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.
| 251. |
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 | |
| 252. |
Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.%! |
| A. | 3-5 |
| B. | 25-30 |
| C. | 60-65 |
| D. | 95-100 |
| Answer» C. 60-65 | |
| 253. |
Natural draught produced by a chimney depends upon the%! |
| A. | Density of the chimney gases |
| B. | Height of the chimney |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 254. |
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 | |
| 255. |
Size of blast furnace grade coke is __________ mm.%! |
| A. | 25-80 |
| B. | 0-15 |
| C. | 15-25 |
| D. | >100 |
| Answer» B. 0-15 | |
| 256. |
As the equilibrium moisture content of the coal increases, its%! |
| A. | Calorific value increases |
| B. | Swelling number decreases |
| C. | Swelling number increases |
| D. | Bulk density decreases |
| Answer» C. Swelling number increases | |
| 257. |
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 | |
| 258. |
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.%! |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 75 |
| Answer» C. 50 | |
| 259. |
'Fat' coal means a coal having%! |
| A. | Low calorific value |
| B. | High volatile matter |
| C. | Low ash content |
| D. | Non smoking tendency |
| Answer» C. Low ash content | |
| 260. |
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 of the above |
| Answer» B. Washing lump coal (> 80 mm size) | |
| 261. |
Preheating of combustion air is done to%! |
| A. | Increase the adiabatic flame temperature |
| B. | Increase the calorific value of the fuel |
| C. | Complete the combustion of fuel |
| D. | Reduce its requirement for effecting the complete combustion |
| Answer» B. Increase the calorific value of the fuel | |
| 262. |
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 | |
| 263. |
Hard coke is manufactured from%! |
| A. | Lignite |
| B. | Bituminous coal |
| C. | Semi-anthracite |
| D. | Anthracite |
| Answer» C. Semi-anthracite | |
| 264. |
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 | |
| 265. |
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. | |
| 266. |
Advantages of fluidised bed combustion are%! |
| A. | Reduced NOx formation in flue gas |
| B. | Lower furnace operating temperature |
| C. | High heat transfer rate |
| D. | All of the above |
| Answer» E. | |
| 267. |
*$_With increase in C/H ratio of a fuel, the amount of CO‚ÇÇ formed on its complete combustion? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | Either A or B, depends on other factors |
| Answer» B. Decreases | |
| 268. |
*$_In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.? |
| A. | Difference in gross & net calorific value of the coke oven gas |
| B. | Free carbon content in tar |
| C. | Yield percentage of coke |
| D. | Yield of ammonia present in coke oven gas |
| Answer» B. Free carbon content in tar | |
| 269. |
*$_Which of the following oil gasification processes is non-catalytic?? |
| A. | Semet-Solvay process |
| B. | Segas process |
| C. | Onia-Gegi process |
| D. | Steam reforming of naphtha |
| Answer» B. Segas process | |
| 270. |
*$_Blast furnace gas constitutes mainly of? |
| A. | N‚ÇÇ & CH‚ÇÑ |
| B. | N‚ÇÇ & H‚ÇÇ |
| C. | N‚ÇÇ & CO |
| D. | CH‚ÇÑ & CO‚ÇÇ |
| Answer» D. CH‚Äö√á√ë & CO‚Äö√á√á | |
| 271. |
*$_Low temperature oxidation of coal resulting from bad storage conditions does not decrease its? |
| A. | Caking power |
| B. | Calorific value |
| C. | Hydrogen content |
| D. | Oxygen content |
| Answer» E. | |
| 272. |
*$_Naphthalene recovered from coke oven gas is used? |
| A. | As moisture proof coating on fibres |
| B. | As moth balls (insecticides) |
| C. | As a fuel in furnaces |
| D. | For making electrodes |
| Answer» C. As a fuel in furnaces | |
| 273. |
*$_Main use of hard coke produced by high temperature carbonisation is in the? |
| A. | Iron blast furnace |
| B. | Cupola in foundaries |
| C. | Sinter making |
| D. | Domestic ovens |
| Answer» B. Cupola in foundaries | |
| 274. |
*$_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 | |
| 275. |
*$_With increase in calorific value of fuels, their adiabatic flame temperatures? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | May increase or decrease ; depends on the quantity of products of combustion |
| Answer» E. | |
| 276. |
*$_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 | |
| 277. |
*$_Dry air required to burn 1 kg of carbon completely may be around __________ kg.? |
| A. | 11 |
| B. | 2 |
| C. | 20 |
| D. | 38 |
| Answer» B. 2 | |
| 278. |
*$_The maximum adiabatic flame temperature in air as compared to that in pure oxygen is? |
| A. | Much lower |
| B. | Much higher |
| C. | Same |
| D. | Either lower or higher, depends on the type of fuel |
| Answer» B. Much higher | |
| 279. |
*$_Steam is intermittently admitted into the fuel bed during the production of producer gas to? |
| A. | Convert CO to CO‚ÇÇ |
| B. | Increase the combustion rate |
| C. | Increase the gas production rate |
| D. | Minimise the chances of clinker formation |
| Answer» E. | |
| 280. |
*$___________ present in coal is not determined in its ultimate analysis.? |
| A. | Fixed carbon |
| B. | Total carbon |
| C. | Hydrogen |
| D. | Nitrogen |
| Answer» B. Total carbon | |
| 281. |
*$_In high temperature carbonisation (as compared to low temperature carbonisation) of coal? |
| A. | Coke oven gas yield is more |
| B. | Tar yield is less but free carbon in tar is more |
| C. | Calorific value of coke oven gas is less |
| D. | All of the above |
| Answer» E. | |
| 282. |
*$_Insitu theory and drift theory are related to the? |
| A. | Origin of petroleum oil |
| B. | Origin of coal |
| C. | Coalification |
| D. | Variation of coal quality with depth |
| Answer» C. Coalification | |
| 283. |
*$_Efficient burning of anthracite coal requires? |
| A. | Low preheat of air |
| B. | Fine grinding |
| C. | High excess air |
| D. | All of the above |
| Answer» C. High excess air | |
| 284. |
*$_The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.? |
| A. | Fast & high |
| B. | Slow & low |
| C. | Slow & high |
| D. | Fast & slow |
| Answer» B. Slow & low | |
| 285. |
*$_The fuel ratio of a coal is? |
| A. | The ratio of its percentage of fixed carbon to that of volatile matter |
| B. | Helpful in estimation of its rank |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 286. |
*$_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 | |
| 287. |
*$_Narrow coke ovens as compared to wider coke ovens? |
| A. | Produce smaller coke |
| B. | Produce stronger coke |
| C. | Require less time of carbonisation |
| D. | All of the above |
| Answer» E. | |
| 288. |
*$_Which of the following gaseous fuels has the lowest calorific value?? |
| A. | Gobar gas |
| B. | Refinery gas |
| C. | Converter gas |
| D. | Blast furnace gas |
| Answer» E. | |
| 289. |
*$_When the coal is heated in absence of air, it is called its? |
| A. | Deoxidation |
| B. | Gasification |
| C. | Coalification |
| D. | Carbonisation |
| Answer» E. | |
| 290. |
*$_Short/intense flame is produced during combustion of gaseous fuel by using? |
| A. | High amount/current of combustion air |
| B. | Low amount/current of combustion air |
| C. | Preheated secondary air |
| D. | Very little excess air |
| Answer» B. Low amount/current of combustion air | |
| 291. |
*$_Yield of charcoal in high temperature carbonisation of wood is about __________ percent.? |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 75 |
| Answer» C. 50 | |
| 292. |
*$_Size of blast furnace grade coke is __________ mm.? |
| A. | 25-80 |
| B. | 0-15 |
| C. | 15-25 |
| D. | >100 |
| Answer» B. 0-15 | |
| 293. |
*$_As the equilibrium moisture content of the coal increases, its? |
| A. | Calorific value increases |
| B. | Swelling number decreases |
| C. | Swelling number increases |
| D. | Bulk density decreases |
| Answer» C. Swelling number increases | |
| 294. |
*$_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 | |
| 295. |
*$_Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.? |
| A. | 400-500 |
| B. | 900-1000 |
| C. | 1400-1500 |
| D. | 1700-1800 |
| Answer» C. 1400-1500 | |
| 296. |
*$_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. | |
| 297. |
*$_Calorific value of? |
| A. | Light paraffinic fuel oils is equal to that of equivalent olefins |
| B. | N-paraffin is lower than that of iso-paraffins of the same compounds |
| C. | Light paraffinic fuel oils is higher than that of equivalent olefins |
| D. | Light paraffinic fuel oils is lower than that of equivalent olefins |
| Answer» D. Light paraffinic fuel oils is lower than that of equivalent olefins | |
| 298. |
*$_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 | |
| 299. |
*$_Coking coals are invariably? |
| A. | Lignites |
| B. | Bituminous coals |
| C. | Semi-anthracites |
| D. | Anthracites |
| Answer» C. Semi-anthracites | |
| 300. |
*$_The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively? |
| A. | CO‚ÇÇ, O‚ÇÇ, CO |
| B. | CO, O‚ÇÇ, CO‚ÇÇ |
| C. | CO‚ÇÇ, CO, O‚ÇÇ |
| D. | O‚ÇÇ, CO‚ÇÇ, CO |
| Answer» B. CO, O‚Äö√á√á, CO‚Äö√á√á | |