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
A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A Increase
B Decrease
C Remain unaffected
D May increase or decrease; depends on the thickness of each layer
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
Out of the following which is an insulating material?
A Copper
B Gold
C Silver
D Paper
Which of the following insulating materials was suitable for low temperature applications?
A Asbestos paper
B Diatomaceous earth
C 80 percent magnesia
D Cork
Which of the following is the most widely used insulating material for steam carray-ing pipelines?
A Ceramic fibre blanket
B Glass wool and 85% magnesia
C Vermiculite
D Slag wool
Which is not a natural insulating material?
A Diatomaceous earth/kieselgur
B Asbestos
C Vermiculite
D None of these
Which of the following insulating materials can withstand the highest temperature safely?
A Cellulose
B Asbestos
C Mica
D Glass fibre
Which of the following is the most widely used heat insulating material for pipelines carrying steam?
A Tar dolomite bricks followed by asbestos
B Fireclay refractory followed by aluminium sheet
C Cotton followed by aluminium foil
D 85% magnesia cement and glass wool

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