Related Questions

The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
A Lower than
B Higher than
C Same as
D Not related to
The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.
A Lower than
B Higher than
C Same as
D Not related to
Actual flame temperature is always lower than the adiabatic flame temperature, because there is
A No possibility of obtaining complete combustion at high temperature
B Always loss of heat from the flame
C Both A & B
D Neither A nor B
Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C.
A 50
B 70
C 90
D 140
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
A 50
B 65
C 85
D 99
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
A 250
B 650
C 850
D 1000
Which of the following does not require preheating during storage in the storage tank as well as during atomisation through burners?
A PCM
B Tar
C Light diesel oil
D Low viscosity furnace oil
Preheating prior to welding is done for the purpose of
A decreasing cooling rate
B facilitating fusion of high melting metals
C preventing hot cracking
D ensuring full penetration
Preheating is essential in welding
A Cast iron
B High speed steel
C All nonferrous materials
D All of the above
Which furnace employs preheating, heating and soaking zones?
A Soaking pit
B Reheating furnace
C Open hearth furnace
D Cupola

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