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
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
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
The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the
A Nature of both the gas & the liquid
B Temperature
C Total pressure
D None of these
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of
A Higher effectiveness of boiler
B High calorific value coal being burnt
C Fouling of heat transfer surfaces
D Raising of steam temperature
Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
A CO content
B Dew point
C CO2 content
D O2 content
High sulphur content in a fuel __________ of the flue gases.
A Decreases the dew point
B Increases the dew point
C Reduces the combustion efficiency by limiting the permissible temperature reduction
D Both B & C
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
A Coke oven
B Blast furnace stoves
C Beehive coke oven
D High pressure boiler
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
The temperature of flue gases at air heater outlet should be
A 100°C
B Above dew point temperature of flue gases
C Below dew point temperature of flue gases
D Less than wet bulb temperature of flue gases

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