chemical engineering furnace technology MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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
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