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Spalling resistance of a refractory can not be increased by
Spalling of a refractory means its
Which of the following terms means the tendency of a supervisor to rate a subordinate lower than his performance? 1. Horns Effect 2. Halo Effect 3. Central Tendency 4. Pointing Tendency
Spalling tendency of refractories is reduced by increasing its
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?
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
If a refractory contains high content of silicon, it means refractory is
Ceramics make excellent refractory materials. A material is said to be refractory if it:
Refractory timber catches fire readily while non-refractory timber does not catch fire readily.
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.