Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Decreases
Increases
Remains same
May increase or decrease ; depends on the type of fuel

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Fuels and Combustion
Calorific value of

Light paraffinic fuel oils is lower than that of equivalent olefins
Light paraffinic fuel oils is higher than that of equivalent olefins
N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is equal to that of equivalent olefins

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Fuels and Combustion
A coal with high ash content is undesirable, as

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
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
All of these
It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

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