Heat from the flue gas is recovered in the heat recovery section located at the outlet of the burners.
The correct answer is: False
Heat is transferred from the flue gas to the heater tubes in a furnace by:
| a) | The convective heat transfer |
| b) | The radiation heat transfer |
| c) | Both a and b |
The choice of the type of the burner depends mainly on:
The correct answer is: The type of fuel
The burner which is designed to use the fuel oil and the fuel gas simultaneously is called:
| a) | The general purpose burner |
| b) | The combination oil and gas burner |
| c) | The oil burner |
| d) | None of the above |
Fuel oil must be dispersed into a fine mist to ensure efficient combustion in an oil burner. The process of converting the fuel oil into a fine mist is called:
is: Atomization
Atomization of the fuel oil is done to:
| a) | Increase the combustion efficiency |
| b) | Decrease the heat transfer area |
| c) | Control the combustion temperature |
| d) | None of the above |
Wrong
The correct answer is: Increase the combustion efficiency
Atomization of the fuel oil is achieved by __________.
| a) | Steam atomization |
| b) | Pressure atomization |
| c) | Mechanical atomization |
| d) | All the above |
For uniform heating of the process fluid, the heater tubes are placed __________ in the furnace.
| a) | Asymmetrically |
| b) | Symmetrically |
| c) | Either a or b |
A multi-pass furnace is one in which the process fluid passes through several bends of a single long tube inside the furnace.
| a) | True |
| b) | False |
In the heat recovery section of the furnace, the heat remaining in the flue gas is usually recovered by:
| a) | Heating the boiler feedwater |
| b) | Superheating the steam |
| c) | Either a or b |
Wrong
The correct answer is: Either a or b
Higher the heat recovered from the flue gas, __________ the furnace efficiency.
| a) | Higher |
| b) | Lower |
In some forced-draft furnaces, the __________ recovers heat from the flue gas.
| a) | Air register |
| b) | Fan |
| c) | Air blower |
| d) | Air pre-heater |
Wrong
The correct answer is: Air pre-heater
The earth gets heated by the sun through:
| a) | Convective heat transfer |
| b) | Radiative heat transfer |
| c) | Both a and b |
Wrong
The correct answer is: Radiative heat transfer
The natural-draft system should be used when the flue gas pressure drop is high.
| a) | True |
| b) | False |
Wrong
The correct answer is: False
The furnace pressure is usually controlled by:
| a) | The stack damper |
| b) | The air registers |
| c) | The burners |
| d) | All the above |
Wrong
The correct answer is: The stack damper
The draft, in furnace operation, is the pressure difference between:
| a) | The furnace inlet and the outlet |
| b) | The furnace and the atmosphere |
| c) | The fan and the air pre-heater |
| d) | None of the above |
Wrong
The correct answer is: The furnace and the atmosphere
Fuel oil must be dispersed into a fine mist to ensure efficient combustion in an oil burner. The process of converting the fuel oil into a fine mist is called:
| a) | Splitting |
| b) | Atomization |
| c) | Evaporation |
| d) | Combustion |
The earth gets heated by the sun through:
| a) | Convective heat transfer |
| b) | Radiative heat transfer...........is the correct answer |
| c) | Both a and b...........was your answer |
The earth gets heated by the sun through:
| a) | Convective heat transfer |
| b) | Radiative heat transfer...........is the correct answer |
| c) | Both a and b...........was your answer |
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