chemical engineering MCQs – Page 49

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 Review each marked answer and report any item that may be outdated or unclear.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
961. Electrochemical corrosion can occur, only if ________________ is present in contact with metal?
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A. Oxygen

B. Gaseous medium

C. Liquid medium

D. Air

962. Chemical engineering plant cost index is used for finding the present cost of a particular chemical plant, if the cost of similar plant at some time in the past is known. The present cost of the plant = original cost (index value at present/ index value at time original cost was obtained). The most major component of this cost index is____________________?
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A. Electrical equipments and material

B. Pumps and compressor

C. Fabricated equipment and machinery

D. Process instruments and control

963. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be________________?
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A. 18.5 : 1

B. 9.5 : 1

C. 12.5 : 1

D. 15.5 : 1

964. The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be________________?
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A. 5000Pa

B. 1.01 105Pa

C. 3567Pa

D. 3171Pa

965. The atmospheric temperature during melting of ice/snow (in the atmosphere)_________________?
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A. May increase or decrease; depends on the altitude where snow melts

B. Remain same

C. Increases

D. Decreases
966. Heat transfer by ______________ is almost absent in case of fluidised bed drying operation?
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A. Radiation

B. Conduction

C. Convection

D. Both B. & C.

967. Pick out the wrong statement about nucleate boiling ?
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A. The temperature is less than that of film boiling

B. Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface

C. Heat transfer from the surface of the liquid is less than that in film boiling

D. Surface temperature is greater than the saturation temperature of the liquid

968. On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________?
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A. Toughness

B. Creep

C. Tensile strength

D. Fatigue

969. Often earing defects are found during deep drawing operation, because the __________________?
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A. Starting sheet has planer anisotropy due to its texture

B. Starting sheet has normal anisotropy due to its texture

C. Surface finish of the sheet is poor

D. Sheet material has been given substantial spring back

970. Cost of piping in a fluid processing unit (e.g., distillation) of a chemical process plant is about _____________ percent of the fixed capital investment ?
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A. 34

B. 13

C. 22

D. 4

971. Regeneration of molecular sieve requires it to be heated to a temperature of about __________________ C?
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A. 80-120

B. 600-800

C. 200-300

D. 1000-1100
972. A series of equal payments (e.g., deposit or cost) made at equal intervals of time is known as __________________?
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A. Future worth

B. Annuity

C. Perpetuity

D. Capital charge factor

973. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and ___________________?
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A. Manganese

B. Nickel

C. Chromium

D. Silicon

974. For a given fluid, as the pipe diameter increases, the pumping cost ______________________?
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A. Decreases

B. May increase or decrease, depending upon whether the fluid is Newtonian or non-Newtonian

C. Increases

D. Remains the same

975. Increase in temperature, in general results in the____________________?
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A. Decrease in the viscosities of both liquids & gases

B. Increase in the viscosities of both liquids & gases

C. Increase in the viscosity of liquids and decrease in that of gases

D. Decrease in the viscosity of liquids and increase in that of gases
976. In case of a, centrifugal pump, the ratio h1/h2 is termed as the _____________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller)?
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A. Mechanical

B. Volumetric

C. Overall

D. Impeller

977. Styrene (a monomer for the production of polystyrene) is commercially produced by ____________________?
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A. Dehydration of ethyl alcohol followed by hydrogenation

B. Reacting ethylene oxide with acetaldehyde

C. Catalytic dehydrogenation of ethyl benzene

D. Fermentation of starch

978. Economics of Solvay Process depends upon the efficiency of __________________?
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A. Ammonia recovery

B. Carbonating tower

C. Ammonia recovery and size of the plant

D. Ammoniation of salt solution

979. Ammonia gas can be dried by___________________?
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A. Quick lime

B. CaCl2

C. PCl5

D. Concentrated H2SO4

980. Following the six-tenth factor rule, if a log-log plot of capacity of the equipment vs. cost of the equipment is made, then a straight line is obtained, whose slope is equal to_________________?
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A. 0.6

B. 0.2

C. 0.1

D. 0.8