Fuels and Combustion
Gross and net calorific value of a fuel will be the same

Under no circumstances
Ifits carbon content is very low
If its ash content is zero
If its hydrogen/hydrogen compound content is zero

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
Presence of free moisture in coal during its high temperature carbonisation

Increases the loss of fine coal dust from the ovens when charging
Reduces the coking time
None of these
Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
Froth floatation is used for

All of these
Removing ash from the coal based on difference in specific gravity of coal and ash
Washing lump coal (> 80 mm size)
Washing fine coal dust (< 0.5 mm size)

ANSWER DOWNLOAD EXAMIANS APP