Higher calorific value
Lower hydrogen content
Both A & B
Neither A nor B
✅ The correct answer is option D.
Fuel and Combustion MCQs
332. The gas which contributes maximum to the heating value of natural gas is
CO
CO₂
H₂
CH₄
✅ The correct answer is option D.
333. As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.
Decreases
Increases
Remains same
May increase or decrease depending on the type of fuel
✅ The correct answer is option B.
334. Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
500
750
950
1100
✅ The correct answer is option B.
335. Main use of soft coke is as __________ fuel.
Domestic
Blastfurnace
Foundary
None of these
✅ The correct answer is option A.
336. A travelling grate stoker is meant for the efficient burning of __________ coal.
Caking
Pulverised
Non-caking
High ash
✅ The correct answer is option C.
337. Which of the following constituents of coal is the most important in the production of coke?
Moisture
Ash
Volatiles
Carbon
✅ The correct answer is option D.
338. 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.
339. Coke having higher porosity has
Lower bulk density
Lower strength
Higher reactivity
All of the above
✅ The correct answer is option D.
340. Overfire burning in a furnace is a phenomenon characterised by the
Supply of excess fuel
Supply of excess air
Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air
None of these
✅ The correct answer is option C.