Fuel and Combustion MCQs Archives

331. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

Higher calorific value

Lower hydrogen content

Both A & B

Neither A nor B

✅ The correct answer is option D.

332. The gas which contributes maximum to the heating value of natural gas is

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.