Caking coals are those which :
A. form lumps or masses of coke
B. burn freely
C. show little or no fusing action
D. burn completely
E. do not form ash
Water and sediment in fuel oil can be removed by :
A. heating the oil in the settling tanks
B. cooling the oil in the settling tanks
C. burning the oil
D. suspension
E. filtering
Presence of moisture in fuel oil would :
A. keep the burner tips cool
B. aid in proper combustion
C. cause sputtering, possibly extinguishing flame
D. clean the nozzles
E. reduce flame length
O2 content in atmospheric air on volume basis is :
A. 21%
B. 23%
D. 30%
D. 40%
E. 70%
The economizer is used in boilers to :
A. increase thermal efficiency of boiler
B. economise on fuel
C. extract heat from the exhaust flue gases
D. increase flue gas temperature
E. to heat feed water by bled steam
For combustion of a fuel, following is essential :
A. correct fuel air ratio
B. proper ignition temperature
C. 02 to support combustion
D. all the three above
E. none of the above
Bomb calorimeter is used to determine :
A. Higher calorific value at constant volume
B. Lower calorific value at constant volume ,
C. Higher calorific value at constant pressure
D. Lower calorific value at constant pressure
E. None of the above
Proximate analysis of fuel is determination of percentage of :
A. carbon, hydrogen, nitrogen, sulphur, moisture
B. fixed carbon, ash, volatile matter, moisture
C. higher calorific value
D. lower calorific value
E. rough analysis
Reheating of steam under ideal conditions takes place at constant :
A. entropy
B. enthaply
C. pressure
D. temperature
E. all of the above
