chemical engineering Mcqs
3101. Which of the following chemical reactions will be favoured by low pressure ?
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A. None of these

B. N2 + O2 ? 2NO

C. 2HI ? H2 + I2

D. N2O2 ? 2NO2
3102. Which of the following is a Naphthene ?
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A. Butene

B. Acetylene

C. Butadiene

D. Cyclohexane
3103. Reverse reaction in a chemical equilibrium is favoured by the________________?
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A. Increase in the concentration of one of the products

B. Removal of one of the products regularly

C. Increase in the concentration of one of the reactants

D. None of these

3104. Octane number (unleaded) of gasoline produced by isomerisation of butane may be about __________________?
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A. 70

B. 90

C. 55

D. 45

3105. If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chateliers principle)?
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A. Increases

B. Changes unpredictably

C. Remains unaltered

D. Decreases
3106. The role of a catalyst in a chemical reaction is to change the__________________?
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A. Equilibrium constant

B. Heat of reaction

C. Activation energy

D. Final products

3107. The fractional volume change of the system for the isothermal gas phase reaction, A ? 3B, between no conversion and complete conversion is___________________?
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A. 3

B. 0.5

C. 1

D. 2
3108. Butadiene is a/an_________________?
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A. Aromatic

B. Olefin

C. Di-olefin

D. Naphthene

3109. The performance of a cascade of CSTRs can be improved by adding__________________?
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A. More CSTRs in series

B. A P.F. reactor in series

C. A P.F. reactor in parallel

D. More CSTRs in parallel

3110. For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a _________________ reactor?
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A. Tubular flow

B. Stirred tank

C. Fixed bed

D. Batch

3111. Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?
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A. Three

B. One

C. Zero

D. Two

3112. . In the converter of the contact process for the manufacture of H2SO4 the equilibrium conversion of SO2__________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO2 to air?
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A. (i) increases (ii) increases

B. (i) decreases (ii) increases

C. (i) increases (ii) decreases

D. (i) decreases (ii) decreases

3113. Molecular weight of crude petroleum may be around________________?
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A. 50

B. 1500

C. 5000

D. 250

3114. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will________________?
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A. Remain the same

B. Also be doubled

C. Become one fourth

D. Be halved

3115. Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about _______________ C ?
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A. 50

B. 70

C. 90

D. 140

3116. The rate of the heterogeneous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction is_______________?
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A. Surface reaction between absorbed A and absorbed B

B. Surface reaction between A in the gas phase and absorbed B

C. Absorption of A

D. Surface reaction between absorbed A and B in the gas phase
3117. The excess energy of the reactants required to dissociate into products is known as the ________________ energy?
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A. Threshold

B. Thermal

C. Activation

D. Binding

3118. Transition state theory gives the rate constant as__________________?
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A. K ? T . e-E/RT

B. K ? e-E/RT

C. K ? eE/RT

D. K ? ?T . e-E/RT

3119. In a chemical reaction, _____________________ are conserved?
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A. Ions

B. Masses

C. Atoms

D. Both B. & C.
3120. In catalytic cracking, the___________________?
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A. Gasoline obtained has a very low octane number

B. Pressure & temperature is very high

C. Gasoline obtained has very high amount of gum forming compounds

D. Gasoline obtained has very high aromatic content
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

3141. Most commonly used crude heater before the fractionation tower in a refinery is the ______________ heater?
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A. Electric immersion

B. Pipestill

C. None of these

D. Steam coil

3142. What is the dispersion number for a plug flow reactor ?
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A. -1

B. 0

C. ?

D. 1

3143. For a vapour phase catalytic reaction (A + B ? P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?
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A. -rA = (k . PA

B. #8211; k1PP)/(1 + KAPA + KPPP)

C. -rA = (k . PA . PB)/(1 + KAPB + KBPB . KPPP)

D. -rA = (k . PA . PB)/(1 + KAPA)

E. -rA = (k . PA . PB)/(1 + KAPA + KPPP)
3144. For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the ______________ adsorption?
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A. Physical

B. Chemical

C. Both A. and B.

D. Neither A. nor B.

3145. Which of the following has the highest flash point of all ?
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A. Petrol

B. Furnace oil

C. Diesel

D. Kerosene

3146. Which of the following fractions of petroleum contains maximum sulphur ?
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A. Gasoline

B. Atmospheric residue

C. Naphtha

D. Diesel

3147. Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?
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A. 1/4

B. 2

C. 2-Jan

D. 4

3148. Ionic reactions occur in____________________?
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A. Any state

B. Liquid state only

C. Solid state only

D. Solutions
3149. The most widely used crude topping column in refineries is the ______________ column?
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A. Bubble-cap

B. Fluidised bed

C. Perforated plate

D. Packed bed

3150. Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene ?
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A. Smoking tendency of aromatics decreases with increase in its molecular weight

B. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on

C. Smoking tendency of hydrocarbons increases in the order: paraffins ? isoparaffins ?

D. ition of double bond

E. hthenes ? aromatics

F. Smoking tendency of paraffins increases with decrease in its molecular weight