Related Questions

Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as
A Superheater
B Air-preheater
C Economizer
D Injector
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as
A Efficiency of the boiler
B Efficiency of the chimney
C Efficiency of the fan
D Power of the boiler
Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an
A Economiser
B Steam superheater
C Air preheater
D All of the above
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
A device used to heat feed water by utilizing the heat in me exhaust flue gases before leaving through the chimney, is known as
A Economizer
B Fusible plug
C Superheater
D Stop valve
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?
A CO2
B O2
C NO
D NO2
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
A 350
B 750
C 1050
D 1250
Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
A Economiser
B Regenerator
C Ceramic recuperator
D Waste heat boiler
The heat recoverable from flue gases of furnaces depends on the
A Thermal efficiency of furnace
B Quantity of flue gases
C Flue gas temperature drop through the furnace
D All of the above

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