A. Abradability
B. Reactivity
C. Agglutinating (binding) properties
D. Porosity
A. Volatiles
B. Ash
C. Iron
D. Moisture
A. Swelling characteristics
B. Abradability
C. Agglutinating properties
D. Resistance to impact breakage
A. 30
B. 300
C. 3,000
D. 30,000
A. Fixed carbon and having a heat value of 13, 200 BTU/1b
B. Ash and a heating value of 13, 200 BTU/1b
C. Fixed carbon and a heating value of 132 BTU/1b
D. None of these
A. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber
B. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace
and causes its spalling due to different co-efficient of expansion/contraction of the refractory
and the ash
C. The ash retains the sulphur & phosphorus and thus affects the quality of products in
metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to
the boiler tubes thereby reducing the heat transfer
D. All A., B. and C.
A. 5
B. 25
C. 55
D. 80