Fuels and Combustion
A coal having higher volatile matter content, has lower

Ignition temperature
Coke oven gas yield on carbonisation
Smoking tendency on burning
Chance of catching fire during storage in open space

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP

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

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
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

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Fuels and Combustion