Related Questions

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
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
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
Thermal diffusivity of a refractory brick is high, when its __________ is high.
A Density
B Specific heat
C Thermal conductivity
D None of these
An indication of degree of firing in silica brick is its
A Specific gravity
B Fusion point
C RUL
D None of these
Semi-silica bricks compared to silica bricks have
A Less fusion point
B Better spalling resistance
C Both A & B
D Neither A nor B
Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called
A Spalling resistance
B Refractoriness
C Refractoriness under load (RUL)
D None of these
Firing of refractory brick is done to
A Dehydrate the dried refractory
B Develop stable mineral forms in them
C Form ceramic bonds necessary for development of high crushing strength in the finished product
D All of the above

Next steps