2259. Maximum heat transfer in high temperature furnaces is by
Conduction
Convection
Radiation
Either A, B or C; depends on the type of furnace
✅ The correct answer is option C.
2230. Very high pressure boilers are usually __________ boilers.
Fire tube
Water tube
Waste heat
Natural circulation
✅ The correct answer is option D.
2236. Which of the following is not a directly fired furnace?
By-product coke oven
Calcination kiln
Sintering furnace
Open hearth furnace
✅ The correct answer is option A.
2240. Which is not a hearth furnace?
Glass tank furnace
Open hearth furnace
Cupola
Reheating furnace
✅ The correct answer is option C.
2244. Presence of SO₂ in furnace gases attacks the ferrous metal by way of
Accelerating the rate of scaling
Causing metal embrittlement
Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
All of the above
✅ The correct answer is option D.
2249. Artificial draught produced by a fan in the furnace can be controlled by the
Speed of the fan
Damper
Variation in the pitch of fan blades
All of the above
✅ The correct answer is option D.
2255. The heat recoverable from flue gases of furnaces depends on the
Thermal efficiency of furnace
Quantity of flue gases
Flue gas temperature drop through the furnace
All of the above
✅ The correct answer is option D.
2260. The advantages of firing pulverised coal in the furnace lies in the fact that, it
Permits the use of high ash content coal
Permits the use of low fusion point ash coal
Accelerates the burning rate and economises on fuel consumption
All of the above
✅ The correct answer is option C.
2225. Regenerators compared to the recuperators for the same duty
Occupy more space
Are less costly
Are of smaller size
All of the above
✅ The correct answer is option A.
2226. Which of the following is not a recuperative furnace?
Soaking pit
Reheating furnace
Steamboiler
Coke oven
✅ The correct answer is option D.