A. Greater resistance to corrosion by slags
B. Less resistance to corrosion by slags
C. High spalling tendency
D. None of these
Related Mcqs:
- Refractory bricks having high thermal conductivity is desirable, when it is to be used in the _________________?
A. L.D. converter
B. Blast furnace
C. Rotary kiln
D. Recuperator - Highly porous refractory bricks are ____________________?
A. Less susceptible to chemical attack by molten fluxes and gases etc
B. Very strong
C. Having very high thermal conductivity
D. None of these - Resistance to fusion of the refractory under a steady rising temperature condition is called ____________________ ?
A. Spalling
B. Refractoriness
C. Both A. & B.
D. Neither A. nor B. - Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because__________________?
A. Its calorific value is very less
B. Tar neutralises the residual acids present in pitch
C. It reduces viscosity and imparts fluidity for its transportation through pipelines at economic
pressure drop
D. All A, B. and C. - The main product of high temperature carbonisation of coal is_____________________?
A. Coke
B. Ammonia
C. Tar
D. Phenol - The yield of tar from high temperature carbonisation of dry coal is about _______________ percent?
A. 3
B. 12
C. 22
D. 0.3 - High temperature carbonisation of coal takes place at __________________ °C?
A. 2000
B. 700
C. 1100
D. < 500 - High temperature carbonisation of coal produces _____________________ ?
A. Inferior coke compared to low temperature carbonisation
B. Less of gases compared to liquid products
C. Larger quantity of tar compared to low temperature carbonisation
D. None of these - Fusion of limestone and ______________ produces high alumina cement?
A. Sand
B. Bauxite
C. Quicklime
D. Calcite - Superior quality laboratory apparatus is made of the _____________ glass having low thermal co-efficient of expansion & high chemical resistance?
A. Flint
B. Soda
C. Pyrex
D. Potash
