3008. 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
Tar
Coke oven gas
Pitch
Pulverised coke
✅ The correct answer is option B.
3014. Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?
Carburetted water gas
Blast furnace gas
Natural gas
Producers
✅ The correct answer is option C.
3015. __________ is used as jet engine fuel.
Petrol
Diesel
Kerosene
LPG
✅ The correct answer is option C.
3023. With increase in the oxygen content of the coal, its __________ decreases.
Calorific value
Caking power
Both A & B
Neither A nor B
✅ The correct answer is option C.
2990. Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in
KOH
Ammoniacal cuprous chloride
Pyrogallol solution
None of these
✅ The correct answer is option D.
2991. Gross heating value of coal is __________ the net heating value.
Higher than
Lower than
Same as
None of these
✅ The correct answer is option A.
2996. If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
Low
High
Very high, if the fuel is of low calorific value
None of these
✅ The correct answer is option A.
3001. For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
Increase
Decrease
Increase or decrease depending on the fuel type
Not change
✅ The correct answer is option B.
3010. Caking index of the coal blend used for the manufacture of metallurgical coke should be around
5
21
40
48
✅ The correct answer is option B.
3016. The heat of combustion of a fuel
Is equal to the heat of formation
Is always negative
Can’t be known without calculating it
Is always positive
✅ The correct answer is option B.