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.
| 401. |
%_KOH solution used in orsat apparatus absorbs_% |
| A. | CO‚ÇÇ |
| B. | SO‚ÇÇ |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 402. |
%_Presence of phosphorous in metallurgical coal_% |
| A. | Is not undersirable |
| B. | Reduces its calorific value |
| C. | Badly affects the quality of steel |
| D. | Increases its caking power |
| Answer» D. Increases its caking power | |
| 403. |
_ The most matured coal out of the following is$? |
| A. | Lignite |
| B. | Semi-anthracite |
| C. | Sub-bituminous |
| D. | Bituminous |
| Answer» C. Sub-bituminous | |
| 404. |
_ Which of the following is not applicable to fluidised bed combustion of coal?$? |
| A. | It can not burn low grade coal |
| B. | It achieves higher fuel combustion efficiency |
| C. | Less heat transfer surface area is required in boilers |
| D. | None of these |
| Answer» B. It achieves higher fuel combustion efficiency | |
| 405. |
_ Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has$? |
| A. | Higher calorific value |
| B. | Lower hydrogen content |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» E. | |
| 406. |
_ Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)$? |
| 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 | |
| 407. |
_ The cooling medium used in dry quenching of coke is$? |
| A. | Nitrogen |
| B. | Air |
| C. | Phenolic water |
| D. | Carbon dioxide |
| Answer» B. Air | |
| 408. |
_ Low temperature carbonisation of coal produces$? |
| A. | Metallurgical coke |
| B. | Soft coke |
| C. | Very low calorific value coke oven gas |
| D. | No by-products |
| Answer» C. Very low calorific value coke oven gas | |
| 409. |
_ When steam is passed over coal resulting in the endothermic reaction represent by, C + H‚ÇÇO = CO + H‚ÇÇ, it is called the __________ of coal.$? |
| A. | Carbonisation |
| B. | Oxidation |
| C. | Coalification |
| D. | Gasification |
| Answer» E. | |
| 410. |
_ Combustion of pulverised fuel$? |
| A. | Requires larger combustion chamber than rich gaseous fuel |
| B. | In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel |
| C. | Suppresses the discharge of fine dust and grit into atmosphere |
| D. | All of the above |
| Answer» B. In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel | |
| 411. |
_ Coalification means the$? |
| A. | Process of conversion of lignite into anthracite |
| B. | Underground gasification of coal |
| C. | Complete combustion of coal |
| D. | Direct hydrogenation of coal |
| Answer» B. Underground gasification of coal | |
| 412. |
_ Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is$? |
| A. | 200 °F |
| B. | 200 °C |
| C. | 200 °K |
| D. | 200 °R |
| Answer» B. 200 ¬¨‚àûC | |
| 413. |
_ A coal with high ash content is undesirable, as$? |
| A. | It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber |
| B. | The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the |
| C. | The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes |
| D. | All of the above |
| Answer» E. | |
| 414. |
_ Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.$? |
| A. | 0.5 |
| B. | 10 |
| C. | 50 |
| D. | 500 |
| Answer» C. 50 | |
| 415. |
_ Fossil fuels mean$? |
| A. | Solid fuels |
| B. | Liquid fuels |
| C. | Those fuels which are found in the crust of earth |
| D. | Premature fuels with low calorific value |
| Answer» D. Premature fuels with low calorific value | |
| 416. |
_ A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.$? |
| A. | 1 to 2 |
| B. | 3 to 4 |
| C. | 5 to 15 |
| D. | 20 to 40 |
| Answer» D. 20 to 40 | |
| 417. |
_ __________ process is meant for direct hydrogenation of coal to produce liquid fuel.$? |
| A. | Fischer-Tropsch |
| B. | Bergius |
| C. | Lurgi |
| D. | None of these |
| Answer» C. Lurgi | |
| 418. |
_ Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.$? |
| A. | 15 to 25 |
| B. | 35 to 45 |
| C. | 55 to 75 |
| D. | 75 |
| Answer» C. 55 to 75 | |
| 419. |
_ Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?$? |
| A. | 2CO ‚ü∑ C + CO‚ÇÇ |
| B. | CO + H‚ÇÇO ‚ü∑ CO‚ÇÇ + H‚ÇÇ |
| C. | C + H‚ÇÇO ‚ü∑ CO + H‚ÇÇ |
| D. | C + 2H‚ÇÇO ‚ü∑ CO‚ÇÇ + 2H‚ÇÇ |
| Answer» B. CO + H‚Äö√á√áO ‚Äö√º‚àë CO‚Äö√á√á + H‚Äö√á√á | |
| 420. |
_ A coal having high volatile matter content will$? |
| 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. | |
| 421. |
_ Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.$? |
| A. | Smoke |
| B. | Temperature |
| C. | Oxygen |
| D. | Carbon monoxide |
| Answer» E. | |
| 422. |
_ Which of the following is not a manufactured fuel ?$? |
| A. | Furnace oil |
| B. | Bagasse |
| C. | Semi-coke |
| D. | Kerosene |
| Answer» C. Semi-coke | |
| 423. |
_ Which of the following is the maximum coal producing state in India?$? |
| A. | Orissa |
| B. | West Bengal |
| C. | Jharkhand |
| D. | Assam |
| Answer» D. Assam | |
| 424. |
_ Producer gas comprises mainly of$? |
| A. | CO & N‚ÇÇ |
| B. | CO & H‚ÇÇ |
| C. | CO‚ÇÇ & N‚ÇÇ |
| D. | CO‚ÇÇ & H‚ÇÇ |
| Answer» B. CO & H‚Äö√á√á | |
| 425. |
_ 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$? |
| A. | Presence of large quantity of hydrogen in the fuel |
| B. | Low calorific value of the fuel |
| C. | High sulphur content in the fuel |
| D. | Lack of thorough mixing of fuel with air |
| Answer» E. | |
| 426. |
_ The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called$? |
| A. | Fire point |
| B. | Smoke point |
| C. | Burning temperature |
| D. | Kindling temperature |
| Answer» D. Kindling temperature | |
| 427. |
_ Orsat apparatus is meant for$? |
| A. | Gravimetric analysis of flue gas |
| B. | Finding out combustion efficiency |
| C. | Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride |
| D. | None of these |
| Answer» E. | |
| 428. |
_ Largest constituent of coke oven gas is$? |
| A. | N‚ÇÇ |
| B. | H‚ÇÇ |
| C. | CH‚ÇÑ |
| D. | CO‚ÇÇ |
| Answer» C. CH‚Äö√á√ë | |
| 429. |
_ Coke having higher porosity has$? |
| A. | Lower bulk density |
| B. | Lower strength |
| C. | Higher reactivity |
| D. | All of the above |
| Answer» E. | |
| 430. |
_ Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its$? |
| A. | Caking index |
| B. | Yield of carbonised products |
| C. | Friability & oxygen content |
| D. | Calorific value |
| Answer» D. Calorific value | |
| 431. |
_ By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of$? |
| A. | Tar |
| B. | Benzol |
| C. | Ammonia |
| D. | None of these |
| Answer» D. None of these | |
| 432. |
_ Which of the following fuels is the best for burning on chain grate stoker?$? |
| A. | Non-caking coal |
| B. | Caking coal |
| C. | Coking coal |
| D. | Pulverised coal |
| Answer» B. Caking coal | |
| 433. |
_ Bomb calorimeter is used for the determination of calorific value of the __________ fuels.$? |
| A. | Gaseous |
| B. | Solid |
| C. | Liquid |
| D. | Both B and C |
| Answer» E. | |
| 434. |
_ Washing of coal decreases its$? |
| A. | Caking index |
| B. | Mineral matter content |
| C. | Ash content |
| D. | Both B and C |
| Answer» C. Ash content | |
| 435. |
_ Which of the following petrographic constituents of coal is non-coking?$? |
| A. | Vitrain |
| B. | Clarain |
| C. | Durain |
| D. | Fussain |
| Answer» E. | |
| 436. |
_ Higher efficiency in the combustion of solid fuel can not be achieved by$? |
| 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 | |
| 437. |
_ A good metallurgical coke should have very low$? |
| A. | Sulphur & phosphorous content |
| B. | Porosity |
| C. | Fusion point of its ash |
| D. | Hardness & strength |
| Answer» B. Porosity | |
| 438. |
_ Highly caking coals$? |
| A. | Produce weak coke |
| B. | Produce strong coke |
| C. | May damage the coke oven walls during carbonisation |
| D. | Both B and C |
| Answer» E. | |
| 439. |
_ A coal having high amount of volatile matter$? |
| A. | Would require smaller combustion chamber |
| B. | Produces very little of tar and gas on carbonisation |
| C. | Ignites easily and burns with long smoky flame |
| D. | All of the above |
| Answer» E. | |
| 440. |
_ Pulverised coal used in boiler firing need not have$? |
| A. | Less moisture content |
| B. | High fusion point of its ash |
| C. | High bulk density |
| D. | Lower ash content |
| Answer» C. High bulk density | |
| 441. |
_ The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to$? |
| A. | Minimise its corrosion |
| B. | Avoid radiation heat loss |
| C. | Make it look attractive |
| D. | None of these |
| Answer» C. Make it look attractive | |
| 442. |
_ Calorific value of of blast furnace gas is around __________ KCal/Nm³.$? |
| A. | 850 |
| B. | 1800 |
| C. | 4200 |
| D. | 6500 |
| Answer» B. 1800 | |
| 443. |
_ The combustion reaction, C + O‚ÇÇ = CO‚ÇÇ, is$? |
| A. | Exothermic |
| B. | Endothermic |
| C. | Autocatalytic |
| D. | None of these |
| Answer» B. Endothermic | |
| 444. |
_ Bulk density of pulverised coal may be about __________ kg/m³.$? |
| A. | 100 |
| B. | 500 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 445. |
_ Out of the following fuels, the difference between gross and net calorific value will be minimum in case of$? |
| A. | Coke oven gas |
| B. | Water gas |
| C. | Natural gas |
| D. | Blast furnace gas |
| Answer» E. | |
| 446. |
_ Which of the following is called "blue gas"?$? |
| A. | Coke oven gas |
| B. | Water gas |
| C. | Natural gas |
| D. | Producer gas |
| Answer» C. Natural gas | |
| 447. |
_ Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.$? |
| A. | <120 |
| B. | >120 |
| C. | <90 |
| D. | 90-110 |
| Answer» C. <90 | |
| 448. |
_ Coal tar fuel - 200 (CTF 200) is a mixture of$? |
| A. | Pitch and creosote oil |
| B. | Light oil and pitch |
| C. | Anthracene and crecosote oil |
| D. | Solar oil and pitch |
| Answer» B. Light oil and pitch | |
| 449. |
_ Which of the following is not used as a binder in coal briquetting?$? |
| A. | Tar |
| B. | Molasses |
| C. | Pitch |
| D. | Line |
| Answer» E. | |
| 450. |
_ Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.$? |
| A. | Colour |
| B. | Moisture content |
| C. | Ash content |
| D. | Volatile matter |
| Answer» E. | |