MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Power Plant knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Presence of free moisture in coal during its high temperature carbonisation __________ |
| A. | increases the loss of fine coal dust from the ovens when charging |
| B. | protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls |
| C. | reduces the coking time |
| D. | none of the mentioned |
| Answer» C. reduces the coking time | |
| 2. |
Atomising steam to fuel oil ratio in a burner should be around __________ |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 3.5 |
| Answer» B. 1.5 | |
| 3. |
“Overfire burning” in a furnace is a phenomenon characterised by the __________ |
| A. | burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air |
| B. | supply of excess fuel |
| C. | supply of excess air |
| D. | none of the mentioned |
| Answer» B. supply of excess fuel | |
| 4. |
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be? |
| A. | very high, if the fuel is of low calorific value |
| B. | low |
| C. | high |
| D. | none of the mentioned |
| Answer» C. high | |
| 5. |
Initial pressure of oxygen introduced into the ‘bomb’ of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm. |
| A. | 20-30 |
| B. | 60-65 |
| C. | 95-100 |
| D. | 3-5 |
| Answer» B. 60-65 | |
| 6. |
‘Fat’ coal means a coal having __________ |
| A. | low ash content |
| B. | non-smoking tendency |
| C. | high volatile matter |
| D. | low calorific value |
| Answer» D. low calorific value | |
| 7. |
Abrasion index of blast furnace coke should be around __________ percent. |
| A. | 20 |
| B. | 35 |
| C. | 80 |
| D. | 55 |
| Answer» D. 55 | |
| 8. |
Presence of free moisture in coal is most disadvantageous during __________ |
| A. | combustion of fire slacks on the grates |
| B. | its pulverisation |
| C. | handling (e.g. when emptying wagons) |
| D. | none of the mentioned |
| Answer» C. handling (e.g. when emptying wagons) | |