chemical engineering MCQs – Page 174

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 Review each marked answer and report any item that may be outdated or unclear.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
3461. Crude oil produced by Indian oil fields are predominantly _______________ in nature?
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A. Mixed base

B. Naphthenic

C. Paraffinic

D. Asphaltic
3462. The minimum baffle height should be ______________?
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A. Equal to the impeller diameter

B. Twice the impeller diameter

C. 3/4 of the tank height

D. Twice the tank diameter

3463. Which of the following has the highest viscosity of all (at a given temperature) ?
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A. Light diesel oil

B. Fuel oil

C. Naphtha

D. Petrol

3464. Which of the following is an additive used for improving the cetane number of diesel ?
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A. None of these

B. Tetramethyllead

C. Ethyl nitrate or acetone

D. Tetraethyl lead
3465. In a distillation column, bubble caps are located on trays with a pitch of ______________ times the outside diameter of the caps?
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A. 1.6 to 2

B. 1.5 to 3

C. 1.3 to 2

D. 2.5

3466. Aromatics have the highest ________________ of all the hydrocarbons of same carbon atoms?
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A. Viscosity

B. Smoke point

C. Octane number

D. Cetane number

3467. Carbon/hydrogen ratio (by weight) is maximum (out of following) for_________________?
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A. Kerosene

B. Gasoline

C. Heavy fuel oil

D. Light gas oil

3468. An upper limit of oil content is limited to about ______________ percent for achieving efficient and satisfactory level of wax sweating?
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A. 40

B. 5

C. 60

D. 15

3469. In Hydrofining catalytic desulphurisation process for sweetening of petroleum products, use of hydrogen_________________?
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A. Enhances the desulphurisation process

B. Minimises coke formation

C. Both A. and B.

D. Neither A. nor B.

3470. Feedstock for polymerisation is__________________?
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A. Low boiling aromatics

B. Cracked gases rich in C2 & C4 olefins

C. Naphtha

D. None of these

3471. Fuel oil is subjected to visbreaking to reduce its_______________?
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A. All A., B. and C.

B. Pressure drop on pumping

C. Pour point

D. Viscosity

3472. Pick out the wrong statement?
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A. The discharge end of the downcomer must project far enough into the tray liquid so that no

B. If sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in

C. bubbles can enter the open end and by pass the bubble caps

D. The liquid head in the downcomer should not be greater than one half the plate spacing to

E. id flooding

F. None of these
3473. Name the endothermic reaction out of the following ?
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A. Hydrocracking

B. Catalytic polymerisation

C. Dehydrogeneration of Naphthene to produce aromatic

D. Catalytic cracking

3474. Water separometer index (modified) (WSIM) of a petrofuel is the measure of its____________________?
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A. Water separation characteristics

B. Water content

C. Water absorbing capacity from atmosphere

D. Emulsification tendency

3475. For gasoline, the flash point (<50C) is determined by the______________________?
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A. Saybolt chromometer

B. Abel apparatus

C. Pensky-Martens apparatus

D. None of these
3476. Mercaptans are added to liquefied petroleum gas (LPG) to _____________________ ?
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A. Increase its calorific value

B. Narrow down its explosion limit

C. Assist in checking its leakage from cylinder

D. Reduce its cost

3477. Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about ________________ mm Hg absolute?
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A. 1 to 5

B. 250 to 350

C. 450 to 500

D. 30 to 80
3478. The colour of gasoline is an indication of its _________________?
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A. Gum forming tendency & thoroughness of refining

B. None of these

C. Lead susceptibility

D. Octane number

3479. Catalyst used in catalytic polymerisation which produces polymer gasoline is_________________?
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A. H2SO4

B. H3PO4

C. Both A. and B.

D. AlCl3

3480. In petroleum refining, the process used for conversion of hydrocarbons to aromatics is________________?
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A. Alkylation

B. Hydrotreating

C. Catalytic cracking

D. Catalytic reforming