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.
| 351. |
Bunsen burner is an example of a/an _____________ burner? |
| A. | Inside mixing/premix type |
| B. | Outside mixing/diffusion flame/nozzle mix type |
| C. | Rotary cup |
| D. | Submerged combustion |
| Answer» B. Outside mixing/diffusion flame/nozzle mix type | |
| 352. |
Bulk density of pulverised coal may be about ______________ kg/m3? |
| A. | 100 |
| B. | 500 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 353. |
Bright coal__________________? |
| A. | Contains more than 90% durain |
| B. | Contains more than 90% fussain |
| C. | Contains mainly vitrain & clarain and is generally coking |
| D. | Is non-coking |
| Answer» D. Is non-coking | |
| 354. |
Bomb calorimeter can be used to determine the _____________ of the coal? |
| A. | Sulphur content |
| B. | Calorific value |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 355. |
Bomb calorimeter is used to determine the (where, GCV – Gross Calorific Value. NCV – Net Calorific Value.) ? |
| A. | GCV at constant pressure |
| B. | GCV at constant volume |
| C. | NCV at constant pressure |
| D. | NCV at constant volume |
| Answer» C. NCV at constant pressure | |
| 356. |
Bomb calorimeter is used for the determination of calorific value of the _____________ fuels? |
| A. | Gaseous |
| B. | Solid |
| C. | Liquid |
| D. | Both B. and C. |
| Answer» E. | |
| 357. |
Blast furnace gas is a very poisonous gas because of its predominantly high _______________ content? |
| A. | H2O |
| B. | CO2 |
| C. | CO |
| D. | CH4 |
| Answer» D. CH4 | |
| 358. |
Blast furnace gas constitutes mainly of_________________? |
| A. | N2 & CH4 |
| B. | N2 & H2 |
| C. | N2 & CO |
| D. | CH4 & CO2 |
| Answer» D. CH4 & CO2 | |
| 359. |
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. | |
| 360. |
Blast furnace gas burns with a bluish flame, because of the presence of____________________? |
| A. | CO |
| B. | CH4 |
| C. | CO2 |
| D. | S |
| Answer» B. CH4 | |
| 361. |
Blast furnace coke is made from coal by_____________________? |
| A. | Low temperature carbonisation |
| B. | High temperature carbonisation |
| C. | Medium temperature carbonisation |
| D. | Heating the coal in an oven in presence of air |
| Answer» C. Medium temperature carbonisation | |
| 362. |
Bituminous coal___________________? |
| A. | Ignites less easily than anthracite |
| B. | Is generally coking |
| C. | Burns with smoky yellow flame |
| D. | Both B. and C. |
| Answer» E. | |
| 363. |
Benzol is used_____________________? |
| A. | As a motor fuel blend |
| B. | For producing benzene, toluene & xylene by its distillation |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 364. |
Benzene is used__________________? |
| A. | As a motor fuel |
| B. | As an explosive |
| C. | For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR) |
| D. | As a perfume |
| Answer» D. As a perfume | |
| 365. |
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 | |
| 366. |
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 | |
| 367. |
Assam (India) coals suffers mainly from the disadvantage of high ______________ content? |
| A. | Ash |
| B. | Volatile matter |
| C. | Sulphur (4-6%) |
| D. | Moisture |
| Answer» D. Moisture | |
| 368. |
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. | |
| 369. |
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 | |
| 370. |
As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion _______________ for the same percentage of excess air? |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | May increase or decrease depending on the type of fuel |
| Answer» C. Remain same | |
| 371. |
Artificial draught produced by a fan can be controlled by the___________________? |
| A. | Speed of the fan |
| B. | Damper |
| C. | Variation in the pitch of the fan blades |
| D. | All A., B. and C. |
| Answer» E. | |
| 372. |
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. | |
| 373. |
Anthracite can be used for___________________? |
| A. | Recarbonising steel |
| B. | Making carbon electrodes |
| C. | Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke |
| D. | All A., B. and C. |
| Answer» E. | |
| 374. |
Ammonia content in raw coke oven gas is about _____________ gm/Nm3? |
| A. | 1 |
| B. | 5 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 375. |
Air/gas ratio for complete combustion will be the highest for__________________? |
| A. | LPG |
| B. | Gobar gas |
| C. | Coke oven gas |
| D. | Carburetted water gas |
| Answer» B. Gobar gas | |
| 376. |
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 A., B. & C. |
| Answer» E. | |
| 377. |
Adiabatic flame temperature of a fuel is dependent on the initial temperature of___________________? |
| A. | Fuel |
| B. | Air |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 378. |
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. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 379. |
Abrasion index of blast furnace coke should be around _____________ percent? |
| A. | 20 |
| B. | 35 |
| C. | 55 |
| D. | 80 |
| Answer» E. | |
| 380. |
About _____________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 381. |
Abel apparatus is used for those oils, whose flash points are ___________°F? |
| A. | < 120 |
| B. | > 120 |
| C. | > 280 |
| D. | 300-600 |
| Answer» B. > 120 | |
| 382. |
A travelling grate stoker is meant for the efficient burning of ______________ coal? |
| A. | Caking |
| B. | Pulverised |
| C. | Non-caking |
| D. | High ash |
| Answer» D. High ash | |
| 383. |
A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________? |
| A. | CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60 |
| B. | CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02 |
| C. | CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06 |
| D. | CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74 |
| Answer» C. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06 | |
| 384. |
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 | |
| 385. |
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________? |
| A. | Presence of large quantity of hydrogen in the fuel |
| B. | Low calorific value of the fuel |
| C. | High sulphur content in the fuel |
| D. | Lack of thorough mixing of fuel with air |
| Answer» E. | |
| 386. |
A good quality coal should have ___________________? |
| A. | Low fusion point of ash |
| B. | High ash content |
| C. | High sulphur |
| D. | None of these |
| Answer» E. | |
| 387. |
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 | |
| 388. |
A good metallurgical coke should have very low__________________? |
| A. | Sulphur & phosphorous content |
| B. | Porosity |
| C. | Fusion point of its ash |
| D. | Hardness & strength |
| Answer» B. Porosity | |
| 389. |
A good coking coal should have high ______________ content? |
| A. | Ash |
| B. | Sulphur & phosphorus |
| C. | Moisture |
| D. | None of these |
| Answer» E. | |
| 390. |
A gaseous fuel in order to develop luminosity on burning, must contain __________________? |
| A. | Carbon monoxide |
| B. | Hydrocarbons |
| C. | Hydrogen |
| D. | Oxygen |
| Answer» C. Hydrogen | |
| 391. |
A fuel with high heat release rate will_________________? |
| A. | Require smaller combustion chamber |
| B. | Have high calorific value |
| C. | Have high adiabatic flame temperature |
| D. | None of these |
| Answer» B. Have high calorific value | |
| 392. |
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be_________________? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Data insufficient; can’t be predicted |
| Answer» D. Data insufficient; can’t be predicted | |
| 393. |
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 | |
| 394. |
A coal with high _____________ content, would ignite most easily? |
| A. | Fixed carbon |
| B. | Volatile matter |
| C. | Ash |
| D. | Oxygen |
| Answer» C. Ash | |
| 395. |
A coal that softens and fuses on heating is_________________? |
| A. | Classified |
| B. | Carbonised |
| C. | Caking |
| D. | Non-caking |
| Answer» D. Non-caking | |
| 396. |
A coal with high ash content is undesirable, as________________? |
| A. | It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber |
| B. | The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient o |
| C. | The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besi |
| D. | All A., B. and C. |
| Answer» E. | |
| 397. |
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 | |
| 398. |
A coal having high volatile matter content will ________________? |
| A. | Give less yield of tar and gas on carbonisation |
| B. | Burn with a small non-smoky flame |
| C. | Have a very high calorific value |
| D. | None of these |
| Answer» E. | |
| 399. |
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon _________________? |
| A. | Is less liable to spontaneous combustion on storage |
| B. | Is more difficult to ignite and produces a shorter flame |
| C. | Requires smaller combustion space and less secondary air |
| D. | None of these |
| Answer» E. | |
| 400. |
A coal having higher volatile matter content, has lower_________________? |
| A. | Smoking tendency on burning |
| B. | Coke oven gas yield on carbonisation |
| C. | Chance of catching fire during storage in open space |
| D. | Ignition temperature |
| Answer» E. | |