chemical engineering MCQs – Page 157

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 Review each marked answer and report any item that may be outdated or unclear.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
3121. Sulphuric acid is used as a catalyst in the_______________?
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A. Gas phase oxidation of SO2 in chamber process

B. None of these

C. Hydrogenation of oils

D. Alkylation of hydrocarbons
3122. For a zero order chemical reaction, the__________________?
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A. All A., B. and C.

B. Plot of products concentration with time is a straight line through the origin

C. Products concentration increases linearly with time

D. Half life period is directly proportion to the initial concentration of the reactants

3123. Rate determining step in a reaction consisting of a number of steps in series is the ______________ step?
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A. Intermediate

B. Fastest

C. Data insufficient; cant be predicted

D. Slowest
3124. Liquefied Petroleum Gas (LPG) is mainly a mixture of _____________________?
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A. Methane & ethane

B. High boiling naphthenes

C. Propane & butane

D. High boiling olefins

3125. Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl isobutyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent has the advantages of the____________________?
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A. Elimination of solvent drying facility

B. Higher nitration temperature

C. All A., B. & C.

D. Lower solvent dilution ratio

3126. Catalyst used in alkylation process is__________________?
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A. Nickel

B. Alumina

C. Silica gel

D. Sulphuric acid
3127. Which of the following factors control the deactivation of a porous catalyst pellet?
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A. All A., B. and C.

B. Decay reactions

C. Pore diffusion

D. Form of surface attack by poison

3128. In case of physical adsorption, the heat of adsorption is of the order of _____________ kcal/kg mole?
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A. 100000

B. 1000

C. 10000

D. 100

3129. Higher vapour pressure of gasoline indicates _________________?
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A. Low flash point

B. High breathing loss

C. Both A. and B.

D. Neither A. nor B.
3130. Which of the following has the lowest cetane number ?
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A. Aromatics

B. i-paraffins

C. Olefins

D. Naphthene

3131. The rate of a chemical reaction is almost doubled for every 10C rise in temperature. The rate will increase ______________ times, if the temperature rises from 10 to 100C?
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A. 112

B. 256

C. 612

D. 512
3132. _____________ chloride present in crude petroleum as impurity is the most prolific producer of HCl during distillation?
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A. Sodium

B. Potassium

C. Magnesium

D. Calcium

3133. In case of a/an ______________ chemical reaction, conversion increases with the rise in temperature?
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A. Reversible endothermic

B. Reversible exothermic

C. Irreversible exothermic

D. Irreversible endothermic

3134. Solvent naphtha used mostly as a solvent in paints and perfumery is produced by the _________________ of virgin naphtha into small boiling range cuts?
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A. Distillation

B. Desulphurisation

C. Steam reforming

D. None of these

3135. Cetane number of alpha methyl naphthalene is assumed to be_________________?
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A. 0

B. 50

C. ?

D. 100

3136. A trickle bed reactor is the one, which_________________?
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A. Has altogether three streams either entering or leaving

B. Employs all the three phases (i.e. solid, liquid and gas)

C. Processes three reactants at different flow rates

D. Processes three reactants with same flow rate

3137. Signal normally used to study non-ideal flow by stimulus response technique is _______________ input?
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A. Pulse

B. Step

C. Both A. & B.

D. Neither A. nor B.

3138. When a catalyst increases the rate of forward reaction, the value of rate constant__________________?
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A. Becomes infinite

B. Increases

C. Decreases

D. Remain same

3139. Which is almost absent in crude petroleum ?
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A. Naphthenes

B. Cycloparaffins

C. Olefins

D. Mercaptans
3140. Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about _______________ mm Hg (absolute)?
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A. 350-400

B. 30-80

C. 150-250

D. 10-May