A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C.
Related Mcqs:
- Pure oxide refractories are generally monocrystalline in nature and are self bonded ______________ bricks are generally used as moderator in nuclear reactors?
A. Beryllia
B. Carborundum
C. Corundum
D. Thoria - Refractories used in/for ______________ should have low thermal conductivity?
A. Coke ovens
B. Insulation
C. Regenerators
D. Muffle furnaces - Panel test determines the ______________ of refractories?
A. Fusion point
B. Spalling resistance
C. Slag penetration resistance
D. Refractoriness under load (RUL) - 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 - Thermal diffusivity of a refractory brick is high, when its ______________ is high?
A. Density
B. Specific heat
C. Thermal conductivity
D. None of these - Gases diffuse faster compared to liquids because of the reason that the liquid molecules_________________?
A. Are held together by stronger inter-molecular forces
B. Move faster
C. Have no definite shape
D. Are heavier - Refractoriness/fusion points of ‘Superduty’ refractories is _____________ °C?
A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000 - Magnesite refractories are generally not used in the__________________?
A. Electric furnace walls
B. Steel melting furnace
C. Open hearth furnace
D. Burning zone of cement kilns - Chemically, mullite refractories is________________?
A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2 - Magnesite refractories are used for the construction of those furnaces, which are_______________?
A. Not required to resist the corrosive action of basic slag
B. Not subjected to fluctuation in temperature
C. Used for raising & maintaining high temperature
D. Both B. and C.
