MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1251. |
A batch reactor is suitable for |
| A. | achieving cent percent conversion of reactants into products. |
| B. | large scale gaseous phase reactions. |
| C. | liquid phase reactions. |
| D. | obtaining uniform polymerisation products in highly exothermic reactions. |
| Answer» D. obtaining uniform polymerisation products in highly exothermic reactions. | |
| 1252. |
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by |
| A. | biological oxygen pond. |
| B. | aerated lagoons. |
| C. | trickling filters. |
| D. | gravity separator having oil skimming devices. |
| Answer» E. | |
| 1253. |
Dust collection efficiency of a cyclone separator depends upon its |
| A. | diameter. |
| B. | inlet gas velocity. |
| C. | overall height. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 1254. |
Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes |
| A. | blood poisoning. |
| B. | anaemia. |
| C. | nervous system disorder. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1255. |
Catalytic desulphurisation process used for sweetening of straight run gasoline and kerosene uses __________ as catalyst. |
| A. | bauxite |
| B. | fuller's earth |
| C. | activated clay |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 1256. |
Crude oil is transported inland from oil field to refineries, mainly by the |
| A. | road tankers |
| B. | rail tankers |
| C. | underground pipelines |
| D. | none of these |
| Answer» D. none of these | |
| 1257. |
For series reaction, the relative yield |
| A. | is always greater for plug-flow reactor than for the single CSTR of the same volume. |
| B. | statement in (a) is wrong. |
| C. | decreases with increasing conversion. |
| D. | both (a) and (c) hold good. |
| Answer» E. | |
| 1258. |
Smoke volatility index is equal to smoke point plus |
| A. | 0.42 x(% distilled at 204 C) |
| B. | 5 mm |
| C. | 0.84 x (% distilled at 204 C) |
| D. | 10 mm. approximately |
| Answer» B. 5 mm | |
| 1259. |
Paraffin base crude oil as compared to asphalt base crude gives |
| A. | higher yield of straight run gasoline. |
| B. | higher octane number gasoline. |
| C. | lower viscosity index lube oil. |
| D. | poorer yield of lube oil. |
| Answer» B. higher octane number gasoline. | |
| 1260. |
During crystallisation, formation of crystal can occur in __________ solution only. |
| A. | saturated |
| B. | supersaturated |
| C. | undersaturated |
| D. | all (a), (b) and (c) |
| Answer» C. undersaturated | |
| 1261. |
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent. |
| A. | 5 |
| B. | 25 |
| C. | 55 |
| D. | 75 |
| Answer» C. 55 | |
| 1262. |
Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter. |
| A. | filtering |
| B. | washing |
| C. | drying |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 1263. |
During conversion of ammonium carbamate into urea, presence of large excess of water |
| A. | increases the yield of urea. |
| B. | adversely affects the yield of urea. |
| C. | reduces the evaporator load by diluting the urea solution. |
| D. | does not affect the yield of urea. |
| Answer» C. reduces the evaporator load by diluting the urea solution. | |
| 1264. |
Coals used for the generation of producer gas should have |
| A. | high caking index. |
| B. | low fusion point of ash. |
| C. | high volatile matter content. |
| D. | very low ash content (8-10%). |
| Answer» D. very low ash content (8-10%). | |
| 1265. |
A coal having higher volatile matter content will necessarily have lower |
| A. | ash fusion temperature. |
| B. | calorific value. |
| C. | ignition temperature. |
| D. | caking index. |
| Answer» D. caking index. | |
| 1266. |
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. | |
| 1267. |
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. | |
| 1268. |
Anthracite coal |
| A. | contains more volatile matter than bituminous coal. |
| B. | ignites more easily than bituminous coal. |
| C. | is essentially a coking coal. |
| D. | burns with short, bluish, yellow-tipped flame producing very little smoke. |
| Answer» E. | |
| 1269. |
Number of macrocomponents present in coal according to Stopes are |
| A. | four |
| B. | five |
| C. | six |
| D. | two |
| Answer» B. five | |
| 1270. |
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. | |
| 1271. |
Yield of charcoal in high temperature carbonisation of wood is about __________ percent. |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 75 |
| Answer» C. 50 | |
| 1272. |
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 | |
| 1273. |
Calorific value of bituminous coal may be around __________ Kcal/kg. |
| A. | 500 |
| B. | 1500 |
| C. | 6500 |
| D. | 20000 |
| Answer» D. 20000 | |
| 1274. |
Gobar gas is produced by the __________ of cown dung. |
| A. | fermentation |
| B. | oxidation |
| C. | hydrogenation |
| D. | none of these |
| Answer» B. oxidation | |
| 1275. |
Which of the following is not a binder for coal briquetting ? |
| A. | Coal tar |
| B. | Bitumen |
| C. | Molasses |
| D. | None of these |
| Answer» E. | |
| 1276. |
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) | |
| 1277. |
Orsat apparatus is meant for |
| A. | gravimetric analysis of flue gas. |
| B. | finding out combustion efficiency. |
| C. | direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride. |
| D. | none of these. |
| Answer» E. | |
| 1278. |
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. | |
| 1279. |
Assam coals suffers mainly from the disadvantage of high __________ content. |
| A. | ash |
| B. | volatile matter |
| C. | sulphur (4-6%) |
| D. | moisture |
| Answer» D. moisture | |
| 1280. |
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. | |
| 1281. |
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. | |
| 1282. |
A sooty flame can be made non-luminous by |
| A. | admitting more gas. |
| B. | shutting gas supply. |
| C. | admitting more air. |
| D. | shutting air supply. |
| Answer» D. shutting air supply. | |
| 1283. |
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. | |
| 1284. |
Washing of coal is done to reduce the |
| A. | inherent impurities |
| B. | adhering impurities |
| C. | mineral matter |
| D. | both (b) and (c) |
| Answer» E. | |
| 1285. |
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 | |
| 1286. |
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. | |
| 1287. |
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. | |
| 1288. |
Caking coal is desirable for |
| A. | burning on travelling grate. |
| B. | coke making. |
| C. | burning on firebars. |
| D. | all (a), (b) and (c). |
| Answer» C. burning on firebars. | |
| 1289. |
"Micum Index" of a coke is a measure of its |
| A. | reactivity. |
| B. | porosity. |
| C. | bulk density. |
| D. | hardness & strength. |
| Answer» E. | |
| 1290. |
'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 | |
| 1291. |
Volatile matter content in coking coal may be about __________ percent. |
| A. | 1 |
| B. | 7 |
| C. | 22 |
| D. | 46 |
| Answer» D. 46 | |
| 1292. |
__________ is used as jet engine fuel. |
| A. | Petrol |
| B. | Diesel |
| C. | Kerosene |
| D. | LPG |
| Answer» D. LPG | |
| 1293. |
Fischer-Tropsch method aims at the |
| A. | gasification of coal. |
| B. | synthesis of gasoline (from water gas). |
| C. | hydrogenation of coal to produce gasoline. |
| D. | none of these. |
| Answer» C. hydrogenation of coal to produce gasoline. | |
| 1294. |
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. | |
| 1295. |
Coke made in narrower by-product coke ovens (as compared to wider ovens) is |
| A. | less reactive |
| B. | stronger |
| C. | smaller in size |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 1296. |
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 | |
| 1297. |
The optimum percentage of excess air for combustion depends upon the __________ of the fuel. |
| A. | type (solid, liquid or gaseous) |
| B. | calorific value |
| C. | sulphur content |
| D. | ignition temperature |
| Answer» B. calorific value | |
| 1298. |
Which of the following is unsuitable fuel for producer gas manufacture ? |
| A. | Coke. |
| B. | Anthracite. |
| C. | Coal having low fusion point of its ash. |
| D. | Coal having high fusion point of its ash. |
| Answer» D. Coal having high fusion point of its ash. | |
| 1299. |
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15 C. |
| A. | sensible |
| B. | latent |
| C. | sensible and latent |
| D. | none of these |
| Answer» D. none of these | |
| 1300. |
A good metallurgical coke |
| A. | should have high porosity. |
| B. | should be brittle. |
| C. | must contain moderate quantities of ash, moisture, sulphur and volatile matters. |
| D. | should have low fusion point of its ash. |
| Answer» B. should be brittle. | |