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.
| 651. |
Removal of hydrogen from coke oven gas? |
| A. | Increases its calorific value |
| B. | Decreases its calorific value |
| C. | Does not alter its calorific value |
| D. | Is not possible on commerical scale |
| Answer» B. Decreases its calorific value | |
| 652. |
The maximum percentage of CO‚ÇÇ in a flue gas (from a carbonaceous fuel) can be? |
| A. | 21 |
| B. | 77 |
| C. | 79 |
| D. | 29 |
| Answer» B. 77 | |
| 653. |
Which is the heaviest fuel gas out of the following?? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Water gas |
| D. | Carburetted water gas |
| Answer» B. Coke oven gas | |
| 654. |
Softening temperature of coal ash is a measure of the __________ of coal.? |
| A. | Caking tendency |
| B. | Coking tendency |
| C. | Clinkering tendency |
| D. | Size stability |
| Answer» D. Size stability | |
| 655. |
Presence of nitrogen in combustion air does not reduce the? |
| A. | Amount of heat liberated |
| B. | Flame temperature |
| C. | Flue gas temperature |
| D. | Any of the above |
| Answer» B. Flame temperature | |
| 656. |
Washing of coal? |
| A. | Reduces its sulphur and ash content |
| B. | Controls its ash fusibility and increases its calorific value |
| C. | Improves its coking properties |
| D. | All of the above |
| Answer» E. | |
| 657. |
Gross calorific value will be equal to the net calorific value for? |
| A. | H‚ÇÇ |
| B. | C‚ÇÇH‚ÇÇ |
| C. | CO |
| D. | C‚ÇÇH‚ÇÜ |
| Answer» D. C‚Äö√á√áH‚Äö√á√ú | |
| 658. |
About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.$ |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 1 |
| Answer» D. 1 | |
| 659. |
The average molecular weight of a flue gas having the composition by volume as CO‚ÇÇ = 25%, O‚ÇÇ = 25%, N‚ÇÇ = 50% will be$ |
| A. | 27.6 |
| B. | 23 |
| C. | 47.3 |
| D. | 42.9 |
| Answer» C. 47.3 | |
| 660. |
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.$ |
| A. | 60 |
| B. | 160 |
| C. | 500 |
| D. | 750 |
| Answer» C. 500 | |
| 661. |
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).$ |
| A. | 150 |
| B. | 1500 |
| C. | 3500 |
| D. | 5000 |
| Answer» C. 3500 | |
| 662. |
Low temperature carbonisation of coal takes place at __________ °C.$ |
| A. | 300 |
| B. | 1100 |
| C. | 700 |
| D. | 150 |
| Answer» D. 150 | |
| 663. |
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. | |
| 664. |
Which of the following would require maximum amount of % excess air for complete combustion? |
| A. | Coke oven gas |
| B. | Furnace oil |
| C. | Pulverised coal |
| D. | Lump coal (fixed on chain grate) |
| Answer» E. | |
| 665. |
The calorific value of natural gas is about __________ kcal/Nm³.$ |
| A. | 10, 000 |
| B. | 2500 |
| C. | 25, 000 |
| D. | 35, 000 |
| Answer» B. 2500 | |
| 666. |
Micum Index of a coke is a measure of its |
| A. | Reactivity |
| B. | Porosity |
| C. | Bulk density |
| D. | Hardness & strength |
| Answer» E. | |
| 667. |
Which adsorbant is used for removing sulphur compounds (S Q, H‚ÇÇS, RSH etc.) removal from coke oven gas in by-products recovery plant ?$ |
| A. | Silica gel |
| B. | Diatomaceous earth |
| C. | Basalt |
| D. | Bog iron (i.e., moist ferric hydroxide) |
| Answer» E. | |
| 668. |
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 | |
| 669. |
One kg of carbon for theoretically complete combustion requires __________ kg of air. |
| A. | 11.5 |
| B. | 0.5 |
| C. | 23 |
| D. | 12 |
| Answer» B. 0.5 | |
| 670. |
As the C/H ratio of the fuel increases, the amount of CO‚ÇÇ formed on combustion __________ for the same percentage of excess air.$ |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | May increase or decrease depending on the type of fuel |
| Answer» C. Remains same | |
| 671. |
Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?$ |
| A. | Carburetted water gas |
| B. | Blast furnace gas |
| C. | Natural gas |
| D. | Producers |
| Answer» D. Producers | |
| 672. |
Which of the following is a lean fuel gas? |
| A. | Coke oven gas |
| B. | LPG |
| C. | Blast furnace gas |
| D. | Natural gas |
| Answer» D. Natural gas | |
| 673. |
Volumetric ratio of N‚ÇÇ to O‚ÇÇ in dry atmospheric air is# |
| A. | 0.21 |
| B. | 3.76 |
| C. | 4.76 |
| D. | 0.79 |
| Answer» C. 4.76 | |
| 674. |
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.# |
| A. | 500 |
| B. | 750 |
| C. | 950 |
| D. | 1100 |
| Answer» C. 950 | |
| 675. |
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.# |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 35 |
| Answer» D. 35 | |
| 676. |
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. | |
| 677. |
Which of the following is not a 'manufactured' fuel? |
| A. | LPG |
| B. | Coal briquettes |
| C. | Tar |
| D. | Colloidal fuels |
| Answer» D. Colloidal fuels | |
| 678. |
The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .# |
| A. | 1800 |
| B. | 800 |
| C. | 4500 |
| D. | 10000 |
| Answer» B. 800 | |
| 679. |
Which of the following can be made into briquettes without the use of a binder? |
| A. | Lignite |
| B. | Bituminous coal |
| C. | Anthracite coal |
| D. | None of these |
| Answer» B. Bituminous coal | |
| 680. |
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.# |
| A. | 15-30 |
| B. | 1-2 |
| C. | 70-100 |
| D. | 150-200 |
| Answer» B. 1-2 | |
| 681. |
Which of the following combustibles is absent in blast furnace gas? |
| A. | H‚ÇÇ |
| B. | CH‚ÇÑ |
| C. | CO |
| D. | None of these |
| Answer» C. CO | |
| 682. |
Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.# |
| A. | 2.4 |
| B. | 1.75 |
| C. | 0.87 |
| D. | 11.4 |
| Answer» B. 1.75 | |
| 683. |
The calorific value of producer gas is around __________ kcal/Nm³# |
| A. | 1300 |
| B. | 500 |
| C. | 4500 |
| D. | 9000 |
| Answer» B. 500 | |
| 684. |
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if |
| A. | it contains large amount of volatile matter. |
| B. | it is stored in tall heaps. |
| C. | smaller fines are stored in large quantity. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 685. |
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 | |
| 686. |
High sulphur (4-6%) coal in India are found in |
| A. | Assam |
| B. | Andhra Pradesh |
| C. | Bengal |
| D. | Madhya Pradesh |
| Answer» B. Andhra Pradesh | |
| 687. |
In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing |
| A. | CO |
| B. | CO2 |
| C. | O2 |
| D. | H2O |
| Answer» B. CO2 | |
| 688. |
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. | |
| 689. |
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. | |
| 690. |
Producer gas comprises mainly of |
| A. | CO & N2 |
| B. | CO & H2 |
| C. | CO2 & N2 |
| D. | CO2 & H2 |
| Answer» B. CO & H2 | |
| 691. |
Cannel coal |
| A. | is non-coking. |
| B. | has a high volatile matter content and burns with a luminous smoky flame. |
| C. | is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 692. |
The weathering index of a coal |
| A. | gives an idea of the fusion temperature of ash. |
| B. | is related to its calorific value. |
| C. | is a measure of its size stability, when stored & exposed to weather. |
| D. | is a measure of its caking tendency. |
| Answer» D. is a measure of its caking tendency. | |
| 693. |
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass. |
| A. | density |
| B. | porosity |
| C. | electrical resistivity |
| D. | none of these |
| Answer» B. porosity | |
| 694. |
Ammonia content in raw coke oven gas is about __________ gm/Nm3. |
| A. | 1 |
| B. | 15 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 695. |
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 (a), (b) and (c) |
| Answer» B. methane | |
| 696. |
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. | |
| 697. |
The main drawback of supplying more excess air in the combustion of fuel is the |
| A. | excessive power requirement of air blower. |
| B. | enhanced sensible heat loss in the flue gas. |
| C. | intermittant and uncontrolled combustion of the fuel. |
| D. | high exit flue gas temperature from the furnace. |
| Answer» C. intermittant and uncontrolled combustion of the fuel. | |
| 698. |
Highly reactive coke have lower |
| A. | porosity. |
| B. | coke reactivity index (CRI). |
| C. | Critical air blast (CAB) value. |
| D. | both (b) and (c). |
| Answer» D. both (b) and (c). | |
| 699. |
With increase in moisture content of coal, its |
| A. | calorific value increases. |
| B. | caking properties diminish. |
| C. | swelling during carbonisation becomes excessive. |
| D. | none of these. |
| Answer» C. swelling during carbonisation becomes excessive. | |
| 700. |
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 | |