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.
| 301. |
*$_Fuel for a fast breeder nuclear reactor is? |
| A. | Plutonium |
| B. | Uranium |
| C. | Radium |
| D. | Neptunium |
| Answer» B. Uranium | |
| 302. |
*$_Beehive coke oven? |
| A. | Facilitates by-products recovery |
| B. | Takes 2-3 days for coking of coal but requires no external fuel for heating |
| C. | Gives larger yield of coke (around 85%) as compared to by-product ovens |
| D. | Produces coke with very poor strength |
| Answer» C. Gives larger yield of coke (around 85%) as compared to by-product ovens | |
| 303. |
*$_Froth floatation is used for? |
| A. | Washing fine coal dust (< 0.5 mm size) |
| B. | Washing lump coal (> 80 mm size) |
| C. | Removing ash from the coal based on difference in specific gravity of coal and ash |
| D. | All of the above |
| Answer» B. Washing lump coal (> 80 mm size) | |
| 304. |
*$_'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 | |
| 305. |
*$_Advantages of fluidised bed combustion are? |
| A. | Reduced NOx formation in flue gas |
| B. | Lower furnace operating temperature |
| C. | High heat transfer rate |
| D. | All of the above |
| Answer» E. | |
| 306. |
*$_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. | |
| 307. |
*$_Overfire burning in a furnace is a phenomenon characterised by the? |
| A. | Supply of excess fuel |
| B. | Supply of excess air |
| C. | Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air |
| D. | None of these |
| Answer» D. None of these | |
| 308. |
*$_Hard coke is manufactured from? |
| A. | Lignite |
| B. | Bituminous coal |
| C. | Semi-anthracite |
| D. | Anthracite |
| Answer» C. Semi-anthracite | |
| 309. |
*$_Cannel coal and boghead coal are the examples of? |
| A. | Humic coals |
| B. | Liptobiolites |
| C. | Sapropelic coals |
| D. | None of these |
| Answer» D. None of these | |
| 310. |
*$_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 | |
| 311. |
*$_The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.? |
| A. | 100 to 150 |
| B. | 350 to 450 |
| C. | 550 to 650 |
| D. | 700 to 850 |
| Answer» C. 550 to 650 | |
| 312. |
*$_Flue gas from the heating chamber of byproduct coke ovens is removed by? |
| A. | Forced draft fan |
| B. | Induced draft fan |
| C. | Steam ejector |
| D. | Natural draft |
| Answer» E. | |
| 313. |
*$_Coking time in narrow by-product coke ovens is around __________ hours.? |
| A. | 18 |
| B. | 48 |
| C. | 8 |
| D. | 80 |
| Answer» B. 48 | |
| 314. |
*$_Atomising steam to fuel oil ratio in a burner should be around? |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 3.5 |
| Answer» B. 1.5 | |
| 315. |
*$_'Fat coals' are those coals which have very high? |
| A. | Caking capacity |
| B. | Volatile matter content |
| C. | Fusion point of its ash |
| D. | Inherent moisture content |
| Answer» B. Volatile matter content | |
| 316. |
*$_A carbonaceous fuel (containing no H‚ÇÇ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO‚ÇÇ. It means that? |
| A. | 21% excess air has been used for combustion |
| B. | 21% excess oxygen has been used for combustion |
| C. | Complete combustion of fuel has taken place |
| D. | No excess air has been used for combustion |
| Answer» D. No excess air has been used for combustion | |
| 317. |
*$_Critical Air Blast (CAB) value of coke is a direct measure of its? |
| A. | Reactivity |
| B. | Hardness |
| C. | Strength |
| D. | None of these |
| Answer» B. Hardness | |
| 318. |
*$_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. | |
| 319. |
*/*_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 | |
| 320. |
*/*_In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing? |
| A. | CO |
| B. | CO‚ÇÇ |
| C. | O‚ÇÇ |
| D. | H‚ÇÇO |
| Answer» B. CO‚Äö√á√á | |
| 321. |
*/*_Which of the following coal gasification processes will produce gas having maximum methane content?? |
| A. | Winkler process |
| B. | Lurgi process |
| C. | Kopper-Totzek process |
| D. | All of the above |
| Answer» C. Kopper-Totzek process | |
| 322. |
*/*_For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?? |
| A. | Propane and acetylene |
| B. | Propane and LPG |
| C. | Sewage gas and gobar gas |
| D. | B.F. gas and coke oven gas |
| Answer» B. Propane and LPG | |
| 323. |
*/*_Moisture loss is determined by the? |
| A. | Humidity of combustion air |
| B. | Moisture content of fuel |
| C. | Both A and B |
| D. | The water formed by combustion reaction |
| Answer» D. The water formed by combustion reaction | |
| 324. |
*/*_A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having? |
| A. | Higher methane content and thus higher calorific value |
| B. | Higher carbon monoxide content |
| C. | Lower carbon dioxide content |
| D. | None of these |
| Answer» B. Higher carbon monoxide content | |
| 325. |
*/*_Which is the most matured coal?? |
| A. | Lignite |
| B. | Bituminous |
| C. | Semi-anthracite |
| D. | Anthracite |
| Answer» E. | |
| 326. |
*/*_Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain? |
| A. | CO |
| B. | CO‚ÇÇ |
| C. | H‚ÇÇO |
| D. | Both B & C |
| Answer» E. | |
| 327. |
*/*_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 | |
| 328. |
*/*_Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as? |
| A. | M = 1.8 A |
| B. | M = 0.5 A |
| C. | M = 1.1 A |
| D. | M = A |
| Answer» D. M = A | |
| 329. |
*/*_Largest constituent of blast furnace gas is? |
| A. | N‚ÇÇ |
| B. | CO |
| C. | CO‚ÇÇ |
| D. | H‚ÇÇ |
| Answer» B. CO | |
| 330. |
*/*_Presence of free moisture in coal is most disadvantageous during? |
| A. | Its pulverisation (as it requires more power) |
| B. | Combustion of fire slacks on the grates |
| C. | Handling (e.g. when emptying wagons) |
| D. | None of these |
| Answer» B. Combustion of fire slacks on the grates | |
| 331. |
*/*_For long flame and easy ignition, the coal used should have? |
| A. | High volatile matter |
| B. | Low ash |
| C. | High calorific value |
| D. | High ash |
| Answer» B. Low ash | |
| 332. |
*/*_Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.? |
| A. | 30 |
| B. | 300 |
| C. | 3000 |
| D. | 30, 000 |
| Answer» C. 3000 | |
| 333. |
*/*_Desirable "Micum Index" values of metal-lurical coke are? |
| A. | M40 > 78% and M10 < 10% |
| B. | M40 > 4% and M10 < 80% |
| C. | M40 > 10% and M10 < 78% |
| D. | M40 > 98% and M10 < 2% |
| Answer» B. M40 > 4% and M10 < 80% | |
| 334. |
*/*_Low temperature carbonisation? |
| A. | Is mainly for producing the smokeless domestic coke |
| B. | Is meant for the production of 'metallurgical coke' |
| C. | Produces higher quantity of gas than high temperature carbonisation |
| D. | Produces less quantity of tar than high temperature carbonisation |
| Answer» B. Is meant for the production of 'metallurgical coke' | |
| 335. |
*/*_Percentage of nitrogen in blast furnace gas may be around? |
| A. | 5 |
| B. | 25 |
| C. | 55 |
| D. | 80 |
| Answer» D. 80 | |
| 336. |
*/*_Mineral matter content (M) and ash content (A) in coal are approximately related as? |
| A. | M = 1.1A |
| B. | M = A |
| C. | M = 1.5A |
| D. | M = 2A |
| Answer» B. M = A | |
| 337. |
*/*_Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.? |
| A. | Entrained |
| B. | Moving |
| C. | Fixed |
| D. | Fluidised |
| Answer» B. Moving | |
| 338. |
*/*_A coal with high ash content? |
| A. | Has higher calorific value |
| B. | Is harder and stronger |
| C. | Is not subjected to washing |
| D. | Has low quantity of mineral matter |
| Answer» C. Is not subjected to washing | |
| 339. |
*/*_Preheating of __________ the flame temperature.? |
| A. | The gaseous fuel before combustion decreases |
| B. | Combustion air decreases |
| C. | Either the fuel or the air or both, increases |
| D. | Either the fuel or the air does not affect |
| Answer» D. Either the fuel or the air does not affect | |
| 340. |
*/*_Oxygen percentage (by weight) in atmospheric air is? |
| A. | 19 |
| B. | 21 |
| C. | 23 |
| D. | 29 |
| Answer» D. 29 | |
| 341. |
*/*_Which of the following coke has the least percentage of ash?? |
| A. | Petroleum coke |
| B. | Beehive coke |
| C. | Foundary coke |
| D. | Metallurgical coke |
| Answer» B. Beehive coke | |
| 342. |
*/*_The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always? |
| A. | 1 |
| B. | <1 |
| C. | > 1 |
| D. | Unpredicatable |
| Answer» C. > 1 | |
| 343. |
*/*_Low temperature oxidation of coal during storage does not decrease its? |
| A. | Oxygen content |
| B. | Caking power |
| C. | Calorific value |
| D. | None of these |
| Answer» E. | |
| 344. |
*/*_When incomplete combustion loss is high, the flue gas analysis shows large amount of? |
| A. | CO‚ÇÇ |
| B. | CO |
| C. | O‚ÇÇ |
| D. | C |
| Answer» C. O‚Äö√á√á | |
| 345. |
*/*_The reaction, C + CO‚ÇÇ ‚ü∑ 2CO, taking place during coal gasification is called the __________ reaction.n.? |
| A. | Neumann reversal |
| B. | Shift conversion |
| C. | Boudouard |
| D. | Reduction |
| Answer» D. Reduction | |
| 346. |
*/*_Main constituents of benzol are? |
| A. | Benzene, toluene & xylene |
| B. | Tar & creosote |
| C. | Ammonia & phenol |
| D. | Anthracene & phenol |
| Answer» B. Tar & creosote | |
| 347. |
*/*_Very __________ coals are completely devoid of cokability i.e, it is non coking.? |
| A. | Young |
| B. | Mature |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 348. |
*/*_Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.? |
| A. | 1000 |
| B. | 4000 |
| C. | 6000 |
| D. | 8000 |
| Answer» C. 6000 | |
| 349. |
*/*_Combustion of pulverised coal as compared to that of lump coal? |
| A. | Develops a non-luminous flame |
| B. | Develops a low temperature flame |
| C. | Can be done with less excess air |
| D. | Provides a lower rate of heat release |
| Answer» D. Provides a lower rate of heat release | |
| 350. |
*/*_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 | |