Related Questions

Basic open hearth furnace (BOF) is not used for producing __________ steel.
A Killed
B Rimming
C High alloy
D None of these
Which is not a hearth furnace?
A Glass tank furnace
B Open hearth furnace
C Cupola
D Reheating furnace
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
A Non-wetting characteristic
B High thermal conductivity
C High crushing strength
D None of these
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
A Sidefired
B Underfired
C Covered
D Recirculating
Roof of a basic open hearth furnace is lined with __________ bricks.
A Silica
B Fireclay
C Dolomite
D Magnesite
__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
A High thermal conductivity
B Low porosity
C Non-wetting characteristics
D High density
Bottom of basic open hearth furnace are constructed of
A Dead burnt magnesite ramming mass
B Porous fireclay bricks
C Semi-silica bricks
D Silicon carbide bricks
Which of the following methods is used to control temperature in resistance furnaces?
A Variation of resistance
B Variation of voltage
C Periodical switching on and off of the supply
D All of the above methods
Magnesite bricks are used in those parts of furnaces, which are
A Subjected to temperature fluctuation
B Required to resist corrosive basic slag
C Subjected to high load
D None of these
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
A Babbitt metal
B Monel metal
C Nichrome
D Phosphor bronze

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