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.
| 151. |
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ? |
| A. | Multicyclones |
| B. | Bag filter |
| C. | Wet scrubber |
| D. | Hydrocyclones |
| Answer» C. Wet scrubber | |
| 152. |
Pick out the wrong statement.: |
| A. | Carburetted water gas is also called blue gas |
| B. | Coals are divided in four species according to their carbon content in Seylor's classification |
| C. | Carbonisation time in a by-product coke oven is about 16 hours |
| D. | Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons |
| Answer» B. Coals are divided in four species according to their carbon content in Seylor's classification | |
| 153. |
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 | |
| 154. |
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that |
| A. | 21% excess air has been used for combustion |
| B. | 21% excess oxygen has been used for combustion |
| C. | Complete combustion of fuel has taken place |
| D. | No excess air has been used for combustion |
| Answer» D. No excess air has been used for combustion | |
| 155. |
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C. |
| A. | Sensible |
| B. | Latent |
| C. | Sensible and latent |
| D. | None of these |
| Answer» D. None of these | |
| 156. |
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be |
| A. | 21 |
| B. | 77 |
| C. | 79 |
| D. | 29 |
| Answer» B. 77 | |
| 157. |
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 | |
| 158. |
The gasification reaction represented by, C + H₂O = CO + H₂, is |
| A. | Exothermic |
| B. | Endothermic |
| C. | Catalytic |
| D. | Autocatalytic |
| Answer» C. Catalytic | |
| 159. |
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³. |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 1 |
| Answer» B. 4 | |
| 160. |
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C. |
| A. | 100 to 150 |
| B. | 350 to 450 |
| C. | 550 to 650 |
| D. | 700 to 850 |
| Answer» C. 550 to 650 | |
| 161. |
Which of the following is the maximum coal producing state in India? |
| A. | Orissa |
| B. | West Bengal |
| C. | Jharkhand |
| D. | Assam |
| Answer» D. Assam | |
| 162. |
Volumetric ratio of N₂ to O₂ in dry atmospheric air is |
| A. | 0.21 |
| B. | 3.76 |
| C. | 4.76 |
| D. | 0.79 |
| Answer» C. 4.76 | |
| 163. |
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. | |
| 164. |
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis. |
| A. | 550 |
| B. | 750 |
| C. | 950 |
| D. | 1150 |
| Answer» D. 1150 | |
| 165. |
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ? |
| A. | Blast furnace gas |
| B. | Natural gas |
| C. | Producer gas |
| D. | Water gas |
| Answer» C. Producer gas | |
| 166. |
Which of the following is a primary fuel? |
| A. | Blast furnace coke |
| B. | Gasoline |
| C. | Natural gas |
| D. | Wood charcoal |
| Answer» D. Wood charcoal | |
| 167. |
The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be |
| A. | Y |
| B. | 0.95 y |
| C. | 1.05 y |
| D. | 1.8 y |
| Answer» B. 0.95 y | |
| 168. |
Which of the following oil gasification processes is non-catalytic? |
| A. | Semet-Solvay process |
| B. | Segas process |
| C. | Onia-Gegi process |
| D. | Steam reforming of naphtha |
| Answer» B. Segas process | |
| 169. |
Which of the following accentuates clinker-ing trouble on furnace grate burning coal? |
| A. | Low reactivity of carbonised residue containing high proportions of iron & sulphur |
| B. | Low forced draught and fuel bed temperature |
| C. | Thick fire bed and preheated primary air |
| D. | All of the above |
| Answer» E. | |
| 170. |
Which adsorbant is used for removing sulphur compounds (S Q, H₂S, 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. | |
| 171. |
With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | Either A or B, depends on other factors |
| Answer» B. Decreases | |
| 172. |
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³. |
| A. | 30 |
| B. | 300 |
| C. | 3000 |
| D. | 30, 000 |
| Answer» C. 3000 | |
| 173. |
Bulk density of pulverised coal may be about __________ kg/m³. |
| A. | 100 |
| B. | 500 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 174. |
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 | |
| 175. |
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 | |
| 176. |
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 | |
| 177. |
Main constituent of natural gas is |
| A. | CH₄ (upto 90%) |
| B. | C₂H₆ |
| C. | C₃H₈ |
| D. | H₂ |
| Answer» B. C₂H₆ | |
| 178. |
Calorific value of of blast furnace gas is around __________ KCal/Nm³. |
| A. | 850 |
| B. | 1800 |
| C. | 4200 |
| D. | 6500 |
| Answer» B. 1800 | |
| 179. |
Calorific value of coke oven gas is around __________ Kcal/Nm³. |
| A. | 900 |
| B. | 4200 |
| C. | 7500 |
| D. | 2000 |
| Answer» C. 7500 | |
| 180. |
The calorific value of L.D. converter gas is about __________ Kcal/Nm³ . |
| A. | 1800 |
| B. | 800 |
| C. | 4500 |
| D. | 10000 |
| Answer» B. 800 | |
| 181. |
Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ? |
| A. | Blast furnace coke |
| B. | Low temperature coke |
| C. | Anthracite coal |
| D. | Sub-bituminous coal |
| Answer» C. Anthracite coal | |
| 182. |
Which of the following accounts for maximum energy loss in a boiler? |
| A. | Flue gases |
| B. | Ash content in the fuel |
| C. | Incomplete combustion |
| D. | Unburnt carbon in flue gases |
| Answer» B. Ash content in the fuel | |
| 183. |
Which is the most matured coal? |
| A. | Lignite |
| B. | Bituminous |
| C. | Semi-anthracite |
| D. | Anthracite |
| Answer» E. | |
| 184. |
Overfire burning in a furnace is a phenomenon characterised by the |
| A. | Supply of excess fuel |
| B. | Supply of excess air |
| C. | Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air |
| D. | None of these |
| Answer» D. None of these | |
| 185. |
Which of the following is coking? |
| A. | Vitrain |
| B. | Fussain |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» B. Fussain | |
| 186. |
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 | |
| 187. |
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 | |
| 188. |
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 | |
| 189. |
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 | |
| 190. |
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)? |
| A. | Producer gas |
| B. | Carburetted water gas |
| C. | Natural gas |
| D. | Liquified petroleum gas |
| Answer» E. | |
| 191. |
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 | |
| 192. |
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C. |
| A. | 400-500 |
| B. | 900-1000 |
| C. | 1400-1500 |
| D. | 1700-1800 |
| Answer» C. 1400-1500 | |
| 193. |
Which of the following is not a binder for coal briquetting? |
| A. | Coal tar |
| B. | Bitumen |
| C. | Molasses |
| D. | None of these |
| Answer» E. | |
| 194. |
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 | |
| 195. |
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 | |
| 196. |
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 | |
| 197. |
When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal. |
| A. | Carbonisation |
| B. | Oxidation |
| C. | Coalification |
| D. | Gasification |
| Answer» E. | |
| 198. |
Ammonia content in raw coke oven gas is about __________ gm/Nm³. |
| A. | 1 |
| B. | 15 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 199. |
The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction. n. |
| A. | Neumann reversal |
| B. | Shift conversion |
| C. | Boudouard |
| D. | Reduction |
| Answer» D. Reduction | |
| 200. |
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. | |