KOH solution used in Orsat apparatus absorbs____________________?
A. CO2
B. SO2
C. Both A. & B.
D. Neither A. nor B.
Fuels and Combustion
In high temperature carbonisation of coal compared to low temperature carbonisation ?
In high temperature carbonisation of coal compared to low temperature carbonisation ?
A. Yield of ammonia is less
B. Aromatic content of tar is low
C. H2 content in the coke oven gas is more
D. Calorific value of the coke oven gas is lower
Presence of free moisture in coal during its high temperature carbonisation _____________________?
Presence of free moisture in coal during its high temperature carbonisation _____________________?
A. Reduces the coking time
B. Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot
oven walls
C. Increases the loss of fine coal dust from the ovens when charging
D. None of these
The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?
The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?
A. Type (solid, liquid or gaseous)
B. Calorific value
C. Sulphur content
D. Ignition temperature
‘Wobbe index’ is a characteristic of__________________?
‘Wobbe index’ is a characteristic of__________________?
A. Solid fuels
B. Gaseous fuels
C. Liquid fuels
D. Fat coals
Spontaneous combustion of coal on storage results due to___________________?
Spontaneous combustion of coal on storage results due to___________________?
A. Inadequate ventilation
B. Low temperature oxidation
C. Storage in large heaps with small surface to volume ratio
D. All A., B. and C.
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_________________?
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_________________?
A. Tar
B. Coke oven gas
C. Pitch
D. Pulverised coke
As the equilibrium moisture content of the coal increases, its___________________?
As the equilibrium moisture content of the coal increases, its___________________?
A. Calorific value increases
B. Swelling number decreases
C. Swelling number increases
D. Bulk density decreases
Which of the following is not used as a binder in coal briquetting ?
Which of the following is not used as a binder in coal briquetting ?
A. Tar
B. Molasses
C. Pitch
D. Line
Which of the following fuel gases has the highest calorific value ?
Which of the following fuel gases has the highest calorific value ?
A. Natural gas
B. Coal bed methane (CBM)
C. Liquefied petroleum gas (LPG)
D. Sewage gas