MCQOPTIONS
Saved Bookmarks
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.
| 201. |
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 | |
| 202. |
Fuel for a nuclear reactor (thermal) is |
| A. | Uranium |
| B. | Plutonium |
| C. | Radium |
| D. | None of these |
| Answer» B. Plutonium | |
| 203. |
Which of the following is not used as a binder in coal briquetting? |
| A. | Tar |
| B. | Molasses |
| C. | Pitch |
| D. | Line |
| Answer» E. | |
| 204. |
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be |
| A. | 27.6 |
| B. | 23 |
| C. | 47.3 |
| D. | 42.9 |
| Answer» C. 47.3 | |
| 205. |
Yield of blast furnace gas is about __________ Nm³ /ton of pig iron. |
| A. | 300 |
| B. | 2000 |
| C. | 5000 |
| D. | 10000 |
| Answer» C. 5000 | |
| 206. |
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 | |
| 207. |
Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³. |
| A. | 1800 |
| B. | 3200 |
| C. | 5400 |
| D. | 10200 |
| Answer» D. 10200 | |
| 208. |
A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is |
| A. | CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O :15.66, N₂ : 72.60 |
| B. | CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02 |
| C. | CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06 |
| D. | CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74 |
| Answer» C. CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06 | |
| 209. |
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 | |
| 210. |
Abel apparatus is used for those oils, whose flash points are___°F. |
| A. | <120 |
| B. | >120 |
| C. | >280 |
| D. | 300-600 |
| Answer» B. >120 | |
| 211. |
Which of the following coke has the least percentage of ash? |
| A. | Petroleum coke |
| B. | Beehive coke |
| C. | Foundary coke |
| D. | Metallurgical coke |
| Answer» B. Beehive coke | |
| 212. |
Which of the following has the highest calorific value? |
| A. | Lignite |
| B. | Sub-bituminous coal |
| C. | Anthracite |
| D. | Peat |
| Answer» D. Peat | |
| 213. |
Low temperature carbonisation of coal takes place at __________ °C. |
| A. | 300 |
| B. | 1100 |
| C. | 700 |
| D. | 150 |
| Answer» D. 150 | |
| 214. |
Which of the following is not a product of tar distillation? |
| A. | Phenol & naphthalene |
| B. | Benzol & pitch |
| C. | Anthracene & creosote |
| D. | None of these |
| Answer» E. | |
| 215. |
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is |
| A. | 20 |
| B. | 12.5 |
| C. | 0 |
| D. | 10 |
| Answer» D. 10 | |
| 216. |
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 | |
| 217. |
The calorific value of producer gas is around __________ kcal/Nm³ |
| A. | 1300 |
| B. | 500 |
| C. | 4500 |
| D. | 9000 |
| Answer» B. 500 | |
| 218. |
The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm³. |
| A. | 5000 |
| B. | 25, 000 |
| C. | 10, 000 |
| D. | 15, 000 |
| Answer» C. 10, 000 | |
| 219. |
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³. |
| A. | 4000 |
| B. | 2500 |
| C. | 6500 |
| D. | 10000 |
| Answer» D. 10000 | |
| 220. |
Calorific value of wood gas is about __________ kcal/Nm³. |
| A. | 1500 |
| B. | 3300 |
| C. | 5400 |
| D. | 8500 |
| Answer» C. 5400 | |
| 221. |
The calorific value of natural gas is about __________ kcal/Nm³. |
| A. | 10, 000 |
| B. | 2500 |
| C. | 25, 000 |
| D. | 35, 000 |
| Answer» B. 2500 | |
| 222. |
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. | |
| 223. |
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker. |
| A. | 1100 |
| B. | 1250 |
| C. | 1350 |
| D. | 1400 |
| Answer» B. 1250 | |
| 224. |
The catalyst used in shift converter is%! |
| A. | Nickel |
| B. | Vanadium |
| C. | Silica gel |
| D. | Alumina |
| Answer» B. Vanadium | |
| 225. |
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.%! |
| A. | %of CO‚ÇÇ in |
| B. | % of O‚ÇÇin |
| C. | Temperature of |
| D. | Colour of |
| Answer» C. Temperature of | |
| 226. |
Gobar gas is produced by the __________ of cown dung.%! |
| A. | Fermentation |
| B. | Oxidation |
| C. | Hydrogenation |
| D. | None of these |
| Answer» B. Oxidation | |
| 227. |
Bright coal%! |
| A. | Contains more than 90% durain |
| B. | Contains more than 90% fussain |
| C. | Contains mainly vitrain & clarain and is generally coking |
| D. | Is non-coking |
| Answer» D. Is non-coking | |
| 228. |
Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the%! |
| A. | Decolourisation of sugar |
| B. | Solvent recovery from air and gases |
| C. | Absorption of gases and vapor |
| D. | Electrode manufacture |
| Answer» E. | |
| 229. |
Benzene is used%! |
| A. | As a motor fuel |
| B. | As an explosive |
| C. | For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR) |
| D. | As a perfume |
| Answer» D. As a perfume | |
| 230. |
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because%! |
| A. | The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot |
| B. | It reduces its calorific value tremendously |
| C. | It reduces its flame temperature tremendously |
| D. | There are chances of explosion during preheating |
| Answer» B. It reduces its calorific value tremendously | |
| 231. |
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 | |
| 232. |
In high temperature carbonisation (as compared to low temperature carbonisation) of coal%! |
| A. | Coke oven gas yield is more |
| B. | Tar yield is less but free carbon in tar is more |
| C. | Calorific value of coke oven gas is less |
| D. | All of the above |
| Answer» E. | |
| 233. |
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.%! |
| A. | Entrained |
| B. | Moving |
| C. | Fixed |
| D. | Fluidised |
| Answer» B. Moving | |
| 234. |
Steam is intermittently admitted into the fuel bed during the production of producer gas to%! |
| A. | Convert CO to CO‚ÇÇ |
| B. | Increase the combustion rate |
| C. | Increase the gas production rate |
| D. | Minimise the chances of clinker formation |
| Answer» E. | |
| 235. |
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 | |
| 236. |
Dry air required to burn 1 kg of carbon completely may be around __________ kg.%! |
| A. | 11 |
| B. | 2 |
| C. | 20 |
| D. | 38 |
| Answer» B. 2 | |
| 237. |
__________ present in coal is not determined in its ultimate analysis.%! |
| A. | Fixed carbon |
| B. | Total carbon |
| C. | Hydrogen |
| D. | Nitrogen |
| Answer» B. Total carbon | |
| 238. |
Efficient burning of anthracite coal requires%! |
| A. | Low preheat of air |
| B. | Fine grinding |
| C. | High excess air |
| D. | All of the above |
| Answer» C. High excess air | |
| 239. |
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 | |
| 240. |
With increase in calorific value of fuels, their adiabatic flame temperatures%! |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | May increase or decrease ; depends on the quantity of products of combustion |
| Answer» E. | |
| 241. |
Main use of hard coke produced by high temperature carbonisation is in the%! |
| A. | Iron blast furnace |
| B. | Cupola in foundaries |
| C. | Sinter making |
| D. | Domestic ovens |
| Answer» B. Cupola in foundaries | |
| 242. |
Which of the following is a poisonous fuel gas?%! |
| A. | Coke oven gas |
| B. | Blast furnace gas |
| C. | Natural gas |
| D. | None of these |
| Answer» C. Natural gas | |
| 243. |
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the%! |
| A. | Hot scarfing of steel slabs |
| B. | Mixing with blast furnace gas |
| C. | Coke oven battery heating |
| D. | Steel ladle drying |
| Answer» D. Steel ladle drying | |
| 244. |
Combustion of pulverised coal as compared to that of lump coal%! |
| A. | Develops a non-luminous flame |
| B. | Develops a low temperature flame |
| C. | Can be done with less excess air |
| D. | Provides a lower rate of heat release |
| Answer» D. Provides a lower rate of heat release | |
| 245. |
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 | |
| 246. |
The cuprous chloride used in orsat apparatus can absorb%! |
| A. | Only CO |
| B. | Both CO and CO‚ÇÇ |
| C. | Both CO and O‚ÇÇ |
| D. | All of the above |
| Answer» E. | |
| 247. |
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.%! |
| A. | 1000 |
| B. | 4000 |
| C. | 6000 |
| D. | 8000 |
| Answer» C. 6000 | |
| 248. |
Gray King Assay and Swelling Index of a coal is a measure of its%! |
| A. | Swelling characteristics |
| B. | Abradability |
| C. | Agglutinating properties |
| D. | Resistance to impact breakage |
| Answer» B. Abradability | |
| 249. |
Washing of coal is done to reduce the%! |
| A. | Inherent impurities |
| B. | Adhering impurities |
| C. | Mineral matter |
| D. | Both B and C |
| Answer» E. | |
| 250. |
'Wobbe index' is a characteristic of%! |
| A. | Solid fuels |
| B. | Gaseous fuels |
| C. | Liquid fuels |
| D. | Fat coals |
| Answer» C. Liquid fuels | |