Related Questions

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
Ceramic recuperators compared to metallic recuperators for the same duty
A Are lighter
B Occupy more space
C Are less costly
D Have higher pressure differential between flue gas & air side
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
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
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
A 250
B 650
C 850
D 1000
Ceramic recuperators are generally made of
A Silicon carbide
B Calcium carbide
C Fireclay bricks
D High alumina bricks
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
A Quantity & temperature of waste gas
B Dust concentration & nature of dust in waste gas
C Corrosive nature of the waste gas
D All of the above
In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?
A Recuperator
B Regenerator
C Waste heat boiler
D None of these
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

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