MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4651. |
A standard test for determination of hardness in water is termed as __________ test. |
| A. | EDTA |
| B. | electometric |
| C. | total count |
| D. | presumptive |
| Answer» B. electometric | |
| 4652. |
TLV of lead for public sewer/waste water is about __________ ppm. |
| A. | 1 |
| B. | 25 |
| C. | 150 |
| D. | 650 |
| Answer» B. 25 | |
| 4653. |
Presence of nitrates in water in excess of 50 ppm causes |
| A. | mathenoglobenemia |
| B. | gastroentetitis |
| C. | asphyxiation |
| D. | tooth decay |
| Answer» B. gastroentetitis | |
| 4654. |
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria. |
| A. | anaerobic |
| B. | saphrophytic |
| C. | aerobic |
| D. | parasitic |
| Answer» D. parasitic | |
| 4655. |
Fine grit present in sewage is removed in the __________ during sewage treatment. |
| A. | grit chamber |
| B. | detritus tank |
| C. | trickling filter |
| D. | skimming tank. |
| Answer» C. trickling filter | |
| 4656. |
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ g/m3.( g-microgram) |
| A. | 10 |
| B. | 90 |
| C. | 800 |
| D. | 750 |
| Answer» C. 800 | |
| 4657. |
Which of the following is not a weightless pollutant ? |
| A. | SPM |
| B. | Thermal pollution |
| C. | Radioactive rays |
| D. | Noise pollution |
| Answer» B. Thermal pollution | |
| 4658. |
Aerosols present in atmospheric air may be |
| A. | positively charged. |
| B. | negatively charged. |
| C. | neutral. |
| D. | combination of all (a), (b) & (c). |
| Answer» E. | |
| 4659. |
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ? |
| A. | Benzopyrene |
| B. | Peroxyacyl nitrate |
| C. | Carbon monoxide |
| D. | Sulphur dioxide |
| Answer» D. Sulphur dioxide | |
| 4660. |
__________ plant emits large amount of SO2 as an air pollutant. |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Chloralkali |
| D. | Iron & steel |
| Answer» C. Chloralkali | |
| 4661. |
Noise pollution level in a chemical plant is expressed in |
| A. | roentgen |
| B. | decibel |
| C. | hertz |
| D. | none of these |
| Answer» C. hertz | |
| 4662. |
In the fluid catalytic cracker (FCC), the cracking reaction is __________ (A) and the regeneration is___(B) __________ |
| A. | (A) exothermic (B) endothermic |
| B. | (A) exothermic (B) exothermic |
| C. | (A) endothermic (B) enodthermic |
| D. | (A) endothermic (B) exothermic |
| Answer» E. | |
| 4663. |
Oil is hydrogenated using nickel catalyst in a __________ reactor. |
| A. | batch |
| B. | slurry |
| C. | fluidised bed |
| D. | fixed bed |
| Answer» C. fluidised bed | |
| 4664. |
The performance equations for constant density systems are identical for |
| A. | P.F.R. and backmix reactor. |
| B. | P.F.R. and batch reactor. |
| C. | P.F.R, batch reactor and backmix reactor. |
| D. | batch reactor and backmix reactor. |
| Answer» C. P.F.R, batch reactor and backmix reactor. | |
| 4665. |
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor ? |
| A. | Temperature should be high in the beginning and decreased towards the end of the reaction. |
| B. | Very low temperature should be used throughout the reaction. |
| C. | Very high temperature should be used throughout the reaction. |
| D. | none of these. |
| Answer» B. Very low temperature should be used throughout the reaction. | |
| 4666. |
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. | |
| 4667. |
Higher free energy of activation of a chemical reaction (at a given temperature) implies |
| A. | slower rate of reaction. |
| B. | higher rate of reaction. |
| C. | higher equilibrium conversion. |
| D. | both (b) and (c). |
| Answer» B. higher rate of reaction. | |
| 4668. |
The energy of activation of a chemical reaction |
| A. | is same as heat of reaction at constant pressure. |
| B. | is the minimum energy which the molecules must have before the reaction can take place. |
| C. | varies as fifth power of the temperature. |
| D. | both (b) and (c). |
| Answer» C. varies as fifth power of the temperature. | |
| 4669. |
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 | |
| 4670. |
In water treatment plant, zeolite process is used to remove the __________ of water. |
| A. | acidity |
| B. | alkalinity |
| C. | hardness |
| D. | iron & zinc |
| Answer» D. iron & zinc | |
| 4671. |
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm. |
| A. | 10000 |
| B. | 5 |
| C. | 500 |
| D. | 1000 |
| Answer» C. 500 | |
| 4672. |
Fresh sewage is __________ in nature. |
| A. | acidic |
| B. | neutral |
| C. | alkaline |
| D. | highly acidic |
| Answer» D. highly acidic | |
| 4673. |
In a sedimentation tank, the detention period for water ranges from __________ hours. |
| A. | 2 to 4 |
| B. | 8 to 12 |
| C. | 16 to 20 |
| D. | 24 to 32 |
| Answer» B. 8 to 12 | |
| 4674. |
The order of the reaction, , is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 4675. |
Arhenious equation shows the variation of __________ with temperature. |
| A. | reaction rate |
| B. | rate constant |
| C. | energy of activation |
| D. | frequency factor |
| Answer» C. energy of activation | |
| 4676. |
When a catalyst increases the rate of chemical reaction, the rate constant |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | becomes infinite |
| Answer» C. remains constant | |
| 4677. |
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 | |
| 4678. |
An isothermal aqueous phase reversible reaction, P R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is |
| A. | 0.80 |
| B. | 1.33 |
| C. | 1.60 |
| D. | 2.67 |
| Answer» D. 2.67 | |
| 4679. |
In an ideal mixed reactor (at steady state), the |
| A. | space time is equivalent to holding time for constant density systems. |
| B. | composition throughout the reactor remains same. |
| C. | exit stream has the same composition as the fluid within the reactor. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4680. |
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order. |
| A. | zero |
| B. | first |
| C. | second |
| D. | none of these |
| Answer» D. none of these | |
| 4681. |
Which of the following factors control the design of a fluid-solid reactor ? |
| A. | Reaction kinetics for single particle, |
| B. | Size distribution of solids beingtreated. |
| C. | Flow patterns of solids and fluid in the reactor. |
| D. | All (a), (b) and (c). |
| Answer» E. | |
| 4682. |
A Catalyst |
| A. | increases the equilibrium concentration of the product. |
| B. | changes the equilibrium constant of the reaction. |
| C. | shortens the time to reach the equilibrium. |
| D. | none of these. |
| Answer» D. none of these. | |
| 4683. |
Space time in flow reactor is |
| A. | usually equal to the residence time. |
| B. | the reciprocal of the space velocity. |
| C. | a measure of its capacity. |
| D. | both (a) and (b). |
| Answer» E. | |
| 4684. |
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the |
| A. | catalyst size is reduced or the catalyst diffusivity is reduced. |
| B. | catalyst size is reduced or the catalyst diffusivity is increased. |
| C. | catalyst size is increased or the catalyst diffusivity is reduced. |
| D. | catalyst size is increased or the catalyst diffusivity is increased. |
| Answer» C. catalyst size is increased or the catalyst diffusivity is reduced. | |
| 4685. |
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. | |
| 4686. |
The following gas phase reaction is taking place in a plug flow reactor.A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X). |
| A. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/479-498-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/479-498-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/479-498-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/479-498-4.png"> |
| Answer» D. <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/479-498-4.png"> | |
| 4687. |
The preferred reacting system for oxidation of o-xylene to phthalic anhydride is |
| A. | jacketted liquid phase CSTR. |
| B. | jacketted steam heated multitubular reactor. |
| C. | multitubular reactor with cooling. |
| D. | multistage multitubular reactor with interstage cooling. |
| Answer» B. jacketted steam heated multitubular reactor. | |
| 4688. |
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 | |
| 4689. |
An example of autothermal reactor operation is |
| A. | sulphur dioxide oxidation |
| B. | ethylene oxidation |
| C. | benzene oxidation |
| D. | ammonia synthesis |
| Answer» C. benzene oxidation | |
| 4690. |
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 | |
| 4691. |
Rate of a chemical reaction is not affected by the |
| A. | catalyst. |
| B. | temperature. |
| C. | reactant's concentration. |
| D. | number of molecules of reactants taking part in the reaction. |
| Answer» E. | |
| 4692. |
The mean conversion in the exit stream, for a second order, liquid phase reaction in a non-ideal flow reactor is given by |
| A. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-471-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-471-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-471-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-471-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-471-2.png"> | |
| 4693. |
Integral method for analysing the kinetic data is used |
| A. | when the data are scattered. |
| B. | for testing specific mechanisms with simple rate expressions. |
| C. | both (a) and (b). |
| D. | none of these. |
| Answer» D. none of these. | |
| 4694. |
Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then 't' for a first order reaction is given by |
| A. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/437-12-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/437-12-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/437-12-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/437-12-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/437-12-2.png"> | |
| 4695. |
Inversion of cane sugar is an example of |
| A. | unimolecular reaction with first order. |
| B. | bimolecular reaction with second order. |
| C. | bimolecular reaction with first order. |
| D. | unimolecular reaction with second order. |
| Answer» D. unimolecular reaction with second order. | |
| 4696. |
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst |
| A. | porosity is very important. |
| B. | porosity is of less importance. |
| C. | internal surface area is utilised efficiently. |
| D. | none of these. |
| Answer» C. internal surface area is utilised efficiently. | |
| 4697. |
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 |
| Answer» B. 0.5 | |
| 4698. |
In case of unimolecular type elementary reaction, , plug flow reactor as compared to mixed reactor is |
| A. | more |
| B. | same |
| C. | less |
| D. | unpredictable |
| Answer» B. same | |
| 4699. |
What is the value of 'n' if the reaction rate of the chemical reaction A B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times ? |
| A. | 1/2 |
| B. | 1/3 |
| C. | 1/9 |
| D. | 3 |
| Answer» B. 1/3 | |
| 4700. |
In the hydrodealkylation of toluene to benzene, the following reactions occur:C7H8 + H2 C6H6 + CH42C6H6 C12H10 + H2Toluene 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 | |