A. 2.5
B. 0.5
C. 10
D. 20
A. Ash fusion temperature
B. Calorific value
C. Ignition temperature
D. Caking index
A. Transport the coal to the burner
B. Dry the coal
C. Ensure efficient burning of coal around the burner
D. Reduce primary air requirement
Function of secondary air in pulverised coal firing is to_________________? Read More »
Fuels and Combustion A. Permits the use of high ash content coal
B. Permits the use of low fusion point ash coal
C. Accelerates the burning rate and economises on fuel combustion
D. All A., B. and C.
A. Junker’s
B. Bomb
C. Boy’s
D. None of these
A. Lignite
B. Semi-anthracite
C. Sub-bituminous
D. Bituminous
The most matured coal out of the following is__________________? Read More »
Fuels and Combustion A. Fixed carbon and having a heat value of 13, 200 BTU/1b
B. Ash and a heating value of 13, 200 BTU/1b
C. Fixed carbon and a heating value of 132 BTU/1b
D. None of these
(64-132) rank coal (ASTM) means a coal with 64%___________________? Read More »
Fuels and Combustion A. Volatile matter content increases
B. Carbon content decreases
C. Moisture content increases
D. Ash content increases
A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F. gas and coke oven gas
A. Sulphur & phosphorous content
B. Porosity
C. Fusion point of its ash
D. Hardness & strength
A good metallurgical coke should have very low__________________? Read More »
Fuels and Combustion