chemical engineering MCQs – Page 48

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 Review each marked answer and report any item that may be outdated or unclear.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
941. Nusselt number/Biot number varies___________________?
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A. Inversely with the dimension of the solid

B. Directly with thermal conductivity

C. Inversely with thermal conductivity

D. Directly with heat transfer co-efficient

942. Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 C. The purpose of electric current supplied to the furnace is to___________________?
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A. Achieve very high purity of aluminium (99.9%)

B. Keep the electrolyte in liquid condition by the generation of heat

C. Electrolytically dissociate alumina

D. Both B. & C.
943. Optimum economic pipe diameter for fluid is determined by the___________________?
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A. Density of the fluid

B. Viscosity of the fluid

C. Total cost considerations (pumping cost plus fixed cost of the pipe)

D. None of these

944. Dechlorination of treated water is necessary to __________________?
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A. Remove residual turbidity

B. Remove chlorinous taste

C. Reduce the bacterial load on filter

D. Control taste and odour

945. Acrylonitrile is mainly used in the _____________ industry?
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A. Photographic

B. Dyeing

C. Polymer

D. Printing

946. Which of the following is not a component of the working capital for a chemical process plant ?
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A. In-process inventory

B. Product inventory

C. Storage facilities

D. Minimum cash reserve

947. The activity of pure hydrogen gas at 1000C and 5 atm pressure_________________?
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A. Is always greater than 1

B. Depends on the choice of the standard state

C. Can be 5

D. Is always less than 1

948. An investment of Rs. 100 lakhs is to be made for construction of a plant, which will take two years to start production. The annual profit from the operation of the plant is Rs. 20 lakhs. What will be the payback time ?
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A. 5 years

B. 7 years

C. 12 years

D. 10 years

949. Lead is added to 60:40 brass primarily to improve_________________?
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A. Fluidity

B. Corrosion resistance

C. Strength

D. Machinability
950. The inventory of raw materials included in the working capital is usually about ______________ month?s supply of raw materials valued at delivery prices?
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A. Three

B. Twelve

C. Six

D. One
951. Cupola produces _________________ iron?
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A. Wrought

B. Pig

C. Carbon free

D. Cast
952. Manufacturing cost in a chemical company does not include the____________________?
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A. Plant overheads

B. Administrative expenses

C. Direct products cost

D. Fixed charges

953. ____________ taxes are based on gross earnings ?
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A. Income

B. Property

C. Excise

D. Capital gain

954. ______________ the exhaust gas is an indication of the incomplete combustion of fuel?
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A. High temperature of

B. High % of CO in

C. Low temperature of

D. High % of CO2 in

955. ____________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength ?
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A. Shot peening

B. Spinning

C. Slugging

D. Lancing

956. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an___________________?
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A. Stroboscope

B. Rotameter

C. Hot wire anemometer

D. Pitot tube
957. Relative cost of chemical process plants in India is about ______________ percent more than the similar plants in U.S.A ?
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A. 15

B. 35

C. 75

D. 55

958. Gas turbine normally employs a constant _______________ cycle?
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A. Pressure

B. Volume

C. None of these

D. Temperature

959. The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the _____________ point of the material?
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A. Elastic

B. Yielding

C. Breaking

D. Ultimate

960. Shaving soaps are____________________?
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A. Soft potassium soaps (potassium salt of fatty acid) with free Stearic acid to give lather a

B. None of these

C. ting property</strong>

D. Metallic soaps compounded with frothing agents

E. High free alkali soaps having excess of cane sugar and alcohol