Related Questions

Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
A Less shrinkage in heating, decreased apparent porosity & increased specific gravity
B High strength & thermal spalling resistance
C Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production
D All of the above
With increase in the porosity, thermal spalling resistance of fireclay brick
A increases
B decreases
C remains same
D may increase or decrease
The solid brick shown is made of small square shaped bricks of side 1. when the large brick is disassembled into its component small bricks. the total surface area of all the small bricks is how much greater than the surface area of the large brick?
A 32
B 40
C 60
D 72
The method of moving each brick through a small horizontal distance before it is finally laid in any brick wall and pressing it by means of brick hammer, is known as
A Troweling
B Laying
C Grouting
D Placing
Addition of stabiliser during PVC manufacture is done to
A Improve its impact strength
B Improve its elasticity
C Reduce the melt viscosity & glass transition temperature
D Prevent its thermal degradation
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
Maximum safe working temperature for fireclay bricks is about __________ °C.
A 1150
B 1300
C 1450
D 1550
Fireclay bricks is not used for lining the
A Cupola
B Gas producer
C Bottom of hot metal mixer
D Roof of open hearth furnace
Colour of fireclay bricks is
A Light buff to reddish buff
B Yellow
C Black
D None of these
Porosity of fireclay refractories is __________ percent.
A 5-10
B 10-25
C 25-35
D 35-50

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