141. The function of an economiser in a boiler is to preheat the
Feedwater
Combustion air
Pulverised coal
Furnace oil
✅ The correct answer is option A.
Furnace Technology MCQs
142. Air filtration in a furnace
Reduces its thermal efficiency
Is indicated by flame sting out
Increases the flue gas temperature
None of these
✅ The correct answer is option A.
143. Which is a regenerative furnace?
Coke oven heating chamber
Open hearth furnace
Both A and B
Neither A nor B
✅ The correct answer is option C.
144. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
Economiser
Regenerator
Ceramic recuperator
Waste heat boiler
✅ The correct answer is option B.
145. The heating capacity of muffle furnace depends on the
Surface area & emissivity of the stock
Properties of the muffle wall (temperature, area, emissivity)
Both A & B
Neither A nor B
✅ The correct answer is option C.
146. Forced recirculation of furnace gases is practised
To increase heat transfer by convection
To ensure uniform temperature
In furnaces, operating below 750°C
All of the above
✅ The correct answer is option D.
147. Which of the following is a batch furnace?
Cupola
Reheating furnace
Glass tank furnace
None of these
✅ The correct answer is option A.
148. Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
Ash disposal problem
Excessive fly ash discharge from the stack
Higher power consumption in its transportation
Erosion of induced draft fan blades
✅ The correct answer is option A.
149. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
Furnace oil with air
Furnace oil with oxygen
Blast furnace gas with air
Blast furnace gas with oxygen
✅ The correct answer is option C.
150. __________ furnace is not an electric furnace.
Arc
Induction
Pot
Resistance
✅ The correct answer is option C.