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.
| 451. |
_ Gobar gas is produced by the __________ of 'gobar' (cow dung).$? |
| A. | Hydrolysis |
| B. | Fermentation |
| C. | Oxidation |
| D. | Dehydration |
| Answer» C. Oxidation | |
| 452. |
_ Abel apparatus is used for those oils, whose flash points are___°F.$? |
| A. | <120 |
| B. | >120 |
| C. | >280 |
| D. | 300-600 |
| Answer» B. >120 | |
| 453. |
_ Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.$? |
| A. | Junker's |
| B. | Bomb |
| C. | Boy's |
| D. | None of these |
| Answer» C. Boy's | |
| 454. |
_ Which of the following has the highest calorific value?$? |
| A. | Lignite |
| B. | Sub-bituminous coal |
| C. | Anthracite |
| D. | Peat |
| Answer» D. Peat | |
| 455. |
_ Actual flame temperature is always lower than the adiabatic flame temperature, because there is$? |
| A. | No possibility of obtaining complete combustion at high temperature |
| B. | Always loss of heat from the flame |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 456. |
_ __________ of the coal is the basis for Seylor's coal classification.$? |
| A. | Proximate analysis |
| B. | Ultimate analysis |
| C. | Caking index |
| D. | Calorific value |
| Answer» C. Caking index | |
| 457. |
_ Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.$? |
| A. | 6 |
| B. | 18 |
| C. | 28 |
| D. | 36 |
| Answer» C. 28 | |
| 458. |
_ Tar is a better fuel than furnace oil, because of its$? |
| 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 & B |
| Answer» E. | |
| 459. |
_ Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.$? |
| A. | 2.5 |
| B. | 0.5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 0.5 | |
| 460. |
_ A particular coal is said to be free burning when it$? |
| A. | Burns completely |
| B. | Gives smokeless burning |
| C. | Shows little or no fusing action |
| D. | None of these |
| Answer» D. None of these | |
| 461. |
_ Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.$? |
| A. | 6 |
| B. | 12 |
| C. | 18 |
| D. | 24 |
| Answer» E. | |
| 462. |
_ Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.$? |
| A. | 1800 |
| B. | 3200 |
| C. | 5400 |
| D. | 10200 |
| Answer» D. 10200 | |
| 463. |
_ Blast furnace gas compared to coke oven gas has$? |
| A. | Lower ignition temperature |
| B. | Narrower limit of inflammability |
| C. | Higher calorific value |
| D. | Lower theoretical flame temperature |
| Answer» E. | |
| 464. |
__Which of the following is not a binder for coal briquetting?__ |
| A. | Coal tar |
| B. | Bitumen |
| C. | Molasses |
| D. | None of these |
| Answer» E. | |
| 465. |
__Which of the following is not endothermic?__ |
| A. | Cracking |
| B. | Reforming |
| C. | Gasification |
| D. | Partial oxidation |
| Answer» E. | |
| 466. |
__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 | |
| 467. |
__Catalyst used in Fischer-Tropsch process is__ |
| A. | Nickel |
| B. | Zinc oxide |
| C. | Alumina |
| D. | Thorium oxide |
| Answer» B. Zinc oxide | |
| 468. |
__Which of the following has the highest flame speed?__ |
| A. | CO |
| B. | H‚ÇÇ |
| C. | CH‚ÇÑ |
| D. | C‚ÇÇH‚ÇÜ |
| Answer» C. CH‚Äö√á√ë | |
| 469. |
__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. | |
| 470. |
__In high temperature carbonisation of coal compared to low temperature carbonisation__ |
| A. | Yield of ammonia is less |
| B. | Aromatic content of tar is low |
| C. | H‚ÇÇ content in the coke oven gas is more |
| D. | Calorific value of the coke oven gas is lower |
| Answer» D. Calorific value of the coke oven gas is lower | |
| 471. |
__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 | |
| 472. |
__C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.__ |
| A. | Decreases |
| B. | Increases |
| C. | Remains constant |
| D. | May increase or decrease, depends on combustibles |
| Answer» E. | |
| 473. |
__Low temperature oxidation of coal is accelerated by the__ |
| A. | Storage in large heaps |
| B. | Storage in compressed piles |
| C. | Absence of porous or friable particles |
| D. | All of the above |
| Answer» B. Storage in compressed piles | |
| 474. |
__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 | |
| 475. |
_Coke oven gas burns with an yellowish flame, because of the presence of$? |
| A. | CO‚ÇÇ |
| B. | CH‚ÇÑ |
| C. | H‚ÇÇ |
| D. | NH‚ÇÉ |
| Answer» C. H‚Äö√á√á | |
| 476. |
_Coke oven gas compared to blast furnace gas is$? |
| A. | More explosive and inflammable |
| B. | Less poisonous |
| C. | Lighter |
| D. | All of the above |
| Answer» E. | |
| 477. |
_Which of the following accentuates clinker-ing trouble on furnace grate burning coal?$? |
| 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 of the above |
| Answer» E. | |
| 478. |
_The calorific value of a gas of composition CO‚ÇÇ = 20%, H‚ÇÇ = 50%, CH‚ÇÑ = 30%, is y. If the composition of gas is changed to H‚ÇÇ = 50%, CH‚ÇÑ = 30%, CO‚ÇÇ = 10%, N‚ÇÇ = 10%, then the calorifice value will be$? |
| A. | Y |
| B. | 0.95 y |
| C. | 1.05 y |
| D. | 1.8 y |
| Answer» B. 0.95 y | |
| 479. |
_Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?$? |
| A. | Calorific value of the fuel |
| B. | Flame temperature achieved |
| C. | Speed of combustion of fuel |
| D. | Heat transfer rate to the stock in the furnace |
| Answer» B. Flame temperature achieved | |
| 480. |
_Which of the following is a single stage, fixed bed high pressure coal gasification process?$? |
| A. | Winkler process |
| B. | Kopper-Totzek process |
| C. | Lurgi Process |
| D. | None of these |
| Answer» D. None of these | |
| 481. |
_Which of the following is used for making the explosive 'TNT'?$? |
| A. | Benzol |
| B. | Toluene |
| C. | Pyridine |
| D. | Cerosote |
| Answer» C. Pyridine | |
| 482. |
_Producer gas containing least amount of tar is produced by the$? |
| A. | Partial combustion of coal |
| B. | Partial combustion of large size (< 50 mm) coke |
| C. | High pressure gasification of coal (e.g. in Lurgi gasifier) |
| D. | Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier) |
| Answer» C. High pressure gasification of coal (e.g. in Lurgi gasifier) | |
| 483. |
_Undercharging of coal in the by-product coke ovens results in$? |
| A. | Decrease in the c.v. of coke oven gas |
| B. | Increase in its throughput |
| C. | Increase in the c.v. of coke oven gas |
| D. | No change in the c.v. of coke oven gas |
| Answer» B. Increase in its throughput | |
| 484. |
_Pick out the wrong statement.:$? |
| A. | Carburetted water gas is also called blue gas |
| B. | Coals are divided in four species according to their carbon content in Seylor's classification |
| C. | Carbonisation time in a by-product coke oven is about 16 hours |
| D. | Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons |
| Answer» B. Coals are divided in four species according to their carbon content in Seylor's classification | |
| 485. |
_Carbon Content by weight in air dried wood may be about __________ percent.$? |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 80 |
| Answer» D. 80 | |
| 486. |
_Ignition temperature decreases progressively from anthracite to lignite, because$? |
| A. | Volatile matter content increases |
| B. | Carbon content decreases |
| C. | Moisture content increases |
| D. | Ash content increases |
| Answer» B. Carbon content decreases | |
| 487. |
_Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO‚ÇÇ, 20%CO and 10%O‚ÇÇ. The percent excess oxygen used is$? |
| A. | 20 |
| B. | 12.5 |
| C. | 0 |
| D. | 10 |
| Answer» D. 10 | |
| 488. |
_In Lurgi coal gasifier,$? |
| A. | Coking coals cannot be used |
| B. | Low carbon conversion efficiency is achieved |
| C. | Entrainment of solids is higher |
| D. | Larger quantity of coal can be processed |
| Answer» E. | |
| 489. |
_Preheating of a gaseous fuel results in increased$? |
| A. | Flame length |
| B. | Flame temperature |
| C. | Quantity of flue gas |
| D. | Ignition temperature |
| Answer» C. Quantity of flue gas | |
| 490. |
_Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is$? |
| A. | H‚ÇÇ |
| B. | CH‚ÇÑ |
| C. | CO‚ÇÇ |
| D. | N‚ÇÇ |
| Answer» C. CO‚Äö√á√á | |
| 491. |
_Calorific value as determined by bomb calorimeter is the$? |
| A. | Higher calorific value at constant volume |
| B. | Gross calorific value at constant pressure |
| C. | Lower calorific value at constant pressure |
| D. | Net calorific value at constant volume |
| Answer» B. Gross calorific value at constant pressure | |
| 492. |
_If CO‚ÇÇ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as$? |
| A. | O‚ÇÇ |
| B. | CO |
| C. | N‚ÇÇ |
| D. | SO‚ÇÇ |
| Answer» E. | |
| 493. |
_Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the$? |
| A. | Requirement of large volume combustion chamber |
| B. | Risk of explosion |
| C. | Chances of clinker formation |
| D. | Incomplete combustion of coal |
| Answer» C. Chances of clinker formation | |
| 494. |
_Out of the following, which is the most important parameter for the blast furnace grade coke?$? |
| A. | CSR & CRI |
| B. | Ash content |
| C. | Moisture content |
| D. | Volatile matter content |
| Answer» B. Ash content | |
| 495. |
_Ionisation potential applied across the electrodes of electrostatic tar precipitator is around$? |
| A. | 230 V AC |
| B. | 60 KV AC |
| C. | 230 V DC |
| D. | 60 KV DC |
| Answer» E. | |
| 496. |
_Combustion reaction of fuels is a/an __________ reaction.$? |
| A. | Auto catalytic |
| B. | Exothermic |
| C. | Endothermic |
| D. | None of these |
| Answer» C. Endothermic | |
| 497. |
_The function of secondary combustion air is to$? |
| A. | Pneumatically convey the pulverised coal |
| B. | Completely burn the volatile matter |
| C. | Burn the lumpy coal |
| D. | None of these |
| Answer» C. Burn the lumpy coal | |
| 498. |
_Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.$? |
| A. | 3 & 10 |
| B. | 10 & 3 |
| C. | 10 & 20 |
| D. | 15 & 8 |
| Answer» C. 10 & 20 | |
| 499. |
_Fixed carbon in coal is defined as$? |
| A. | That present in volatile matters |
| B. | The total quantity of carbon present in the coal |
| C. | Hundred minus the percentage of volatile matter, ash and moisture |
| D. | The one which is present in the residue after combustion |
| Answer» D. The one which is present in the residue after combustion | |
| 500. |
_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 | |