3244. The gas which contributes maximum to the heating value of natural gas is
CO
CO₂
H₂
CH₄
✅ The correct answer is option D.
3249. Main use of soft coke is as __________ fuel.
Domestic
Blastfurnace
Foundary
None of these
✅ The correct answer is option A.
3254. Fossil fuels mean
Solid fuels
Liquid fuels
Those fuels which are found in the crust of earth
Premature fuels with low calorific value
✅ The correct answer is option C.
3221. Pick the odd man out.
Briquettes
Wood
Oil gas
Pitch creosote mixture
✅ The correct answer is option B.
3225. Caking coal is desirable for
Burning on travelling grate
Coke making
Burning on firebars
All of the above
✅ The correct answer is option B.
3230. Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of
MgO & Na₂CO₃
MgSO₄ & BaCl₂
BaSO₄ & NaCl
MgCO₃ & NaCl
✅ The correct answer is option A.
3235. The internal energy of the combustion products is __________ compared to that of reactants.
More
Less
Equal
More or less ; (depends on the state of fuel.)
✅ The correct answer is option B.
3240. Naphthalene recovered from coke oven gas is used
As moisture proof coating on fibres
As moth balls (insecticides)
As a fuel in furnaces
For making electrodes
✅ The correct answer is option B.
3245. __________ has the widest inflammability limit (explosion limit) of all the gases.
Hydrogen
Carbon monoxide
Acetylene
Methane
✅ The correct answer is option C.
3250. Main use of hard coke produced by high temperature carbonisation is in the
Iron blast furnace
Cupola in foundaries
Sinter making
Domestic ovens
✅ The correct answer is option A.