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chemical engineering furnace technology MCQs

Practise multiple-choice questions from chemical engineering furnace technology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering furnace technology Mcqs
1. Rate of heat release in a furnace, which is the measure of heat intensity, is defined as_________________?
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A. kcal/m3 combustion space

B. kcal/hr/m3 combustion space

C. None of these

D. kcal/hr

2. _____________ atmosphere is maintained inside an iron blast furnace?
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A. Reducing

B. Inert

C. Decarburising

D. Oxidising

3. Ostwald charts are meant for__________________?
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A. Computation of flue gas analysis

B. Computing the excess/deficiency of combustion air

C. None of these

D. Calculation of flue gas temperature

4. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?
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A. 99

B. 50

C. 85

D. 65

5. An example of shaft furnace is the__________________?
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A. Soaking pit

B. L.D. converter

C. Blast furnace

D. Glass melting tank

6. Coke ovens in steel plant are heated by____________________?
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A. Electricity

B. Blast furnace gas/mixed gas

C. Coke oven gas

D. Both B. and C.
7. While the fuel fired furnace can be used upto a maximum temperature of about 1700C, the electric furnace can be used upto a temperature of about _____________ C?
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A. 6000

B. 4500

C. 2000

D. 3000

8. Large tonnage of refractory bricks are dried in a_____________________?
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A. Shaft furnace

B. Rotary hearth furnace

C. Tunnel kiln

D. Muffle furnace

9. Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?
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A. Dust concentration & nature of dust in waste gas

B. All A., B. and C.

C. Quantity & temperature of waste gas

D. Corrosive nature of the waste gas

10. An example of recuperative furnace is the__________________?
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A. Open hearth furnace

B. None of these

C. Soaking pit

D. Coke ovens

11. Presence of SO2 in furnace gases attacks the ferrous metal by way of_________________?
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A. All A., B. and C.

B. Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at

C. Accelerating the rate of scaling

D. Causing metal embrittlement

E. h temperature

12. Regenerators as compared to recuperators for the same duty_________________?
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A. Store smaller quantity of waste heat

B. Involve higher initial cost

C. All A., B. & C.

D. Are lighter & compact

13. The main function of a muffle in the muffle furnace is to__________________?
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A. Protect the charge from the effects of the products of combustion

B. Smooth out temperature inequalities on the combustion side of the muffle wall

C. Both A. & B.

D. Neither A. nor B.

14. Soaking pits are meant for heating steel_________________?
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A. Sheets

B. Slabs

C. Ingots

D. Coils

15. Shaft furnaces are used for_______________________?
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A. Calcining

B. All A., B. and C.

C. Smelting

D. Roasting

16. In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
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A. Less of excess air

B. More of CO2 in flue gas

C. More of excess air

D. More of CO in flue gas

17. Which one is not an induced draught furnace ?
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A. None of these

B. Sintering furnace

C. High pressure boiler

D. Blast furnace stove
18. Means for giving direction to the circulation of gases in furnaces are_____________________?
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A. All A., B. and C.

B. Location of outlet ports and heating & combustion devices

C. Fans

D. Arrangement of heating stock in the furnaces

19. Regenerators are installed in_______________?
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A. Coke ovens

B. Open hearth furnace

C. Both A. & B.

D. Neither A. nor B.

20. An example of indirectly heated furnace is the_________________?
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A. Reheating furnace

B. None of these

C. Muffle furnace

D. Soaking pit

21. Which of the following variables does not affect the furnace capacity ?
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A. Gas velocity in furnace

B. Size of the furnace

C. None of these

D. Ratio of wall surface to surface of stock

22. Decarburisation of steel__________________?
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A. Is favoured by CO2

B. Is the removal of carbon from iron carbide (Fe3C)

C. All A., B. and C.

D. Affects its crystalline structure

23. Combustion of fuel in a furnace with oxygen enriched air results in higher__________________?
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A. Flue gas volume

B. Fuel consumption

C. Stack loss

D. Flame temperature
24. Ingress of cold air in the furnaces through cracks, charging doors, openings etc ________________?
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A. Increases the load on the induced draft fan

B. All A., B. and C.

C. Reduces the furnace draught

D. Reduces the flue gas temperature and makes the furnace atmosphere oxidising

25. In low or standard frequency induction furnace, heat is produced by the_______________________?
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A. Induction and resistance

B. None of these

C. Combination of induced current and skin effect

D. Current flow through a heating element

26. Which is not a hearth furnace ?
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A. Open hearth furnace

B. Cupola

C. Reheating furnace

D. Glass tank furnace

27. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
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A. Excessive fly ash discharge from the stack

B. Higher power consumption in its transportation

C. Erosion of induced draft fan blades

D. Ash disposal problem
28. Furnace aerodynamics is related to the _____________ in the furnace?
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A. Movement of gases

B. Temperature control

C. Measurement of flue gas volume

D. Pressure adjustment

29. The heating capacity of muffle furnace depends on the_________________?
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A. Surface area & emissivity of the stock

B. Properties of the muffle wall (temperature, area, and emissivity)

C. Both A. & B.

D. Neither A. nor B.

30. Reheating furnace (pusher type) is used for heating_____________________?
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A. Slabs

B. Steel sheets

C. Ingots

D. Steel coils

31. Rotary kilns are used in the____________________?
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A. Calcination of limestone & dolomite

B. Cement manufacture

C. Both A. and B.

D. Neither A. nor B.

32. The amount of combustible escaping unconsumed from the furnace, depends upon the________________?
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A. Burner design (thoroughness of mixing versus stratification)

B. nge of direction)

C. Air supplied and furnace temperature

D. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by

E. All A., B. and C.
33. Ceramic recuperators compared to metallic recuperators for the same duty_________________?
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A. Have higher pressure differential between flue gas & air side

B. Are lighter

C. Are less costly

D. Occupy more space
34. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?
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A. Waste heat boiler

B. Ceramic recuperator

C. Economiser

D. Regenerator
35. Overfire burning in a furnace is a phenomenon characterised by____________________?
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A. Supply of excess fuel

B. Supply of excess air

C. None of these

D. e air</strong>

E. Burning carbon monoxide and other incombustible in upper zone of furnace by supplying
36. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600C, the percentage stack loss will be maximum in case of complete combustion of_________________?
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A. Blast furnace gas with oxygen

B. Blast furnace gas with air

C. Furnace oil with oxygen

D. Furnace oil with air

37. An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?
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A. Shaft

B. Tunnel

C. Rotary hearth

D. Walking beam
38. Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________?
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A. Preheating the fuel gas

B. Preheating the combustion air

C. Oxygen enrichment of combustion air

D. Increasing the draft in the furnace
39. Pot furnace which is either regenerative or recuperative, is used in the manufacture of____________________?
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A. Refractory bricks

B. Stainless steel

C. Glass

D. Potteries

40. Fuel used in B.F. stove is______________________?
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A. Pulverised coal

B. Coke oven gas

C. Furnace oil

D. Blast furnace gas/mixed gas
41. Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the__________________?
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A. Physical nature, ash content and fineness of the coal

B. Amount of excess air supplied and load on the boiler

C. All A., B. and C.

D. Type of burner and combustion chamber

42. Protective gas used in the annealing furnace for steel coil comprises of__________________?
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A. 5% H2 + 9% N2

B. 95% N2 + 5% H2

C. 100% H2

D. 100% CO

43. Reverberatory furnace is used for_____________________?
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A. Steel melting

B. Roasting/reduction of ores

C. Annealing steel coil

D. Heating air

44. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of__________________?
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A. Low emissivity

B. High thermal conductivity

C. Both A. and B.

D. Neither A. nor B.

45. Which of the following is a periodic furnace ?
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A. Tunnel kiln

B. Reheating furnace

C. Rotary kiln

D. Soaking pit
46. Specific heating capacity of a furnace is expressed as_____________________?
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A. Weight heated/hr

B. Weight heated/hr/furnace volume

C. Weight heated/furnace volume

D. None of these

47. Main gas valve in a gaseous fuel burner is a ______________ valve?
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A. None of these

B. Butterfly

C. Gate

D. Globe

48. Regenerators compared to the recuperators for the same duty__________________?
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A. Occupy more space

B. Are of smaller size

C. All A., B. and C.

D. Are less costly

49. To reduce the stack loss, heat recovery from flue gas can be done by_____________________?
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A. Preheating of combustion air

B. All A., B. and C.

C. Preheating of cold stock

D. Steam generation in waste heat boilers

50. In a furnace operation, which is not preheated ?
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A. Solid fuels

B. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

C. Both A. and B.

D. Neither A. nor B.