Fuels and Combustion
__________ prohibits the use of alcohols directly in petrol engines.

High cost & availability
Low calorific value
Low octane number
Low flash point

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Fuels and Combustion
Coke oven gas is a better fuel than blast furnace gas, because of its higher

All of these
Adiabatic flame temperature
Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
Heat release rate (thus requiring smaller combustion chamber)

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

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