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
Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.
A Oxygen in
B Carbon dioxide in
C Carbon monoxide in
D Temperature of
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
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
Which of the following is not an additive for flue gases from furnace to reduce its dew-point?
A Ammonia
B Fine dolomite
C Alkaline powders
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

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