MCQOPTIONS
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MCQOPTIONS
This section includes 76 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is used for making the explosive \'TNT\' ? |
| A. | Toluene |
| B. | Benzol |
| C. | Cerosote |
| D. | Pyridine |
| Answer» B. Benzol | |
| 2. |
Calorific value of gobar gas (containing CH4 = 60% , H2 = 10% ; CO2 = 30%) may be about __________ Kcal/Nm3. |
| A. | 3200 |
| B. | 1800 |
| C. | 10200 |
| D. | 5400 |
| Answer» E. | |
| 3. |
When steam is passed over coal resulting in the endothermic reaction represent by, C H2O = CO H2, it is called the __________ of coal. |
| A. | oxidation |
| B. | carbonisation |
| C. | gasification |
| D. | coalification |
| Answer» D. coalification | |
| 4. |
Which of the following is the most reactive (as regards the formation of CO H2 from C H2O) ? |
| A. | Low temperature coke |
| B. | Blast furnace coke |
| C. | Sub-bituminous coal |
| D. | Anthracite coal |
| Answer» B. Blast furnace coke | |
| 5. |
\'Wobbe index\' is a characteristic of |
| A. | gaseous fuels |
| B. | solid fuels |
| C. | fat coals |
| D. | liquid fuels |
| Answer» B. solid fuels | |
| 6. |
Which of the following is not a \'manufactured\' fuel ? |
| A. | Coal briquettes |
| B. | LPG |
| C. | Colloidal fuels |
| D. | Tar |
| Answer» E. | |
| 7. |
Junkar\'s calorimeter is used to determine the calorific value of |
| A. | gaseous fuels |
| B. | pulverised coal |
| C. | none of these |
| D. | fuel oil |
| Answer» B. pulverised coal | |
| 8. |
With increase in C/H ratio of a fuel, the amount of CO 2 formed on its complete combustion |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | either (a) or (b), depends on other factors |
| Answer» B. decreases | |
| 9. |
The calorific value of L.D. converter gas is about __________ Kcal/Nm 3 . |
| A. | 1800 |
| B. | 800 |
| C. | 4500 |
| D. | 10000 |
| Answer» B. 800 | |
| 10. |
About __________ Nm 3 of air will be required for the complete combustion of 2Nm 3 of CO. |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 1 |
| Answer» D. 1 | |
| 11. |
The calorific value of producer gas is around __________ kcal/Nm 3 |
| A. | 1300 |
| B. | 500 |
| C. | 4500 |
| D. | 9000 |
| Answer» B. 500 | |
| 12. |
The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm 3 . |
| A. | 5000 |
| B. | 25, 000 |
| C. | 10, 000 |
| D. | 15, 000 |
| Answer» C. 10, 000 | |
| 13. |
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO 2 , 20%CO and 10%O 2 . The percent excess oxygen used is |
| A. | 20 |
| B. | 12.5 |
| C. | 0 |
| D. | 10 |
| Answer» D. 10 | |
| 14. |
Fat' coal means a coal having |
| A. | low calorific value. |
| B. | high volatile matter, |
| C. | low ash content. |
| D. | non smoking tendency. |
| Answer» C. low ash content. | |
| 15. |
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm 3 . |
| A. | 4000 |
| B. | 2500 |
| C. | 6500 |
| D. | 10000 |
| Answer» D. 10000 | |
| 16. |
A sample of natural gas containing 80% methane (CH 4 ) and rest nitrogen (N 2 ) is burnt with 20% excess air. With 80% of the combustibles producing CO 2 and the reminder going to CO, the Orsat analysis in volume percent is |
| A. | CO 2 : 6.26, CO : 1.56, O 2 : 3.91, H 2 O :15.66, N 2 : 72.60 |
| B. | CO 2 : 7.42, CO : 1.86, O 2 : 4.64, N 2 :86.02 |
| C. | CO 2 : 6.39, CO : 1.60, O 2 : 3.99, H 2 O:25.96, N 2 :72.06 |
| D. | CO 2 : 7.60, CO : 1.90, O 2 : 4.75, N 2 : 85.74 |
| Answer» C. CO 2 : 6.39, CO : 1.60, O 2 : 3.99, H 2 O:25.96, N 2 :72.06 | |
| 17. |
Temperature of coke oven gas just before entering into saturator (for recovery of NH 3 ) is about __________ °C. |
| A. | 30 |
| B. | 65 |
| C. | 120 |
| D. | 180 |
| Answer» C. 120 | |
| 18. |
Which adsorbant is used for removing sulphur compounds (S Q, H 2 S, 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. | |
| 19. |
Calorific value of wood gas is about __________ kcal/Nm 3 . |
| A. | 1500 |
| B. | 3300 |
| C. | 5400 |
| D. | 8500 |
| Answer» C. 5400 | |
| 20. |
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 | |
| 21. |
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 | |
| 22. |
A carbonaceous fuel (containing no H 2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO 2 . 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. | |
| 23. |
C.V. (kcal/Nm 3 ) 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. | |
| 24. |
The maximum percentage of CO 2 in a flue gas (from a carbonaceous fuel) can be |
| A. | 21 |
| B. | 77 |
| C. | 79 |
| D. | 29 |
| Answer» B. 77 | |
| 25. |
The reaction, C + CO 2 2CO, taking place during coal gasification is called the __________ reaction. |
| A. | Neumann reversal |
| B. | shift conversion |
| C. | Boudouard |
| D. | reduction |
| Answer» D. reduction | |
| 26. |
The average molecular weight of a flue gas having the composition by volume as CO 2 = 25%, O 2 = 25%, N 2 = 50% will be |
| A. | 27.6 |
| B. | 23 |
| C. | 47.3 |
| D. | 42.9 |
| Answer» C. 47.3 | |
| 27. |
Bulk density of pulverised coal may be about __________ kg/m 3 . |
| A. | 100 |
| B. | 500 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 28. |
Calorific value of of blast furnace gas is around __________ KCal/Nm 3 . |
| A. | 850 |
| B. | 1800 |
| C. | 4200 |
| D. | 6500 |
| Answer» B. 1800 | |
| 29. |
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 | |
| 30. |
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm 3 /ton coal (ash = 35%). |
| A. | 150 |
| B. | 1500 |
| C. | 3500 |
| D. | 5000 |
| Answer» C. 3500 | |
| 31. |
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm 3 )? |
| A. | Producer gas |
| B. | Carburetted water gas |
| C. | Natural gas |
| D. | Liquified petroleum gas |
| Answer» E. | |
| 32. |
The combustion reaction, C + O 2 = CO 2 , is |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | none of these |
| Answer» B. endothermic | |
| 33. |
Which of the following has the least calorific value (kcal/Nm 3 ) ? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Sewage gas |
| D. | Natural gas |
| Answer» B. Coke oven gas | |
| 34. |
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 | |
| 35. |
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 | |
| 36. |
As the C/H ratio of the fuel increases, the amount of CO 2 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 | |
| 37. |
Oxygen required for theoretically complete combustion of 1 Nm 3 methane is __________ Nm 3 . |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 1 |
| Answer» B. 4 | |
| 38. |
Abel apparatus is used for those oils, whose flash points are___°F. |
| A. | <120 |
| B. | >120 |
| C. | >280 |
| D. | 300-600 |
| Answer» B. >120 | |
| 39. |
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 | |
| 40. |
The calorific value of natural gas is about __________ kcal/Nm 3 . |
| A. | 10, 000 |
| B. | 2500 |
| C. | 25, 000 |
| D. | 35, 000 |
| Answer» B. 2500 | |
| 41. |
Which of the following has the highest calorific value (kcal/Nm 3 ) ? |
| A. | Carburetted water gas |
| B. | Gobar gas |
| C. | Natural gas |
| D. | LPG |
| Answer» E. | |
| 42. |
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 | |
| 43. |
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. | |
| 44. |
Which of the following will generate maximum volume of product of complete combustion (Nm 3 /Nm 3 of fuel) ? |
| A. | Carburetted water gas |
| B. | Blast furnace gas |
| C. | Natural gas |
| D. | Producers' gas |
| Answer» D. Producers' gas | |
| 45. |
The gasification reaction represented by, C + H 2 O = CO + H 2 , is |
| A. | exothermic |
| B. | endothermic |
| C. | catalytic |
| D. | autocatalytic |
| Answer» C. catalytic | |
| 46. |
Fat coals' are those coals which have very high |
| A. | caking capacity. |
| B. | volatile matter content. |
| C. | fusion point of its ash. |
| D. | inherent moisture content. |
| Answer» B. volatile matter content. | |
| 47. |
Volumetric ratio of N 2 to O 2 in dry atmospheric air is |
| A. | 0.21 |
| B. | 3.76 |
| C. | 4.76 |
| D. | 0.79 |
| Answer» C. 4.76 | |
| 48. |
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 | |
| 49. |
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 | |
| 50. |
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 | |