MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Energy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the purpose of secondary fan’s air in under feed system? |
| A. | To support gases coming out of fuel bed |
| B. | To clear the ash from the upper beds |
| C. | To maintain constant pressure in system |
| D. | To support combustion of system |
| Answer» B. To clear the ash from the upper beds | |
| 2. |
Which reaction differs over feed and under feed system? |
| A. | Changes occurring in physical properties of the system |
| B. | Breaking of molecular structure |
| C. | Changes in chemical composition |
| D. | Existence of volatile matter |
| Answer» C. Changes in chemical composition | |
| 3. |
Which is the process from which heat for distillation comes, in under feed system? |
| A. | Conduction |
| B. | Combustion |
| C. | Synthesis reaction |
| D. | Circulation of hot air gases |
| Answer» B. Combustion | |
| 4. |
Why does burnt gases with content of N2, CO2, H2, O2 and H2O re-enter the boiler in overfeed system? |
| A. | To dismiss the ash content in the gases formed |
| B. | Due to incomplete burning |
| C. | For complete removal of moisture |
| D. | To complete the burn the coal |
| Answer» C. For complete removal of moisture | |
| 5. |
The amount of CO2 formed in overfeed system entirely depends on ___________ |
| A. | Amount of ash produced |
| B. | Carbon content in fuel |
| C. | Rate of air supply |
| D. | Intensity of process |
| Answer» D. Intensity of process | |
| 6. |
WHICH_IS_THE_PROCESS_FROM_WHICH_HEAT_FOR_DISTILLATION_COMES,_IN_UNDER_FEED_SYSTEM??$ |
| A. | Conduction |
| B. | Combustion |
| C. | Synthesis reaction |
| D. | Circulation of hot air gases |
| Answer» B. Combustion | |
| 7. |
What is the purpose of secondary fan’s air in under feed system?$# |
| A. | To support gases coming out of fuel bed |
| B. | To clear the ash from the upper beds |
| C. | To maintain constant pressure in system |
| D. | To support combustion of system |
| Answer» B. To clear the ash from the upper beds | |
| 8. |
Which reaction differs over feed and under feed system?$ |
| A. | Changes occurring in physical properties of the system |
| B. | Breaking of molecular structure |
| C. | Changes in chemical composition |
| D. | Existence of volatile matter |
| Answer» C. Changes in chemical composition | |
| 9. |
Why does over feed burning system takes longer time for complete burning? |
| A. | The volatile matter will be cooler at initial |
| B. | Due to the presence of dust and ash |
| C. | The effect of design of system |
| D. | Effects of air fuels on the system |
| Answer» B. Due to the presence of dust and ash | |
| 10. |
Which type of coal is used in the under feed system? |
| A. | Anthracite coal |
| B. | Bituminous coal |
| C. | Briquette coal |
| D. | Pulverized coal |
| Answer» C. Briquette coal | |
| 11. |
What is the significance of rate at which air is supplied in the under feed system? |
| A. | Increase depth of incandescent zone |
| B. | Pushes up ignition zone |
| C. | Burns fuel for long time |
| D. | Supports combustion |
| Answer» B. Pushes up ignition zone | |
| 12. |
In which direction does fuel and air in under-feed system move? |
| A. | Opposite |
| B. | Across |
| C. | Same direction |
| D. | Counter direction |
| Answer» D. Counter direction | |
| 13. |
In which direction does fuel, coke and ash in fuel bed move with respect to air and gases in overfeed system? |
| A. | Upward direction |
| B. | Same direction |
| C. | Opposite direction |
| D. | Downward direction |
| Answer» D. Downward direction | |
| 14. |
Why does burnt gases with content of N2, CO2, H2, O2 and H2O re-enter the boiler in overfeed system? |
| A. | To dismiss the ash content in the gases formed |
| B. | Due to incomplete burning |
| C. | For complete removal of moisture |
| D. | To complete the burn the coal |
| Answer» C. For complete removal of moisture | |
| 15. |
Why is secondary air supplied in overfeed system? |
| A. | To burn the unburnt gases |
| B. | To maintain constant heat intensity |
| C. | To completely remove water vapors formed due to primary air supply |
| D. | To create distillation process for the raw coal supplied |
| Answer» B. To maintain constant heat intensity | |
| 16. |
Where does the ignition zone lie in overfeed system? |
| A. | Below the raw fuel undergoing distillation |
| B. | Below the combustion zone |
| C. | In between coke bed and flame zone |
| D. | Between coke bed and green coal bed |
| Answer» B. Below the combustion zone | |
| 17. |
How is volatile matter of raw coal is lost in the overfeed system? |
| A. | Condensation |
| B. | Distillation |
| C. | Combustion |
| D. | Evaporation |
| Answer» C. Combustion | |
| 18. |
Which is the zone where the water vapors carried in air reacts with carbon in over-feed system? |
| A. | Green coal bed zone |
| B. | Incandescent zone |
| C. | Combustion zone |
| D. | At the ash pit |
| Answer» C. Combustion zone | |
| 19. |
The amount of CO2 formed in overfeed system entirely depends on ___________ |
| A. | Amount of ash produced |
| B. | Carbon content in fuel |
| C. | Rate of air supply |
| D. | Intensity of process |
| Answer» D. Intensity of process | |
| 20. |
How is the coal fed to the grate in over feed system? |
| A. | Above the point of air admission |
| B. | Between the beds of incandescent coke and green coal |
| C. | Above the ash bed |
| D. | Between the point of air admission |
| Answer» B. Between the beds of incandescent coke and green coal | |