Chemical Engineering MCQs

6108 MCQs  (Page 497 of 611)

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Which is the most thermally efficient furnace _______________________?
A. Reheating furnace
B. Reverberatory furnace
C. Rotary kilns
D. Boiler furnace
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The advantages of firing pulverised coal in the furnace lies in the fact that, it_____________________?
A. Permits the use of high ash content coal
B. Permits the use of low fusion point ash coal
C. Accelerates the burning rate and economises on fuel consumption
D. All a., b. and c.
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_____________ furnace is not an electric furnace?
A. Arc
B. Induction
C. Pot
D. Resistance
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To reduce the stack loss, heat recovery from flue gas can be done by_____________________?
A. Preheating of cold stock
B. Preheating of combustion air
C. Steam generation in waste heat boilers
D. All a., b. and c.
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Size of the combustion chamber of a furnace depends upon the ___________________?
A. Heat release rate of the fuel
B. Preheat temperature of fuel & air
C. Method of mixing the fuel & air
D. All a., b. and c.
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An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?
A. Resistance
B. Arc
C. Low frequency induction
D. None of these
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Which of the following is a heat treatment furnace ?
A. Muffle furnace
B. Annealing furnace
C. Reheating furnace
D. Rotary kiln
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In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?
A. Use of non-preheated combustion air
B. Use of pulverised solid fuels
C. Imperfect mixing of fuel & air and infiltration of air
D. Use of excessive positive draft in the furnace
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Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?
A. 350
B. 750
C. 1050
D. 1250
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In reverberatory furnace, charge is heated mainly by__________________?
A. Conduction
B. Natural convection
C. Radiation of heat from the roof of the combustion chamber
D. None of these
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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