Related Questions

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
Spalling of a refractory means its
A Softening
B Fracture due to uneven expansion at high temperature
C Resistancce to compressive loads
D Resistance to chemical action of gases and molten fluxes
Spalling tendency of refractories is reduced by increasing its
A Porosity
B Specific gravity
C Thermal conductivity
D Strength
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
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
Refractory bricks resist
A High temperature
B Chemical action
C Dampness
D All the above
The tendency of a body to resist change from rest or motion is known as
A Mass
B Friction
C Inertia
D Resisting force
Spalling hammer is used for
A Driving wooden headed chisels
B Rough dressing of stones
C Carving of stones
D Breaking small projection of stones
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
A 770
B 570
C 270
D 70

Next steps