Fuels and Combustion
Bunsen burner is an example of a/an __________ burner.

Submerged combustion
Outside mixing/diffusion flame/nozzle mix type
Rotary cup
Inside mixing/premix type

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Fuels and Combustion
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Requires smaller combustion space and less secondary air
Is less liable to spontaneous combustion on storage
None of these
Is more difficult to ignite and produces a shorter flame

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

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

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