Related Questions

Magnesite bricks have poor resistance to attack by __________ slag.
A Lime
B Basic
C Acid
D None of these
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
A Mortars
B Cements
C Castables
D None of these
If a refractory contains high content of silicon, it means refractory is
A Acidic
B Basic
C Neutral
D Brittle
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
Rate of slag attack on refractories increases with rise in temperature due to the
A Decreased viscosity of slag
B Increased thermal conductivity of brick
C Oxidising condition in the furnace
D None of these
Spalling resistance of a refractory can not be increased by
A Increasing its porosity
B Using a coarser grog during its manufacture
C Decreasing its thermal co-efficient of expansion
D Making it denser
Resistance to fusion of the refractory under a steady rising temperature condition is called
A Spalling
B Refractoriness
C Both A & B
D Neither A nor B
Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight
A 1.5
B 3
C 5
D 7
The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.
A Fluidity
B Basicity
C Acidity
D Viscosity
Blast furnace slag is mainly molten
A Sand
B Magnesium silicate
C Calcium silicate
D Iron pyrite

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