Furnace Technology

About this subject

Furnace Technology

Practice questions

Showing page 1 of 7. Select an option to practise inline.

Open full list →

Show Answers

Correct options are highlighted when revealed.

1.Identify the incorrect statement from the following options:

Introducing methane into the furnace atmosphere lowers hydrogen-induced decarburization.Nitrogen combined with steam causes decarburization of high carbon steel, while hydrocarbon gases carburize steel surfaces during annealing.Active nitrogen, produced by ammonia cracking on the metal surface, leads to nitride formation.None of the above statements are incorrect.

2.What is the primary purpose of Ostwald charts?

Determining the surplus or shortage of combustion airEstimating the temperature of flue gasesAnalyzing the composition of flue gasesNone of the above

3.Among the following types of furnaces, which one achieves the highest thermal efficiency?

Soaking pitsWalking beam reheating furnaceBoiler furnaceRotary kilns

4.What does the economiser in a boiler primarily preheat?

The feedwaterThe air used for combustionThe pulverized coalThe furnace oil

5.Which of the following substances is not used as an additive to flue gases from a furnace to lower their dew point?

AmmoniaPowdered dolomiteAlkaline compoundsNone of the above

6.Among the following fuels burned in a furnace with flue gas temperature at 600°C, which one results in the highest percentage of stack loss during complete combustion?

Furnace oil combusted with airFurnace oil burned using pure oxygenBlast furnace gas burned with airBlast furnace gas burned using pure oxygen

7.Which of the following methods does NOT contribute to improving fuel efficiency in an industrial furnace?

Using stoichiometric amounts of combustion airEmploying combustion air that is not preheatedUtilizing combustion air without oxygen enrichmentInstalling recuperators to recover heatApplying excess combustion air

8.Which type of furnace is designed with distinct preheating, heating, and soaking sections?

9.In which type of furnace are regenerators typically installed?

Glass melting furnaceOpen hearth furnaceBy-product coke ovensAll of the above

10.What defines the phenomenon of overfire burning in a furnace?

Providing more fuel than requiredIntroducing an excess amount of airCombustion of carbon monoxide and other unburned gases in the upper furnace area by adding additional airNone of the above

11.Which of the following is classified as a continuous furnace?

Furnaces used for producing cokeFurnaces designed for annealing processesFurnace with a glass tank operating continuouslyNo furnace fits this category

12.What does the turndown ratio of a burner indicate about the furnace operation?

The range of fuel firing ratesThe size of the combustion chamberOnly the highest heat input capacityOnly the lowest heat input capacity

13.In which type of furnace is a refractory barrier placed between the material being heated and the heat source?

Updraft kilnMuffle furnaceContinuous furnaceNone of the above

14.Which type of kiln is commonly used to dry large quantities of refractory bricks?

15.What is the primary challenge that limits the prolonged use of pulverized coal in boiler combustion?

Difficulties related to ash disposalLarge amounts of fly ash released through the chimneyIncreased energy required for transporting the coalWear and tear of induced draft fan blades due to erosionNone of the above

16.What type of furnace is characterized by the flame originating beneath the hearth and then rising into the heating chamber?

20.At what maximum hot flue gas temperature are metallic recuperators unsuitable for waste heat recovery due to corrosion risks?

How to prepare with Furnace Technology MCQs

Work through questions topic by topic, then revisit any you answered incorrectly.
Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
Pair subject practice with past papers to see how Furnace Technology appears in real exam conditions.

Furnace Technology

About this subject

Practice questions

1.Identify the incorrect statement from the following options:

2.What is the primary purpose of Ostwald charts?

3.Among the following types of furnaces, which one achieves the highest thermal efficiency?

4.What does the economiser in a boiler primarily preheat?

5.Which of the following substances is not used as an additive to flue gases from a furnace to lower their dew point?

6.Among the following fuels burned in a furnace with flue gas temperature at 600°C, which one results in the highest percentage of stack loss during complete combustion?

7.Which of the following methods does NOT contribute to improving fuel efficiency in an industrial furnace?

8.Which type of furnace is designed with distinct preheating, heating, and soaking sections?

9.In which type of furnace are regenerators typically installed?

10.What defines the phenomenon of overfire burning in a furnace?

11.Which of the following is classified as a continuous furnace?

12.What does the turndown ratio of a burner indicate about the furnace operation?

13.In which type of furnace is a refractory barrier placed between the material being heated and the heat source?

14.Which type of kiln is commonly used to dry large quantities of refractory bricks?

15.What is the primary challenge that limits the prolonged use of pulverized coal in boiler combustion?

16.What type of furnace is characterized by the flame originating beneath the hearth and then rising into the heating chamber?

17.What type of atmosphere is sustained within an iron blast furnace?

18.Which diagram is used to represent the heat balance within a furnace?

19.In a reverberatory furnace, what is the primary method by which the charge is heated?

20.At what maximum hot flue gas temperature are metallic recuperators unsuitable for waste heat recovery due to corrosion risks?

How to prepare with Furnace Technology MCQs

More on PakQuizHub