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.
| 51. |
Calorific value of coke oven gas is around __________ Kcal/Nm 3 . |
| A. | 900 |
| B. | 4200 |
| C. | 7500 |
| D. | 2000 |
| Answer» C. 7500 | |
| 52. |
Dust content in raw blast furnace gas is about __________ gm/Nm 3 , hence it is cleaned to the dust level of about < 10 mg /Nm 3 before use. |
| A. | 15-30 |
| B. | 1-2 |
| C. | 70-100 |
| D. | 150-200 |
| Answer» B. 1-2 | |
| 53. |
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. | |
| 54. |
Mineral matter, ' M ' and ash percentage ' A ' in coal are roughly related as |
| A. | M = 1.8 A |
| B. | M = 0.5 A |
| C. | M = 1.1 A |
| D. | M = A |
| Answer» D. M = A | |
| 55. |
Mixed gas' used in steel plants is a mixture of |
| A. | B.F. gas and coke oven gas. |
| B. | coke oven gas and converter gas. |
| C. | coke oven gas and L.P.G. |
| D. | blast furnace gas and naphtha vapor. |
| Answer» B. coke oven gas and converter gas. | |
| 56. |
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm 3 gas ? |
| A. | Blast furnace gas |
| B. | Natural gas |
| C. | Producer gas |
| D. | Water gas |
| Answer» C. Producer gas | |
| 57. |
Calorific value of gobar gas (containing CH 4 = 60% , H 2 = 10% ; CO 2 = 30%) may be about __________ Kcal/Nm 3 . |
| A. | 1800 |
| B. | 3200 |
| C. | 5400 |
| D. | 10200 |
| Answer» D. 10200 | |
| 58. |
If CO 2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as |
| A. | O 2 |
| B. | CO |
| C. | N 2 |
| D. | SO 2 |
| Answer» E. | |
| 59. |
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm 3 ), while the C.V. is same on weight basis (i.e., kcal/kg) ? |
| A. | Propane and acetylene |
| B. | Propane and LPG |
| C. | Sewage gas and gobar gas |
| D. | B.F. gas and coke oven gas |
| Answer» B. Propane and LPG | |
| 60. |
The calorific value of a gas of composition CO 2 = 20%, H 2 = 50%, CH 4 = 30%, is y . If the composition of gas is changed to H 2 = 50%, CH 4 = 30%, CO 2 = 10%, N 2 = 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 | |
| 61. |
Which of the following is not a by-product fuel ? |
| A. | Pitch |
| B. | Blast furnace gas |
| C. | Petrol |
| D. | Refinery gas |
| Answer» D. Refinery gas | |
| 62. |
Fuel' can be defined as a substance which produces heat by |
| A. | combustion. |
| B. | nuclear fission. |
| C. | nuclear fusion. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 63. |
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm 3 . |
| A. | 30 |
| B. | 300 |
| C. | 3000 |
| D. | 30, 000 |
| Answer» C. 3000 | |
| 64. |
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 | |
| 65. |
Ammonia content in raw coke oven gas is about __________ gm/Nm 3 . |
| A. | 1 |
| B. | 15 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 66. |
Dry air requirement for burning 1 Nm 3 of CO to CO 2 may be around __________ Nm 3 . |
| A. | 2.4 |
| B. | 1.75 |
| C. | 0.87 |
| D. | 11.4 |
| Answer» B. 1.75 | |
| 67. |
When steam is passed over coal resulting in the endothermic reaction represent by, C + H 2 O = CO + H 2 , it is called the __________ of coal. |
| A. | carbonisation |
| B. | oxidation |
| C. | coalification |
| D. | gasification |
| Answer» E. | |
| 68. |
Mineral matter content ( M ) and ash content ( A ) in coal are approximately related as |
| A. | M = 1.1 A |
| B. | M = A |
| C. | M = 1.5 A |
| D. | M = 2 A |
| Answer» B. M = A | |
| 69. |
Coke oven gas is stripped of its H 2 S 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. | |
| 70. |
Yield of blast furnace gas is about __________ Nm 3 /ton of pig iron. |
| A. | 300 |
| B. | 2000 |
| C. | 5000 |
| D. | 10000 |
| Answer» C. 5000 | |
| 71. |
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the |
| A. | requirement of large volume combustion chamber. |
| B. | risk of explosion. |
| C. | chances of clinker formation. |
| D. | incomplete combustion of coal. |
| Answer» C. chances of clinker formation. | |
| 72. |
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm 3 /ton of dry coal. |
| A. | 60 |
| B. | 160 |
| C. | 500 |
| D. | 750 |
| Answer» C. 500 | |
| 73. |
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 | |
| 74. |
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 | |
| 75. |
Which of the following is the most reactive (as regards the formation of CO + H 2 from C + H 2 O) ? |
| A. | Blast furnace coke |
| B. | Low temperature coke |
| C. | Anthracite coal |
| D. | Sub-bituminous coal |
| Answer» C. Anthracite coal | |
| 76. |
Wobbe index' is a characteristic of |
| A. | solid fuels |
| B. | gaseous fuels |
| C. | liquid fuels |
| D. | fat coals |
| Answer» C. liquid fuels | |