chemical engineering furnace technology MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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

81. Size of the combustion chamber of a furnace depends upon the ___________________?
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A. Preheat temperature of fuel & air

B. Method of mixing the fuel & air

C. Heat release rate of the fuel

D. All A., B. and C.

82. Which furnace employs preheating, heating and soaking zones ?
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A. Open hearth furnace

B. Soaking pit

C. Cupola

D. Reheating furnace

83. Reducing atmosphere is maintained in a__________________?
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A. Calcination kiln

B. L.D. converter

C. Blast furnace

D. Soaking pit

84. If fuel and air are mixed ahead of the burner, it is called a/an ______________ burner?
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A. Diffusion

B. Rotary

C. Outside mixing type

D. Premix

85. Which is not accomplished in an underfired furnace ?
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A. Increase in heating capacity/m2 of floor space

B. Protection of the periphery of the charge from excessive radiation

C. Elimination of cold spot at the bottom of the charge

D. Reduction in the temperature of furnace gases

86. Pulverised fuel fired furnaces employ ______________ fuel firing?
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A. Horizontal

B. Vertical

C. All A., B. and C.

D. Tangential

87. Which of the following is a heat treatment furnace ?
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A. Muffle furnace

B. Annealing furnace

C. Rotary kiln

D. Reheating furnace

88. Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?
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A. Combustion air not enriched with oxygen

B. Stoichiometric combustion air

C. Recuperators

D. Non-preheated combustion air

89. In salt bath furnace, heat is transferred to the charge mainly by __________________?
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A. Conduction

B. None of these

C. Radiation

D. Convection

90. Which of the following furnaces will have maximum thermal efficiency ?
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A. Walking beam reheating furnace

B. Soaking pits

C. Rotary kilns

D. Boiler furnace

91. In furnaces operating at very high temperature (say) 1250C, e.g. soaking pit), the maximum heat transfer takes place by__________________?
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A. Radiation

B. Cannot be predicted

C. Convection

D. Conduction

92. Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?
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A. Beehive coke oven

B. High pressure boiler

C. Blast furnace stoves

D. Coke oven

93. Fuel economy in furnaces can be achieved by_________________?
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A. Using oxygen enriched combustion air

B. Reducing the heat loss through furnace openings & doors

C. All A., B. and C.

D. Preheating the combustion air

94. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ C?
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A. 850

B. 250

C. 1000

D. 650

95. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ C, because corrosion prevails at higher temperatures?
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A. 1250

B. 1050

C. 350

D. 750

96. Cement Kiln is a___________________?
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A. Batch furnace

B. Tunnel Kiln

C. Natural draft furnace

D. Rotary Kiln

97. Which of the following variables affects the furnace capacity ?
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A. Thickness of heating stock

B. All A., B. and C.

C. Thermal conductivity of stock

D. Temperature of flue gas

98. Example of an indirectly heated furnace is__________________?
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A. Hood annealing furnace

B. Muffle furnace

C. Both A. and B.

D. Neither A. nor B.

99. Maximum thermal efficiency of boiler may be about _____________ percent?
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A. 90

B. 65

C. 10

D. 25

100. The resistance furnace produces heat by the__________________?
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A. Electric arc struck between electrodes and the charge

B. Combination of induced current and skin effect

C. None of these

D. Flow of current through a heating element

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