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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.
| 751. |
Spontaneous combustion of coal on storage results due to |
| A. | inadequate ventilation. |
| B. | low temperature oxidation. |
| C. | storage in large heaps with small surface to volume ratio. |
| D. | all (a), (b)and (c). |
| Answer» E. | |
| 752. |
Insitu theory and drift theory are related to the |
| A. | origin of petroleum oil. |
| B. | origin of coal. |
| C. | coalification. |
| D. | variation of coal quality with depth. |
| Answer» C. coalification. | |
| 753. |
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal. |
| A. | hydrogenation |
| B. | gasification |
| C. | carbonisation |
| D. | none of these |
| Answer» B. gasification | |
| 754. |
Naphthalene recovered from coke oven gas is used |
| A. | as moisture proof coating on fibres. |
| B. | as moth balls (insecticides). |
| C. | as a fuel in furnaces. |
| D. | for making electrodes. |
| Answer» C. as a fuel in furnaces. | |
| 755. |
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its |
| A. | emissivity factor is higher. |
| B. | sulphur content is lower. |
| C. | flue gas has lower dew point thereby facilitating more waste heat recovery. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 756. |
Coking coals are invariably |
| A. | lignites |
| B. | bituminous coals |
| C. | semi-anthracites |
| D. | anthracites |
| Answer» C. semi-anthracites | |
| 757. |
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain |
| A. | CO |
| B. | CO2 |
| C. | H2O |
| D. | both(b) & (c) |
| Answer» E. | |
| 758. |
Washing of coal decreases its |
| A. | caking index. |
| B. | mineral matter content. |
| C. | ash content. |
| D. | both (b) and (c). |
| Answer» C. ash content. | |
| 759. |
The calorific value is the highest out of the following for |
| A. | producer gas |
| B. | water gas |
| C. | coke oven gas |
| D. | blast furnace gas |
| Answer» D. blast furnace gas | |
| 760. |
Oxygen percentage (by weight) in atmospheric air is |
| A. | 19 |
| B. | 21 |
| C. | 23 |
| D. | 29 |
| Answer» D. 29 | |
| 761. |
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. | |
| 762. |
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 | |
| 763. |
__________ of the coal is the basis for Seylor's coal classification. |
| A. | Proximate analysis |
| B. | Ultimate analysis |
| C. | Caking index |
| D. | Calorific value |
| Answer» C. Caking index | |
| 764. |
Steam is intermittently admitted into the fuel bed during the production of producer gas to |
| A. | convert CO to CO2. |
| B. | increase the combustion rate. |
| C. | increase the gas production rate. |
| D. | minimise the chances of clinker formation. |
| Answer» E. | |
| 765. |
Main constituents of benzol are |
| A. | benzene, toluene & xylene. |
| B. | tar & creosote. |
| C. | ammonia & phenol. |
| D. | anthracene & phenol. |
| Answer» B. tar & creosote. | |
| 766. |
C.V. (kcal/Nm3) of gaseous fuels __________ with increase in molecular weight. |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | may increase or decrease, depends on combustibles. |
| Answer» E. | |
| 767. |
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 | |
| 768. |
Which of the following is the most poisonous gas ? |
| A. | Coke oven gas |
| B. | Producer gas |
| C. | Blast furnace gas |
| D. | L.D. converter gas |
| Answer» E. | |
| 769. |
Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.$ |
| A. | 80-170 |
| B. | 200-300 |
| C. | 250-270 |
| D. | 280-300 |
| Answer» B. 200-300 | |
| 770. |
Which of the following is the maximum coal producing state in India ? |
| A. | Orissa |
| B. | West Bengal |
| C. | Jharkhand |
| D. | Assam |
| Answer» D. Assam | |
| 771. |
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. | |
| 772. |
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. | |
| 773. |
A good coking coal should have high __________ content. |
| A. | ash |
| B. | sulphur & phosphorus |
| C. | moisture |
| D. | none of these |
| Answer» E. | |
| 774. |
'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 | |
| 775. |
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. | |
| 776. |
Which is the most matured coal ? |
| A. | Lignite |
| B. | Bituminous |
| C. | Semi-anthracite |
| D. | Anthracite |
| Answer» E. | |
| 777. |
Which of the following has the highest gross calorific value ? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Carburetted water gas |
| D. | Oil refinery gas |
| Answer» E. | |
| 778. |
Which of the following is a measure of the agglutinating (i.e., binding) property of coal? |
| A. | Thickness of plastic layer |
| B. | Caking index |
| C. | Swelling index |
| D. | Gray-king index |
| Answer» C. Swelling index | |
| 779. |
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of |
| A. | less air for combustion. |
| B. | correct amount of air for combustion. |
| C. | too much air for combustion. |
| D. | pulverised coal in boilers. |
| Answer» D. pulverised coal in boilers. | |
| 780. |
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. | |
| 781. |
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) and (b). |
| D. | neither (a) nor (b). |
| Answer» E. | |
| 782. |
A gaseous fuel in order to develop luminousity on burning, must contain |
| A. | carbon monoxide |
| B. | hydrocarbons |
| C. | hydrogen |
| D. | oxygen |
| Answer» C. hydrogen | |
| 783. |
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. | |
| 784. |
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. | |
| 785. |
Main use of soft coke is as __________ fuel. |
| A. | domestic |
| B. | blastfurnace |
| C. | foundary |
| D. | none of these |
| Answer» B. blastfurnace | |
| 786. |
KOH solution used in orsat apparatus absorbs |
| A. | CO2 |
| B. | SO2 |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 787. |
Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ? |
| A. | Coal |
| B. | Kerosene |
| C. | Natural gas |
| D. | Furnace oil |
| Answer» E. | |
| 788. |
Which of the following combustibles is absent in blast furnace gas ? |
| A. | H2 |
| B. | CH4 |
| C. | CO |
| D. | none of these |
| Answer» C. CO | |
| 789. |
Short/intense flame is produced during combustion of gaseous fuel by using |
| A. | high amount/current of combustion air. |
| B. | low amount/current of combustion air. |
| C. | preheated secondary air. |
| D. | very little excess air. |
| Answer» B. low amount/current of combustion air. | |
| 790. |
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 | |
| 791. |
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher |
| A. | calorific value |
| B. | higher C/H ratio |
| C. | sulphur content |
| D. | difference in gross & net calorific value |
| Answer» C. sulphur content | |
| 792. |
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. | |
| 793. |
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. | |
| 794. |
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 (a), (b) and (c) |
| Answer» B. in a metallurgical furnace does not contaminate the product in the furnace by ash from fuel. | |
| 795. |
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of |
| A. | MgO & Na2CO3 |
| B. | MgSO4 & BaCl2 |
| C. | BaSO4 & NaCl |
| D. | MgCO3 & NaCl |
| Answer» B. MgSO4 & BaCl2 | |
| 796. |
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. | |
| 797. |
Which of the following constituents of a fuel does not contribute to its calorific value on combustion ? |
| A. | Hydrogen |
| B. | Sulphur |
| C. | Carbon |
| D. | None of these |
| Answer» E. | |
| 798. |
Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm. |
| A. | 43588 |
| B. | 25-30 |
| C. | 60-65 |
| D. | 95-100 |
| Answer» C. 60-65 | |
| 799. |
Gross calorific value will be equal to the net calorific value for |
| A. | H2 |
| B. | C2H2 |
| C. | CO |
| D. | C2H6 |
| Answer» D. C2H6 | |
| 800. |
Percentage of hydrogen in coke oven gas may be around |
| A. | 10 |
| B. | 25 |
| C. | 45 |
| D. | 60 |
| Answer» E. | |