chemical engineering MCQs – Page 366

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

7301. Maximum consumption of zinc is in____________________?
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A. Electrical industry

B. Utensil manufacture

C. Alloying

D. Galvanising

7302. Heat transfer rate to the charge/stock in a furnace does not depend upon the________________?
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A. Flue gas temperature

B. Emissivity of refractory walls

C. Type of fuels viz. solid, liquid or gaseous

D. Initial temperature of the charged stock

7303. 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. Oxygen enrichment of combustion air

C. Increasing the draft in the furnace

D. Preheating the combustion air

7304. Which one is not an induced draught furnace ?
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A. Blast furnace stove

B. Sintering furnace

C. None of these

D. High pressure boiler

7305. Vessels made of _____________ can be used to store dry chlorine?
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A. Thermoplastic materials

B. None of these

C. Steel or iron

D. Nickel

7306. Pick out the correct statement?
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A. In laminar flow, Newtons law of viscosity does not apply

B. A forced vortex occurs when fluid rotates as a solid about an axis

C. A free vortex occurs, when fluid rotates as a solid

D. In turbulent flow, there are neither cross-currents nor eddies

7307. 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.

7308. Which of the following is a directly fired intermittent furnace ?
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A. Reverberatory furnace

B. Walking beam reheating furnace

C. Tunnel kiln

D. Tower furnace

7309. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?
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A. 15-Oct

B. 25-30

C. 45-50

D. 65-70

7310. Forced recirculation of furnace gases is practised_______________?
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A. In furnaces, operating below 750C

B. To increase heat transfer by convection

C. All A., B. and C.

D. To ensure uniform temperature

7311. Ceramic recuperators are generally made of_________________?
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A. Calcium carbide

B. Silicon carbide

C. High alumina bricks

D. Fireclay bricks

7312. Lead is_____________________?
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A. Used as a cathodic material

B. Not resistant to corrosion

C. scraper buildings</strong>

D. Used as a shock absorber (in mattress form) between the foundation and steel framework of

E. Not used as pigment (in its compound forms) for paints

7313. Cement Kiln is a___________________?
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A. Natural draft furnace

B. Batch furnace

C. Rotary Kiln

D. Tunnel Kiln

7314. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?
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A. Preheating the fuel gas

B. All A., B. & C.

C. Oxygen enrichment of combustion air

D. Preheating the combustion air

7315. High degree of toughness is a must for__________________?
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A. None of these

B. Cold work tool steel

C. Shock resisting steel

D. High speed steel

7316. Presence of nickel in steel improves its_________________?
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A. Cutting ability

B. All A., B. and C.

C. Corrosion resistance

D. Wear resistance

7317. Nickel made/clad equipments are suitable for handling________________?
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A. Ammonia (both aqueous & anhydrous)

B. Fruit juices, milk & its products and caustic soda solution

C. Nitric acid & hydrochloric acid (concentrated)

D. Sulphuric acid (concentrated)

7318. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?
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A. None of these

B. Arc

C. Low frequency induction

D. Resistance

7319. Which is not accomplished in an underfired furnace ?
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A. Elimination of cold spot at the bottom of the charge

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

C. Reduction in the temperature of furnace gases

D. Increase in heating capacity/m2 of floor space

7320. 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

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