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.
| 551. |
Naphthalene is removed from coke oven gas by$? |
| A. | Scrubbing with wash oil (a petroleum product) |
| B. | Adsorbing on bog iron bed |
| C. | Absorbing in vetro-coke solution |
| D. | None of these |
| Answer» B. Adsorbing on bog iron bed | |
| 552. |
Benzol is used$? |
| A. | As a motor fuel blend |
| B. | For producing benzene, tolune & xylene by its distillation |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 553. |
Which of the following fuels has the highest calorific value per unit mass (kcal/kg)?$? |
| A. | Coal |
| B. | Kerosene |
| C. | Natural gas |
| D. | Furnace oil |
| Answer» E. | |
| 554. |
Grindability index of a coal is 100. It implies that the$? |
| A. | Coal can be pulverised with great difficulty |
| B. | Coal can't be pulverised |
| C. | Coal can be easily pulverised |
| D. | Power consumption in grinding the coal will be very high |
| Answer» D. Power consumption in grinding the coal will be very high | |
| 555. |
The main advantage of forced draft over natural draft is that$? |
| A. | Combustion of fuel is complete |
| B. | Smaller height chimney can be used |
| C. | Furnace control is easier |
| D. | All of the above |
| Answer» E. | |
| 556. |
Fuel for a nuclear reactor (thermal) is$? |
| A. | Uranium |
| B. | Plutonium |
| C. | Radium |
| D. | None of these |
| Answer» B. Plutonium | |
| 557. |
Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.$? |
| A. | 1000 |
| B. | 4000 |
| C. | 8000 |
| D. | 15000 |
| Answer» D. 15000 | |
| 558. |
A sample of natural gas containing 80% methane (CH‚ÇÑ) and rest nitrogen (N‚ÇÇ) is burnt with 20% excess air. With 80% of the combustibles producing CO‚ÇÇ and the reminder going to CO, the Orsat analysis in volume percent is$? |
| A. | CO‚ÇÇ : 6.26, CO : 1.56, O‚ÇÇ : 3.91, H‚ÇÇO :15.66, N‚ÇÇ : 72.60 |
| B. | CO‚ÇÇ : 7.42, CO : 1.86, O‚ÇÇ : 4.64, N‚ÇÇ:86.02 |
| C. | CO‚ÇÇ : 6.39, CO : 1.60, O‚ÇÇ : 3.99, H‚ÇÇO:25.96, N‚ÇÇ:72.06 |
| D. | CO‚ÇÇ : 7.60, CO : 1.90, O‚ÇÇ : 4.75, N‚ÇÇ : 85.74 |
| Answer» C. CO‚Äö√á√á : 6.39, CO : 1.60, O‚Äö√á√á : 3.99, H‚Äö√á√áO:25.96, N‚Äö√á√á:72.06 | |
| 559. |
Fuel consumption in coke making can be reduced by$? |
| A. | Preheating, blending and de-ashing the coal |
| B. | Stamped charging of coal |
| C. | Dry quenching of coke |
| D. | All of the above |
| Answer» E. | |
| 560. |
Abrasion index of blast furnace coke should be around __________ percent.$? |
| A. | 20 |
| B. | 35 |
| C. | 55 |
| D. | 80 |
| Answer» E. | |
| 561. |
Which of the following is a primary fuel?$? |
| A. | Blast furnace coke |
| B. | Gasoline |
| C. | Natural gas |
| D. | Wood charcoal |
| Answer» D. Wood charcoal | |
| 562. |
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called$? |
| A. | Back draughting |
| B. | Banking |
| C. | Under pressurising |
| D. | None of these |
| Answer» C. Under pressurising | |
| 563. |
Too much of excess air in combustion results in high$? |
| A. | Fuel consumption for the same heat load |
| B. | Stack gas temperature |
| C. | Percentage of oxygen in flue gases |
| D. | All of the above |
| Answer» E. | |
| 564. |
Coke oven gas is stripped of its H‚ÇÇS and mercaptans content by$? |
| A. | Absorption in wash oil |
| B. | Adsorption on bog iron bed |
| C. | Bubbling it through dilute sulphuric acid |
| D. | Adsorption on silica gel |
| Answer» C. Bubbling it through dilute sulphuric acid | |
| 565. |
Supply of excess air for complete combustion of fuel is necessitated to facilitate$? |
| A. | Its thorough mixing with air |
| B. | Attainment of chemical equilibrium |
| C. | Attainment of high temperature |
| D. | None of these |
| Answer» B. Attainment of chemical equilibrium | |
| 566. |
Calorific value of wood gas is about __________ kcal/Nm³.$? |
| A. | 1500 |
| B. | 3300 |
| C. | 5400 |
| D. | 8500 |
| Answer» C. 5400 | |
| 567. |
Use of preheated air for combustion of fuel in the furnace, increases the$? |
| A. | Scale losses of the furnace stock |
| B. | Calorific value of the fuel |
| C. | Flame temperature |
| D. | None of these |
| Answer» D. None of these | |
| 568. |
Weathering of coal during storage causes$? |
| A. | Reduction in coal size |
| B. | Increase in its friability |
| C. | Decrease in its caking capacity |
| D. | All of the above |
| Answer» E. | |
| 569. |
Anthracite coal$? |
| A. | Contains more volatile matter than bituminous coal |
| B. | Ignites more easily than bituminous coal |
| C. | Is essentially a coking coal |
| D. | Burns with short, bluish, yellow-tipped flame producing very little smoke |
| Answer» E. | |
| 570. |
Main constituents of purified Lurgi gas are$? |
| A. | H‚ÇÇ, CmHn & CO‚ÇÇ |
| B. | CO, H‚ÇÇ & CH‚ÇÑ |
| C. | CO‚ÇÇ, O‚ÇÇ & CO |
| D. | N‚ÇÇ, H‚ÇÇ & CO‚ÇÇ |
| Answer» C. CO‚Äö√á√á, O‚Äö√á√á & CO | |
| 571. |
Adiabatic flame temperature of a fuel is dependent on the initial temperature of$? |
| A. | Fuel |
| B. | Air |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 572. |
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.$? |
| A. | 1kg mole |
| B. | 22.4 Nm³ |
| C. | 32 kg |
| D. | All of the above |
| Answer» E. | |
| 573. |
Which of the following is not a by-product fuel?$? |
| A. | Sewage gas |
| B. | Refinery gas |
| C. | Producer gas |
| D. | Bagasse |
| Answer» D. Bagasse | |
| 574. |
Percentage of methane in coke oven gas may be around$? |
| A. | 5 |
| B. | 15 |
| C. | 25 |
| D. | 50 |
| Answer» D. 50 | |
| 575. |
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.$? |
| A. | Bomb |
| B. | Boy's |
| C. | Junkar's |
| D. | None of these |
| Answer» B. Boy's | |
| 576. |
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the$? |
| A. | Gas yield is less |
| B. | Tar yield is more |
| C. | Ignition temperature of coke produced is less |
| D. | Aromatic content of tar produced is more |
| Answer» E. | |
| 577. |
Stack (chimney) height in a big thermal power plant is dictated by the$? |
| A. | Pollution control aspect |
| B. | Draught to be created |
| C. | Limitation of constructional facilities |
| D. | None of these |
| Answer» C. Limitation of constructional facilities | |
| 578. |
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.$? |
| A. | 5 |
| B. | 25 |
| C. | 55 |
| D. | 75 |
| Answer» C. 55 | |
| 579. |
Presence of force moisture in coal is most disadvantageous during its$? |
| A. | Transportation and handling |
| B. | Washing |
| C. | Pulverisation |
| D. | Storage |
| Answer» D. Storage | |
| 580. |
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about$? |
| A. | 8800 kcal/m³ |
| B. | 8800 kcal/kg |
| C. | Same as that of coal middling |
| D. | 25000 kcal/kg |
| Answer» C. Same as that of coal middling | |
| 581. |
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always$? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | Unpredictable |
| Answer» D. Unpredictable | |
| 582. |
The maximum adiabatic flame temperature is attained, when the fuel is burnt with$? |
| A. | Theoretically required amount of air |
| B. | More than theoretically required amount of air |
| C. | Less than theoretically required amount of air |
| D. | Theoretically required amount of oxygen |
| Answer» E. | |
| 583. |
Which of the following fuel gases is heavier than air?$? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Natural gas |
| D. | Water gas |
| Answer» B. Coke oven gas | |
| 584. |
The gas which contributes maximum to the heating value of natural gas is$? |
| A. | CO |
| B. | CO‚ÇÇ |
| C. | H‚ÇÇ |
| D. | CH‚ÇÑ |
| Answer» E. | |
| 585. |
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.$? |
| A. | 70 |
| B. | 85 |
| C. | 105 |
| D. | 145 |
| Answer» D. 145 | |
| 586. |
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.$? |
| A. | 30 |
| B. | 65 |
| C. | 120 |
| D. | 180 |
| Answer» C. 120 | |
| 587. |
Which of the following is unsuitable fuel for producer gas manufacture?$? |
| A. | Coke |
| B. | Anthracite |
| C. | Coal having low fusion point of its ash |
| D. | Coal having high fusion point of its ash |
| Answer» D. Coal having high fusion point of its ash | |
| 588. |
Fussain$? |
| A. | Is friable, charcoal like substance |
| B. | Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal |
| C. | Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation |
| D. | All of the above |
| Answer» E. | |
| 589. |
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.$? |
| A. | Hydrogen |
| B. | Methane |
| C. | Unsaturated hydrocarbons |
| D. | All of the above |
| Answer» B. Methane | |
| 590. |
Which of the following is coking?$? |
| A. | Vitrain |
| B. | Fussain |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» B. Fussain | |
| 591. |
Traces of tar fog present in the coke oven gas is removed by$? |
| A. | Cyclone separator |
| B. | Wet packed scrubber |
| C. | Electrostatic precipitator |
| D. | Washing with monoethanolamine |
| Answer» D. Washing with monoethanolamine | |
| 592. |
The main function of primary air in pulverised coal fired burner is to$? |
| A. | Burn CO to CO‚ÇÇ |
| B. | Dry and transport the coal |
| C. | Have proper combustion by supplying it around the burner |
| D. | Preheat the tertiary air used for complete combustion of CO to CO‚ÇÇ |
| Answer» C. Have proper combustion by supplying it around the burner | |
| 593. |
Which of the following is a rich fuel gas?$? |
| A. | Producer gas |
| B. | Coal gas from underground gasification of coal |
| C. | Refinery gases |
| D. | None of these |
| Answer» D. None of these | |
| 594. |
Coke ovens in steel plant are heated by$? |
| A. | Electricity |
| B. | Coke oven gas |
| C. | Mixed gas |
| D. | Both B & C |
| Answer» E. | |
| 595. |
Which of the following would require least amount of secondary air for combustion?$? |
| A. | Coke breeze containing 25% ash and 2% volatile matter |
| B. | Anthracite containing 10% volatile matter and 8% ash |
| C. | Bituminous coal containing 20% ash and 25% volatile matter |
| D. | Semi-bituminous coal containing 25% ash and 20% volatile matter |
| Answer» B. Anthracite containing 10% volatile matter and 8% ash | |
| 596. |
Soft coke is not$? |
| A. | Produced by low temperature carbonisation of coal |
| B. | A domestic fuel |
| C. | Used in blast furnaces |
| D. | None of these |
| Answer» D. None of these | |
| 597. |
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in$? |
| A. | KOH |
| B. | Ammoniacal cuprous chloride |
| C. | Pyrogallol solution |
| D. | None of these |
| Answer» E. | |
| 598. |
Ultimate analysis of coal determines its __________ content.$? |
| A. | Carbon, hydrogen, nitrogen & sulphur |
| B. | Carbon, ash, sulphur & nitrogen |
| C. | Carbon, sulphur, volatile matter & ash |
| D. | Carbon, volatile matter, ash & moisture |
| Answer» B. Carbon, ash, sulphur & nitrogen | |
| 599. |
Purity of coke means that, it is high in carbon and low in$? |
| A. | Volatiles |
| B. | Ash |
| C. | Iron |
| D. | Moisture |
| Answer» B. Ash | |
| 600. |
A fuel with high heat release rate will$? |
| 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 | |