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.
| 201. |
In low temperature carbonisation of coal, the________________? |
| A. | Yield of coke oven gas is 290 Nm3 /ton dry coal |
| B. | Volatile matter in coke is zero |
| C. | Temperature maintained is 700°C |
| D. | Yield of tar is about 3% of dry coal |
| Answer» D. Yield of tar is about 3% of dry coal | |
| 202. |
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 | |
| 203. |
In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________? |
| A. | Ammonia yield is more |
| B. | Aliphatic tar is produced |
| C. | Free carbon in tar is more |
| D. | All A., B. and C. |
| Answer» C. Free carbon in tar is more | |
| 204. |
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. | H2 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 | |
| 205. |
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. | |
| 206. |
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the______________? |
| A. | Gas yield is less |
| B. | Tar yield is more |
| C. | Ignition temperature of coke produced is less |
| D. | Aromatic content of tar produced is more |
| Answer» E. | |
| 207. |
In general, the limit of inflammability/explosion limit of fuel gases is widened by the__________________? |
| A. | Increase in gas pressure |
| B. | Increase in temperature (i.e. preheating) |
| C. | Use of pure oxygen for combustion instead of air |
| D. | All A., B. & C. |
| Answer» E. | |
| 208. |
In flue gas analysis by Orsat’s apparatus, oxygen is absorbed by____________________? |
| A. | Potassium hydroxide |
| B. | Cuprous chloride |
| C. | Alkaline pyrogallol solution |
| D. | None of these |
| Answer» D. None of these | |
| 209. |
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 | |
| 210. |
In flue gas analysis by Orsat’s apparatus, carbon dioxide is absorbed by______________________? |
| A. | Potassium hydroxide |
| B. | Dilute potassium carbonate |
| C. | Cuprous chloride |
| D. | Alkaline pyrogallol solution |
| Answer» B. Dilute potassium carbonate | |
| 211. |
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 | |
| 212. |
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________? |
| A. | Caking index |
| B. | Yield of carbonised products |
| C. | Friability & oxygen content |
| D. | Calorific value |
| Answer» D. Calorific value | |
| 213. |
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 | |
| 214. |
Ignition temperature of a fuel in air is ______________ that in pure oxygen? |
| A. | More than |
| B. | Less than |
| C. | Equal to |
| D. | Either more or less; depends on the type of fuel |
| Answer» B. Less than | |
| 215. |
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________? |
| A. | Low |
| B. | High |
| C. | Very high, if the fuel is of low calorific value |
| D. | None of these |
| Answer» B. High | |
| 216. |
If oxygen content in the flue gas rises too high, fuel is being wasted by _______________? |
| A. | Incomplete combustion |
| B. | Dry gas/stack gas loss |
| C. | Moisture loss |
| D. | None of these |
| Answer» C. Moisture loss | |
| 217. |
If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as___________________? |
| A. | O2 |
| B. | CO |
| C. | N2 |
| D. | SO2 |
| Answer» E. | |
| 218. |
Highly reactive coke have lower ___________________? |
| A. | Porosity |
| B. | Coke reactivity index (CRI) |
| C. | Critical air blast (CAB) value |
| D. | Both B. and C. |
| Answer» D. Both B. and C. | |
| 219. |
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. | |
| 220. |
Higher percentage of ash in coal meant for the production of metallurgical grade coke ___________________? |
| A. | Decreases the hardness of coke |
| B. | Decreases the abrasion resistance of coke |
| C. | Causes brittleness in steel |
| D. | None of these |
| Answer» E. | |
| 221. |
Higher fuel combustion efficiency cannot be achieved by_________________? |
| A. | Preheating of fuel gases & combustion air |
| B. | Reducing sulphur content in the fuel |
| C. | Adopting proper fuel firing technique & fuel preparation |
| D. | Supplying correct amount of combustion air |
| Answer» C. Adopting proper fuel firing technique & fuel preparation | |
| 222. |
Higher efficiency in the combustion of solid fuel cannot be achieved by________________? |
| A. | Proper fuel preparation |
| B. | Keeping the flue gas exhaust temperature very high |
| C. | Adopting efficient-fuel firing technique & equipment |
| D. | Supplying correct quantity of combustion air |
| Answer» C. Adopting efficient-fuel firing technique & equipment | |
| 223. |
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. | |
| 224. |
High temperature carbonisation of coal takes place at _______________ °C? |
| A. | 2000 |
| B. | 600 |
| C. | 1100 |
| D. | 1600 |
| Answer» D. 1600 | |
| 225. |
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. | |
| 226. |
High sulphur content in a fuel ______________ of the flue gases? |
| A. | Decreases the dew point |
| B. | Increases the dew point |
| C. | Reduces the combustion efficiency by limiting the permissible temperature reduction |
| D. | Both B. and C. |
| Answer» E. | |
| 227. |
High rate of heating of coke ovens____________________? |
| A. | May damage its walls due to abrupt excessive swelling of coal |
| B. | Produces larger size coke |
| C. | Increases the time of carbonisation |
| D. | None of these |
| Answer» B. Produces larger size coke | |
| 228. |
High pressure coal gasification is employed in ________________ process? |
| A. | Lurgi |
| B. | Kopper-Totzek |
| C. | Winkler |
| D. | None of these |
| Answer» B. Kopper-Totzek | |
| 229. |
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 | |
| 230. |
High ash containing coke____________________? |
| A. | Produces more slag when used in the blast furnace |
| B. | Has poor strength and abrasion resistance |
| C. | Is desirable in producer gas manufacture |
| D. | None of these |
| Answer» B. Has poor strength and abrasion resistance | |
| 231. |
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 | |
| 232. |
High amount of sulphur and phosphorous in coke causes ____________________ ? |
| A. | Decrease in its calorific value |
| B. | Increase in its strength |
| C. | Brittleness of steel made by using it |
| D. | None of these |
| Answer» D. None of these | |
| 233. |
Height of coke oven is limited (say maximum upto 7 metres) mainly by the_____________________? |
| A. | Problem of uniform heating along its height |
| B. | Structural strength of silica bricks |
| C. | Problem in door cleaning |
| D. | Buckling of ram of pusher car at the time of coke pushing |
| Answer» B. Structural strength of silica bricks | |
| 234. |
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 | |
| 235. |
_____________ has the widest inflammability limit (explosion limit) of all the gases? |
| A. | Hydrogen |
| B. | Carbon monoxide |
| C. | Acetylene |
| D. | Methane |
| Answer» D. Methane | |
| 236. |
Hard pitch is used for making_____________________? |
| A. | Pulverised fuel |
| B. | Perfumes |
| C. | Insecticides |
| D. | Plastics |
| Answer» B. Perfumes | |
| 237. |
Hard coke is manufactured from___________________? |
| A. | Lignite |
| B. | Bituminous coal |
| C. | Semi-anthracite |
| D. | Anthracite |
| Answer» C. Semi-anthracite | |
| 238. |
Gross & net calorific value is the same for___________________? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | L.D. converter gas |
| D. | None of these |
| Answer» D. None of these | |
| 239. |
Gross heating value of coal is ______________ the net heating value? |
| A. | Higher than |
| B. | Lower than |
| C. | Same as |
| D. | None of these |
| Answer» B. Lower than | |
| 240. |
Gross calorific value will be equal to the net calorific value for __________________? |
| A. | H2 |
| B. | C2H2 |
| C. | CO |
| D. | C2H6 |
| Answer» D. C2H6 | |
| 241. |
Gross and net calorific value of a fuel will be the same__________________? |
| A. | If its ash content is zero |
| B. | If its carbon content is very low |
| C. | If its hydrogen/hydrogen compound content is zero |
| D. | Under no circumstances |
| Answer» D. Under no circumstances | |
| 242. |
Grindability index of a coal is 100. It implies that the ___________________? |
| A. | Coal can be pulverised with great difficulty |
| B. | Coal can’t be pulverised |
| C. | Coal can be easily pulverised |
| D. | Power consumption in grinding the coal will be very high |
| Answer» D. Power consumption in grinding the coal will be very high | |
| 243. |
Gray King Assay and Swelling Index of a coal is a measure of its ____________________? |
| A. | Swelling characteristics |
| B. | Abradability |
| C. | Agglutinating properties |
| D. | Resistance to impact breakage |
| Answer» B. Abradability | |
| 244. |
Gobar gas is produced by the _______________ of ‘gobar’ (cow dung) ? |
| A. | Hydrolysis |
| B. | Fermentation |
| C. | Oxidation |
| D. | Dehydration |
| Answer» C. Oxidation | |
| 245. |
Gobar gas is produced by the ______________ of cow dung? |
| A. | Fermentation |
| B. | Oxidation |
| C. | Hydrogenation |
| D. | None of these |
| Answer» B. Oxidation | |
| 246. |
Gobar gas constitutes mainly of___________________? |
| A. | CH4 & CO2 |
| B. | CO & CO2 |
| C. | CH4 & N2 |
| D. | CO & N2 |
| Answer» B. CO & CO2 | |
| 247. |
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 | |
| 248. |
Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)? |
| A. | 150 |
| B. | 1500 |
| C. | 3500 |
| D. | 5000 |
| Answer» C. 3500 | |
| 249. |
Fussain _____________________? |
| A. | Is friable, charcoal like substance |
| B. | Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal |
| C. | Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation |
| D. | All A., B. and C. |
| Answer» E. | |
| 250. |
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. | |