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
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
Which is a neutral refractory?
A Graphite
B Magnesite chrome
C Silica
D Magnesia
If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called
A Balanced beam
B Under reinforced beam
C Over reinforced beam
D None of the above
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when
A There is no load on the generator
B The generator runs on full load
C The generator runs on overload
D The generator runs on designed speed
In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.
A Same as
B Less than
C Greater than
D None of these
Which of the following is not a high alumina refractory material?
A Kyanite
B Sillimanite
C Diaspore
D Periclase
Which of the following is not an acidic refractory?
A Silica bricks
B Fireclay bricks
C Bauxite bricks
D Magnesia bricks
Which is not an acidic refractory?
A Silica
B Fireclay
C High alumina refractory
D Carbon black

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