Related Questions

Roof of a basic open hearth furnace is lined with __________ bricks.
A Silica
B Fireclay
C Dolomite
D Magnesite
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
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
__________ 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
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
A Resistance
B Arc
C Low frequency induction
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
In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases
A Linearly with time
B Exponentially with time
C Logarithmically with time
D In proportion to the square root of time
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If Z is open, which of the following must be true?
A S is open
B T is open
C U is open
D y is open
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If R is closed and U is open, which of the following must be true?
A S is open
B T is open
C T is closed
D Y is closed

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