal washery is a mixture of water and$? |
| A. | Carbon tetrachloride |
| B. | Sand (40%) |
| C. | Mineral oil of high viscosity & specific gravity (1.6) |
| D. | None of these |
| Answer» C. Mineral oil of high viscosity & specific gravity (1.6) | |
| 34. |
_Which of the following accounts for maximum energy loss in a boiler?$? |
| A. | Flue gases |
| B. | Ash content in the fuel |
| C. | Incomplete combustion |
| D. | Unburnt carbon in flue gases |
| Answer» B. Ash content in the fuel | |
| 35. |
Coal tar (produced by high temperature carbonisation) is the main source of$? |
| A. | Aromatic compounds |
| B. | Alphatic compounds |
| C. | Paraffins |
| D. | Olefins |
| Answer» B. Alphatic compounds | |
| 36. |
Calorific value of coke oven gas is around __________ Kcal/Nm³.$? |
| A. | 900 |
| B. | 4200 |
| C. | 7500 |
| D. | 2000 |
| Answer» C. 7500 | |
| 37. |
Which of the following is the most reactive (as regards the formation of CO + H‚ÇÇ from C + H‚ÇÇO) ?$? |
| A. | Blast furnace coke |
| B. | Low temperature coke |
| C. | Anthracite coal |
| D. | Sub-bituminous coal |
| Answer» C. Anthracite coal | |
| 38. |
Which of the following fuels is generally not used in thermal power plant boiler firing?$? |
| 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 | |
| 39. |
Gross and net calorific value of a fuel will be the same$? |
| A. | If its ash content is zero |
| B. | Ifits carbon content is very low |
| C. | If its hydrogen/hydrogen compound content is zero |
| D. | Under no circumstances |
| Answer» D. Under no circumstances | |
| 40. |
Lignite is$? |
| 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 | |
| 41. |
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?$? |
| A. | Vitrain |
| B. | Clarain |
| C. | Durain |
| D. | Fussain |
| Answer» B. Clarain | |
| 42. |
(64-132) rank coal (ASTM) means a coal with 64%$? |
| A. | Fixed carbon and having a heat value of 13, 200 BTU/1b |
| B. | Ash and a heating value of 13, 200 BTU/1b |
| C. | Fixed carbon and a heating value of 132 BTU/1b |
| D. | None of these |
| Answer» B. Ash and a heating value of 13, 200 BTU/1b | |
| 43. |
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.$? |
| A. | 1100 |
| B. | 1250 |
| C. | 1350 |
| D. | 1400 |
| Answer» B. 1250 | |
| 44. |
High sulphur (4-6%) coal in India are found in$? |
| A. | Assam |
| B. | Andhra Pradesh |
| C. | Bengal |
| D. | Madhya Pradesh |
| Answer» B. Andhra Pradesh | |
| 45. |
Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.$? |
| A. | 300 |
| B. | 2000 |
| C. | 5000 |
| D. | 10000 |
| Answer» C. 5000 | |
| 46. |
Coal containing large quantity of __________ are difficult to wash.$? |
| A. | Ash |
| B. | Inherent mineral matter |
| C. | Free impurities |
| D. | Volatile matter |
| Answer» C. Free impurities | |
| 47. |
During coking of coal, the ash content (percentage)$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of these |
| Answer» B. Decreases | |
| 48. |
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is$? |
| A. | Tar |
| B. | Coke oven gas |
| C. | Pitch |
| D. | Pulverised coke |
| Answer» C. Pitch | |
| 49. |
Which of the following fuel gases has the highest calorific value ?$? |
| A. | Natural gas |
| B. | Coal bed methane (CBM) |
| C. | Liquefied petroleum gas (LPG) |
| D. | Sewage gas |
| Answer» D. Sewage gas | |
| 50. |
High temperature carbonisation of coal takes place at __________ °C.$? |
| A. | 2000 |
| B. | 600 |
| C. | 1100 |
| D. | 1600 |
| Answer» D. 1600 | |