chemical engineering furnace technology MCQs – Page 3

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 Review each marked answer and report any item that may be outdated or unclear.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

51. Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?
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A. Use of waste heat recovery equipments

B. Emissivity of the refractory walls

C. Thickness of the stock

D. Size of the furnace

52. 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.

53. Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?
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A. Increase in flame temperature

B. Increase in calorific value of the fuel

C. Saving in fuel consumption

D. Reduction in scale losses

54. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about ____________ percent?
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A. 85

B. 15

C. 40

D. 70

55. Regenerators are used for waste heat recovery in____________________?
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A. Soaking pits

B. By-product coke ovens

C. Beehive coke oven

D. Blast furnace stoves

56. An example of a periodic furnace is the__________________?
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A. Coke oven heating chamber

B. Rotary kilns

C. Blast furnace stoves

D. Blast furnace

57. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ C?
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A. 130

B. 250

C. 80

D. 180

58. Neutral atmosphere is maintained in a/an ____________ furnace?
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A. Soaking pit

B. Cold rolled steel coil annealing

C. Open hearth

D. Walking beam reheating

59. The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
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A. Resistance

B. Arc

C. Low frequency induction

D. High frequency induction
60. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about _____________ percent?
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A. 20

B. 60

C. 80

D. 40