Higher calorific value at constant volume
Gross calorific value at constant pressure
Lower calorific value at constant pressure
Net calorific value at constant volume
✅ The correct answer is option A.
Fuel and Combustion MCQs
372. Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
Hot scarfing of steel slabs
Mixing with blast furnace gas
Coke oven battery heating
Steel ladle drying
✅ The correct answer is option C.
373. In high temperature carbonisation (as compared to low temperature carbonisation) of coal
Coke oven gas yield is more
Tar yield is less but free carbon in tar is more
Calorific value of coke oven gas is less
All of the above
✅ The correct answer is option D.
374. Which of the following is not a manufactured fuel ?
Furnace oil
Bagasse
Semi-coke
Kerosene
✅ The correct answer is option B.
375. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
Entrained
Moving
Fixed
Fluidised
✅ The correct answer is option A.
376. Which of the following is not a by-product fuel?
Producer gas
Blast furnace gas
Coke oven gas
Refinery gas
✅ The correct answer is option A.
377. A good metallurgical coke
Should have high porosity
Should be brittle
Must contain moderate quantities of ash, moisture, sulphur and volatile matters
Should have low fusion point of its ash
✅ The correct answer is option A.
378. Steam is intermittently admitted into the fuel bed during the production of producer gas to
Convert CO to CO₂
Increase the combustion rate
Increase the gas production rate
Minimise the chances of clinker formation
✅ The correct answer is option D.
379. The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be
27.6
23
47.3
42.9
✅ The correct answer is option B.
380. The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .
1800
800
4500
10000
✅ The correct answer is option A.