MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1443 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1301. |
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) |
| Answer» D. Neither (A) nor (B) | |
| 1302. |
Promoter |
| A. | Initiates a chemical reaction and is a catalyst by itself |
| B. | Alters the position of equilibrium in a reversible reaction |
| C. | Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals |
| D. | All (A), (B) and (C) |
| Answer» D. All (A), (B) and (C) | |
| 1303. |
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 |
| Answer» E. | |
| 1304. |
In the hydrodealkylation of toluene to benzene, the following reactions occur: C7H8 + H2 → C6H6 + CH4 2C6H6 ⇌ C12H10 + H2 www.objectivebooks.com Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is |
| A. | 0.16 |
| B. | 0.144 |
| C. | 0.152 |
| D. | 0.136 |
| Answer» C. 0.152 | |
| 1305. |
Vegetable oils are hydrogenated in a __________ reactor. |
| A. | Slurry |
| B. | Plug flow |
| C. | Homogeneous catalytic |
| D. | None of these |
| Answer» B. Plug flow | |
| 1306. |
A typical example of an exothermic reversible reaction conducted at high pressure in industry is |
| A. | Dehydration of ethanol |
| B. | Methanol synthesis |
| C. | Reformation of methane |
| D. | Polymerisation of ethylene |
| Answer» B. Methanol synthesis | |
| 1307. |
B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm. |
| A. | Langmuir |
| B. | Freundlich |
| C. | Tempkin |
| D. | None of these |
| Answer» B. Freundlich | |
| 1308. |
Reaction rate of a first order reaction, which is half completed in 23 minutes will be |
| A. | 0.03 sec-1 |
| B. | 0.03 min-1 |
| C. | 0.03 hr-1 |
| D. | 0.05 min-1 |
| Answer» C. 0.03 hr-1 | |
| 1309. |
Half life period of a chemical reaction is proportional to CA0 -1 , if the reaction is of __________ order. |
| A. | First |
| B. | Zero |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 1310. |
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction. |
| A. | Elementary |
| B. | Non-elementary |
| C. | Parallel |
| D. | Autokinetic |
| Answer» B. Non-elementary | |
| 1311. |
Chemical kinetics can predict the __________ of a chemical reaction. |
| A. | Rate |
| B. | Feasibility |
| C. | Both (A) & (B) |
| D. | Neither (A) nor (B) |
| Answer» B. Feasibility | |
| 1312. |
'n' number of plug flow reactors (P.F.R) in series with a total volume 'V' gives the same conversion as one P.F.R. of volume |
| A. | V/n |
| B. | V |
| C. | V.n |
| D. | 1/V |
| Answer» C. V.n | |
| 1313. |
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to |
| A. | Lose a proton |
| B. | Gain a proton |
| C. | Lose an electron |
| D. | None of these |
| Answer» B. Gain a proton | |
| 1314. |
The concentration of A in a first order reaction, A → B, decreases |
| A. | Linearly with time |
| B. | Exponentially with time |
| C. | Very abruptly towards the end of the reaction |
| D. | Logarithmically with time |
| Answer» C. Very abruptly towards the end of the reaction | |
| 1315. |
The reactions with low activation energy are |
| A. | Always spontaneous |
| B. | Slow |
| C. | Fast |
| D. | Non-spontaneous |
| Answer» D. Non-spontaneous | |
| 1316. |
Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes. |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 10 |
| Answer» C. 6 | |
| 1317. |
Rate of an autocatalytic chemical reaction is a function of |
| A. | Temperature only |
| B. | Pressure only |
| C. | Composition only |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1318. |
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by |
| A. | Diffusion within the pellet |
| B. | Reaction |
| C. | External mass transfer |
| D. | None of the above |
| Answer» B. Reaction | |
| 1319. |
Oil is hydrogenated using nickel catalyst in a __________ reactor |
| A. | Batch |
| B. | Slurry |
| C. | Fluidised bed |
| D. | Fixed bed |
| Answer» C. Fluidised bed | |
| 1320. |
The use of space time is preferred over the mean residence time in the design of a/an |
| A. | Batch reactor |
| B. | Ideal tubular-flow reactor |
| C. | Slurry reactor |
| D. | CSTR |
| Answer» C. Slurry reactor | |
| 1321. |
The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction. |
| A. | Biochemical |
| B. | Photochemical |
| C. | Catalytic |
| D. | Autocatalytic |
| Answer» E. | |
| 1322. |
Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism. |
| A. | Proportional to |
| B. | Independent of |
| C. | Inversely proportional to |
| D. | Proportional to the square of |
| Answer» B. Independent of | |
| 1323. |
Which of the following is not endothermic in nature? |
| A. | Combustion of sulphur |
| B. | Gasification of carbon |
| C. | Thermal cracking of fuel oil |
| D. | Steam reforming of naphtha |
| Answer» B. Gasification of carbon | |
| 1324. |
Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum. |
| A. | Increases |
| B. | Remains unchanged |
| C. | Decreases |
| D. | Unpredictable from the data |
| Answer» D. Unpredictable from the data | |
| 1325. |
Differential method for analysing the kinetic data is used |
| A. | For testing complicated mechanisms |
| B. | When the data are scattered |
| C. | When rate expressions are very simple |
| D. | None of these |
| Answer» B. When the data are scattered | |
| 1326. |
For a tubular flow reactor with uniform concentration and temperature, the independent variable is |
| A. | Time |
| B. | Length |
| C. | Diameter |
| D. | None of these |
| Answer» C. Diameter | |
| 1327. |
For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single |
| A. | CSTR of volume V |
| B. | PFR of volume V |
| C. | CSTR of volume V/X |
| D. | PFR of volume V/X |
| Answer» C. CSTR of volume V/X | |
| 1328. |
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction. |
| A. | Non-catalytic homogeneous |
| B. | Non-catalytic heterogeneous |
| C. | Catalytic homogenous |
| D. | Catalytic heterogeneous |
| Answer» D. Catalytic heterogeneous | |
| 1329. |
The catalyst in a first order chemical reaction changes the |
| A. | Equilibrium constant |
| B. | Activation energy |
| C. | Heat of formation of the product |
| D. | Heat of reaction |
| Answer» C. Heat of formation of the product | |
| 1330. |
The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the |
| A. | Equilibrium constant is infinite |
| B. | Fractional conversion of A at equilibrium is unity |
| C. | Concentration of A at equilibrium is zero |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1331. |
For a tubular reactor with space time 'η' and residence time 'ζ', the following statement holds good. |
| A. | η and θ are always equal |
| B. | η = θ, when the fluid density changes in the reactor |
| C. | η = θ, for an isothermic tubular reactor in which the density of the process fluid is constant |
| D. | η = θ, for a non-isothermal reactor |
| Answer» D. η = θ, for a non-isothermal reactor | |
| 1332. |
For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of: |
| A. | Ideal plug flow |
| B. | Bypass |
| C. | Dead zone |
| D. | Channelling |
| Answer» D. Channelling | |
| 1333. |
Kinetics of a solid catalysed reaction can best be studied in a __________ reactor. |
| A. | Batch |
| B. | Plug-flow |
| C. | Mixed |
| D. | None of these |
| Answer» D. None of these | |
| 1334. |
Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes. |
| A. | 18 |
| B. | 24 |
| C. | 6 |
| D. | 12 |
| Answer» C. 6 | |
| 1335. |
The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is |
| A. | 0.5 |
| B. | -0.5 |
| C. | 1 |
| D. | 1.5 |
| Answer» C. 1 | |
| 1336. |
Arrhenius equation represents graphically the variation between the __________ and temperature. |
| A. | Rate of reaction |
| B. | Frequency factor |
| C. | Rate constant |
| D. | Activation energy |
| Answer» D. Activation energy | |
| 1337. |
A rise in temperature |
| A. | Normally tends to increase the reaction rate |
| B. | Does not affect a catalysed reaction |
| C. | Does not affect photo-chemical reaction rates |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1338. |
The extent of a reaction is |
| A. | Different for reactants and products |
| B. | Dimensionless |
| C. | Depends on the stoichiometric co-efficient |
| D. | All of the above |
| Answer» E. | |
| 1339. |
BET apparatus is used to determine the |
| A. | Specific surface of a porous catalyst |
| B. | Pore size distribution |
| C. | Pore diameter |
| D. | Porosity of the catalyst bed |
| Answer» B. Pore size distribution | |
| 1340. |
For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium? |
| A. | 0.253 |
| B. | 0.338 |
| C. | 0.152 |
| D. | 0.637 |
| Answer» C. 0.152 | |
| 1341. |
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance. |
| A. | Pore diffusion |
| B. | Gas film |
| C. | Chemical reaction |
| D. | None of these |
| Answer» B. Gas film | |
| 1342. |
Bulk diffusion in catalyst pore __________ with increase in pressure. |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases exponentially |
| Answer» C. Remains unchanged | |
| 1343. |
In the fluid catalytic cracker (FCC), the cracking reaction is __________ (i) and the regeneration is__________ (ii) __________. |
| A. | (i) exothermic (ii) endothermic |
| B. | (i) exothermic (ii) exothermic |
| C. | (i) endothermic (ii) endothermic |
| D. | (i) endothermic (ii) exothermic |
| Answer» E. | |
| 1344. |
Autocatalytic reactions are best carried out in a |
| A. | CSTR |
| B. | CSTR in series |
| C. | Plug flow reactor |
| D. | Recycle reactor |
| Answer» E. | |
| 1345. |
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is |
| A. | 0.33 |
| B. | 0.5 |
| C. | 1 |
| D. | Data insufficient, cant be predicted |
| Answer» D. Data insufficient, cant be predicted | |
| 1346. |
Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature. |
| A. | Higher |
| B. | Much higher |
| C. | Lower |
| D. | Much lower |
| Answer» E. | |
| 1347. |
The rate constant of a reaction is a function of the |
| A. | Time of reaction |
| B. | Time of reaction |
| C. | Extent of reaction |
| D. | Initial concentration of the reactants |
| Answer» C. Extent of reaction | |
| 1348. |
A plug-flow reactor is characterised by |
| A. | High capacity |
| B. | Presence of axial mixing |
| C. | Presence of lateral mixing |
| D. | Constant composition and temperature of reaction mixture |
| Answer» D. Constant composition and temperature of reaction mixture | |
| 1349. |
The vessel dispersion number (D/μL) for plug flow is |
| A. | 0 |
| B. | 500 |
| C. | 750 |
| D. | ∞ |
| Answer» B. 500 | |
| 1350. |
The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be __________ times. |
| A. | 4 |
| B. | 16 |
| C. | 8 |
| D. | 2 |
| Answer» C. 8 | |