Related Questions

Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Porosity of fireclay refractories is __________ percent.
A 5-10
B 10-25
C 25-35
D 35-50
Porosity is induced in insulating refractories by adding
A Powdered naphthalene
B Ammonium chloride/sulphate
C Calcium phosphate
D All of the above
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
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
A Fireclay
B Carborundum
C Graphite
D Chromite
Presence of MgO in alumino-silicate refractories __________ its refractoriness.
A Increases
B Lowers
C Does not affect
D Either A or B; depends on its quantity
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
A 55
B 70
C 80
D 90
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
A 10
B 15
C 20
D 30
The largest consumer of refractories is the __________ industry.
A Cement
B Metallurgical
C Fertiliser
D Power
Refractories used in/for __________ should have low thermal conductivity.
A Coke ovens
B Insulation
C Regenerators
D Muffle furnaces

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