Which of the following petrographic constituents of coal is non-coking ?
A. Vitrain
B. Clarain
C. Durain
D. Fussain
Fuels and Combustion
The reaction, C + CO2 ↔ 2CO, taking place during coal gasification is called the ______________ reaction?
The reaction, C + CO2 ↔ 2CO, taking place during coal gasification is called the ______________ reaction?
A. Neumann reversal
B. Shift conversion
C. Boudouard
D. Reduction
Presence of phosphorous in metallurgical coal__________________?
Presence of phosphorous in metallurgical coal__________________?
A. Is not undesirable
B. Reduces its calorific value
C. Badly affects the quality of steel
D. Increases its caking power
Which is the heaviest fuel gas out of the following ?
Which is the heaviest fuel gas out of the following ?
A. Blast furnace gas
B. Coke oven gas
C. Water gas
D. Carburetted water gas
The calorific value of producer gas is around _____________ kcal/Nm3?
The calorific value of producer gas is around _____________ kcal/Nm3?
A. 1300
B. 500
C. 4500
D. 9000
Short/intense flame is produced during combustion of gaseous fuel by using________________?
Short/intense flame is produced during combustion of gaseous fuel by using________________?
A. High amount/current of combustion air
B. Low amount/current of combustion air
C. Preheated secondary air
D. Very little excess air
During combustion of coal on grate, clinker formation is increased by the___________________?
During combustion of coal on grate, clinker formation is increased by the___________________?
A. Use of thick fire bed
B. Low fusion point of ash (< 1100° C)
C. Use of preheated primary air
D. All A., B. & C.
Calorific value of coke even gas produced by low temperature carbonisation of coal is about ____________ Kcal/Nm3?
Calorific value of coke even gas produced by low temperature carbonisation of coal is about ____________ Kcal/Nm3?
A. 4000
B. 2500
C. 6500
D. 10000
Softening temperature of coal ash is a measure of the _____________ of coal?
Softening temperature of coal ash is a measure of the _____________ of coal?
A. Caking tendency
B. Coking tendency
C. Clinkering tendency
D. Size stability
A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________?
A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________?
A. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
C. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06
D. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74