Related Questions

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
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
A Fireclay
B Silicon carbide
C Corrundum
D Siliceous fireclay
Ceramic recuperators are generally made of
A Silicon carbide
B Calcium carbide
C Fireclay bricks
D High alumina bricks
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
Preheating of combustion air is done to
A Increase the adiabatic flame temperature
B Increase the calorific value of the fuel
C Complete the combustion of fuel
D Reduce its requirement for effecting the complete combustion
Regenerators compared to the recuperators for the same duty
A Occupy more space
B Are less costly
C Are of smaller size
D All of the above
Regenerators as compared to recuperators for the same duty
A Store smaller quantity of waste heat
B Are lighter & compact
C Involve higher initial cost
D All of the above
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
A 50
B 65
C 85
D 99
Preheating of __________ the flame temperature.
A The gaseous fuel before combustion decreases
B Combustion air decreases
C Either the fuel or the air or both, increases
D Either the fuel or the air does not affect
Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C.
A 50
B 70
C 90
D 140

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