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1) For series reaction, the relative yield__________________? a. Is always greater for plug-flow reactor than for the single CSTR of the same volume b. Statement in A. is wrong c. Decreases with increasing conversion d. Both A. and C. hold good
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2) The rate of a homogeneous reaction is a function of__________________? a. Temperature and pressure only b. Temperature and composition only c. Pressure and composition only d. All temperature, pressure and composition
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3) The rate of the reaction, X → Y, quadruples when the concentration of ‘X’ is doubled. The rate expression for the reaction is, r = K Cx n, the value of ‘n’ in this case will be_______________________? a. 0 b. 1 c. 2 d. 3
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4) In case of a P.F.R., there__________________________? a. May be lateral mixing of fluid b. Should not be any mixing along the flow path c. Both A. and B. d. Neither A. nor B.
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5) For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________________? a. A Dirac delta function b. A step function c. A ramp function d. None of the above
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6) An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will__________________? a. Be more in CSTR than in PFR b. Be more in PFR than in CSTR c. Be same in both cases d. Depend on the temperature
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7) Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be ______________ tons/hr ? a. 100 b. 150 c. 200 d. 225
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8) The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by________________? a. dXA/dt = k1 (1 – XA)2 (1 + 2XA) b. dXA/dt = k1 (1 – XA) (1 + 0.5XA) c. dXA/dt = k1 (1 – XA) d. dXA/dt = k1 (1 – XA)/(1 + XA)
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9) Fluid flow in a real packed bed can be approximated as ________________ model? a. Plug flow b. Dispersion c. Mixed flow d. Tank in series
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10) The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________________? a. Plot of – rA Vs CA is a straight line with slope k b. Plot of – rA Vs CA is a hyperbola c. Rate of disappearance of reactant A is maximum, where CA = CB d. Both B & C
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11) A stirred tank reactor compared to tubular-flow reactor provides____________________? a. More uniform operating conditions b. Permits operation at the optimum temperature for a long reaction time c. Higher overall selectivity for a first order consecutive reaction d. All A., B. and C.
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12) Half life period of a first order irreversible reaction A → B is ______________________? a. k/2 b. ln k/2 c. ln 2/k d. ln 0.5/k
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13) The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from ______________________? a. 1.0 to 10-8 b. 1.1 to 102 c. 0.1 to 0.9 d. None of these
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14) ‘Unreacted core model’ represents the reaction involving ______________________? a. Combustion of coal particles b. Roasting of sulphide c. Manufacture of carbon disulphide from elements d. None of these
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15) The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ? a. L √(K/D1) b. 1/[L√(K/D1)] c. 1 d. ∞
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16) For the same residence time, which one will give the maximum conversion ? a. Single stirred tank (v = 5 litres) b. Two stirred tank (each of 2.5 litres) in series c. Stirred tank followed by tubular flow reactor (each of 2.5 litres) d. Single tubular flow reactor (v = 5 litres)
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17) The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be_____________________? a. 60 b. 75 c. 90 d. 100
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18) For a _____________ order reaction, the units of rate constant and rate of reaction are the same ? a. Zero b. First c. Second d. Fractional
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19) A chemical reaction occurs, when the energy of the reacting molecules is ________________ the activation energy of reaction? a. Less than b. Equal to c. More than d. Equal to or more than
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20) Space velocity____________________? a. Describes the extensive operating characteristics of a tubular flow reactor b. Is the maximum feed rate per unit volume of reactor for a given conversion c. Is a measure of the ease of the reaction d. All A., B. and C.
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21) The heat of reaction__________________? a. Depends on the pressure only b. Depends on the mechanism of reaction only c. Depends on both pressure and mechanism of reaction d. Is independent of the mechanism of reaction
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22) The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ? a. 0.875 b. 0.5 c. 0.425 d. Data insufficient to calculate
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23) Photo-chemical reactions occur in presence of ___________________? a. Sunlight b. Darkness c. Solid catalysts d. Monochromatic radiation only
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24) Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________? a. tan hT/T b. tan T/T c. tan hT/tan T d. None of these
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25) The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of ∫∞ 0 E.dt is____________________? a. 0 b. 1 c. ∞ d. √2π
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26) Molecularity of an elementary reaction, P + Q → R + S is ____________________? a. 1 b. 2 c. 3 d. 4
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27) The ‘E’ curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt _____________________? a. At the inlet b. At the outlet c. In the reactor d. Averaged over the inlet and outlet
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28) For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr ? a. 0.4 b. 0.1 c. 0.2 d. None of these
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29) The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line ? a. XA Vs . η b. XA Vs ln η c. XA/(1 – XA)Vs η d. XA(1 – XA)Vs η
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30) Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.) ? a. Reactor dispersion number (D/vL) b. Reduced time (vt/V) c. Thiele modulus L √(k/D1) d. None of these
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