What is the value of ‘q’ for saturated liquid feed to a distillation column ?
A. 0
B. <1
C. 1
D. >1
Refractory Technology
Faster rate of drying of moulded refractories results in high _____________ of refractories?
Faster rate of drying of moulded refractories results in high _____________ of refractories?
A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C.
Roof of a basic electric furnace is made of _____________ bricks?
Roof of a basic electric furnace is made of _____________ bricks?
A. Superduty fireclay
B. Silica
C. Chromite
D. None of these
Outer combustion chamber of blast furnace stove is lined with _____________ bricks?
Outer combustion chamber of blast furnace stove is lined with _____________ bricks?
A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia
Magnesite refractories are used for the construction of those furnaces, which are________________?
Magnesite refractories are used for the construction of those furnaces, which are________________?
A. Not required to resist the corrosive action of basic slag
B. Not subjected to fluctuation in temperature
C. Used for raising & maintaining high temperature
D. Both B. and C.
Test piece for determination of RUL of a refractory is heated in a/an____________________?
Test piece for determination of RUL of a refractory is heated in a/an____________________?
A. Oxidising atmosphere
B. Reducing atmosphere
C. Electric furnace
D. Neutral atmosphere
With increase in the alumina content, the refractoriness of high alumina refractories_______________?
With increase in the alumina content, the refractoriness of high alumina refractories_______________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
Thermal diffusivity of a refractory brick is high, when its ____________ is high?
Thermal diffusivity of a refractory brick is high, when its ____________ is high?
A. Density
B. Specific heat
C. Thermal conductivity
D. None of these
Magnesite refractories are generally not used in the___________________?
Magnesite refractories are generally not used in the___________________?
A. Electric furnace walls
B. Steel melting furnace
C. Open hearth furnace
D. Burning zone of cement kilns
High porosity refractory bricks have _______________?
High porosity refractory bricks have _______________?
A. Poor resistance to the penetration of molten slag, metal & flue gases
B. Poor heat conductivity & low strength
C. Better thermal spalling resistance
D. All A., B. and C.