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.
| 5001. |
If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion. |
| A. | film |
| B. | ash layer |
| C. | pore |
| D. | none of these |
| Answer» B. ash layer | |
| 5002. |
In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds. |
| A. | catalytic |
| B. | parallel |
| C. | series |
| D. | auto catalytic |
| Answer» E. | |
| 5003. |
For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor. |
| A. | stirred tank |
| B. | tubular flow |
| C. | batch |
| D. | fixed bed |
| Answer» B. tubular flow | |
| 5004. |
What is the Thiele modulus of the solid catalysed first order reaction, , if the pore diffusion offers negligible resistance to reaction ? |
| A. | < 5 |
| B. | < 0.5 |
| C. | > 1 |
| D. | 5 |
| Answer» C. > 1 | |
| 5005. |
B.E.T. method can be used to determine the __________ of a porous catalyst. |
| A. | solid density |
| B. | pore volume |
| C. | surface area |
| D. | all (a), (b) and (c) |
| Answer» D. all (a), (b) and (c) | |
| 5006. |
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). |
| A. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-472-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-472-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-472-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-472-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-472-2.png"> | |
| 5007. |
The units of frequency factor in Arhenious equation |
| A. | are the same as those of the rate constant. |
| B. | depend on the order of the reaction. |
| C. | depend on temperature, pressure etc. of the reaction. |
| D. | are cycles per unit time. |
| Answer» B. depend on the order of the reaction. | |
| 5008. |
Which of the following is not a chemical step in a fluid solid catalytic reaction ? |
| A. | Surface chemical reaction |
| B. | Adsorption |
| C. | Desorption |
| D. | None of these |
| Answer» E. | |
| 5009. |
For a series of reactions having k1 << k2, the reaction system can be approximated as |
| A. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/476-478-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/475-469-1.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/476-478-2.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-reaction-engineering/476-478-1u.png"> |
| Answer» E. | |
| 5010. |
A photochemical reaction is __________ light. |
| A. | initiated by |
| B. | accompanied with emission of |
| C. | catalysed by |
| D. | used to convert heat energy into |
| Answer» B. accompanied with emission of | |
| 5011. |
In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation. |
| A. | adiabatic |
| B. | isothermal |
| C. | non-adiabatic |
| D. | none of these. |
| Answer» D. none of these. | |
| 5012. |
'Unreacted core model' represents the reaction involving |
| A. | combustion of coal particles. |
| B. | roasting of sulphide ores. |
| C. | manufacture of carbon disulphide from elements. |
| D. | none of these. |
| Answer» C. manufacture of carbon disulphide from elements. | |
| 5013. |
When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield. |
| A. | is greater than |
| B. | is smaller than |
| C. | equals |
| D. | can be either greater or smaller than (depends on the type of reaction) |
| Answer» D. can be either greater or smaller than (depends on the type of reaction) | |
| 5014. |
The half life period of a first order reaction is |
| A. | always the same irrespective of the reaction. |
| B. | independent on initial concentration of the reactants. |
| C. | proportional to the initial concentration of reactants. |
| D. | half the specific rate constant. |
| Answer» C. proportional to the initial concentration of reactants. | |
| 5015. |
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) |
| Answer» E. | |
| 5016. |
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, can't be predicted |
| Answer» D. data insufficient, can't be predicted | |
| 5017. |
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. | |
| 5018. |
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ? |
| A. | Langmuir adsorption isotherm |
| B. | Adsorption isobar |
| C. | Freundlich adsorption isotherm |
| D. | None of these |
| Answer» C. Freundlich adsorption isotherm | |
| 5019. |
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. | |
| 5020. |
Fluid flow in a real packed bed can be approximated as __________ model. |
| A. | plug flow |
| B. | dispersion |
| C. | mixed flow |
| D. | tank in series |
| Answer» C. mixed flow | |
| 5021. |
Which of the following is the most suitable for isothermal operation ? |
| A. | Batch reactor |
| B. | Back-mix reactor |
| C. | Plug-flow reactor |
| D. | Fixed bed reactor |
| Answer» C. Plug-flow reactor | |
| 5022. |
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated. |
| A. | decreases. |
| B. | increases. |
| C. | remains constant. |
| D. | may increase or decrease ; depends on the chemical characteristics of polluted water. |
| Answer» B. increases. | |
| 5023. |
Particles having diameter greater than 75 m (micrometer = 10-6 mm) are called |
| A. | grit |
| B. | dust |
| C. | powder |
| D. | smoke |
| Answer» B. dust | |
| 5024. |
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes |
| A. | fading of dyes on textiles. |
| B. | corrosion, tarnishing & soiling of metals. |
| C. | reduced strength of textiles. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 5025. |
Nitrogen oxides (NOx) is not produced in the __________ industry. |
| A. | nitric acid making |
| B. | nitrogenous fertiliser |
| C. | detergent |
| D. | any of these |
| Answer» D. any of these | |
| 5026. |
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in |
| A. | Arizona (U.S.A.) |
| B. | Chernobyl (undivided U.S.S.R.) |
| C. | Pensylvania (U.S.A.) |
| D. | Moscow (U.S.S.R.) |
| Answer» C. Pensylvania (U.S.A.) | |
| 5027. |
Dissolved oxygen content in river water is around __________ ppm. |
| A. | 5 |
| B. | 100 |
| C. | 250 |
| D. | 500 |
| Answer» B. 100 | |
| 5028. |
Presence of bacteria in potable (drinking) water causes |
| A. | turbidity |
| B. | disease |
| C. | bad odour |
| D. | bad taste & colour |
| Answer» C. bad odour | |
| 5029. |
Presence of __________ hardness is responsible for the temporary hardness in water. |
| A. | carbonate |
| B. | calcium |
| C. | choride |
| D. | sulphate |
| Answer» C. choride | |
| 5030. |
Dose of chlorine for disinfection of water is about __________ mg/litre of water. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.3 |
| D. | 1 |
| Answer» E. | |
| 5031. |
Peroxyacyl nitrate (PAN), a pollutant is found in the |
| A. | automobile exhaust. |
| B. | flue gas of coal based power plant. |
| C. | exhaust of nitric acid plant. |
| D. | exhaust of sulphuric acid plant. |
| Answer» B. flue gas of coal based power plant. | |
| 5032. |
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water. |
| A. | turbidity |
| B. | color (Hazen) |
| C. | total solids |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 5033. |
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools). |
| A. | 1-2 |
| B. | 5-10 |
| C. | 15-20 |
| D. | 25-30 |
| Answer» C. 15-20 | |
| 5034. |
Which of the following is not a practical method of low level radioactive waste disposal ? |
| A. | Dilution with inert material. |
| B. | Discharging to atmosphere through tall stacks after dilution. |
| C. | Disposing off in rivers & oceans. |
| D. | Filling in steel crates and shooting it off out of earth's gravity. |
| Answer» E. | |
| 5035. |
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels. |
| A. | 3 |
| B. | 30 |
| C. | 70 |
| D. | 100 |
| Answer» B. 30 | |
| 5036. |
Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the |
| A. | gravity settling chamber |
| B. | cyclone separator |
| C. | electrostatic precipitator |
| D. | bag filter |
| Answer» D. bag filter | |
| 5037. |
Which of the following is not a secondary air pollutant ? |
| A. | Ozone |
| B. | Photochemical smog |
| C. | Sulphur dioxide |
| D. | All (a), (b) & (c) |
| Answer» D. All (a), (b) & (c) | |
| 5038. |
The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent. |
| A. | 1 |
| B. | 4 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 5039. |
The main industrial source of emission of hydrogen sulphide air pollutant is |
| A. | petroleum refineries. |
| B. | coal based thermal power plants. |
| C. | pulp and paper plant. |
| D. | metallurgical roasting & smelting plant. |
| Answer» C. pulp and paper plant. | |
| 5040. |
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances. |
| A. | radioactive |
| B. | organic |
| C. | inorganic |
| D. | none of these |
| Answer» D. none of these | |
| 5041. |
With increase in K2/K1 in case of a unimolecular type elementary reactions, the fractional yield of 'R' in mixed reactor (for a given conversion of 'A') |
| A. | decreases |
| B. | increases |
| C. | increases linearly |
| D. | remains same |
| Answer» B. increases | |
| 5042. |
Velocity of a chemical reaction |
| A. | decreases with increase in temperature. |
| B. | increases with increase of pressure of reactants for all reactions. |
| C. | decreases with increase of reactant concentration. |
| D. | none of these. |
| Answer» E. | |
| 5043. |
The equivalent diameter for pressure drop is __________ that for heat transfer. |
| A. | smaller than |
| B. | greater than |
| C. | equal to |
| D. | not related with |
| Answer» E. | |
| 5044. |
Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder |
| A. | has greater structural strength. |
| B. | is easy to fabricate. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 5045. |
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called |
| A. | downcomer liquid seal |
| B. | static submergence |
| C. | skirt clearance |
| D. | none of these |
| Answer» C. skirt clearance | |
| 5046. |
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes |
| A. | fire hazards. |
| B. | explosion hazards. |
| C. | persistent foam. |
| D. | depletion of dissolved oxygen. |
| Answer» D. depletion of dissolved oxygen. | |
| 5047. |
Liquid gradient over the tray results due to the |
| A. | resistance offered to flow of liquids by caps & risers and the flow of gas. |
| B. | low gas velocity. |
| C. | large plate spacing. |
| D. | large reflux ratio. |
| Answer» B. low gas velocity. | |
| 5048. |
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ? |
| A. | To increase the residence time of shell side fluid. |
| B. | To provide support to the tube bundle. |
| C. | To reduce the induced vibration in the tubes. |
| D. | To increase the tube side heat transfer co-efficient by inducing turbulence. |
| Answer» E. | |
| 5049. |
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator. |
| A. | Tube dia is 3-6 cms, while tube length in 3-6 metres. |
| B. | Steam is fed to the shell, whereas the liquor is filled inside the tube. |
| C. | Liquor level is maintained at l/3rd to 1/2 of the height of the tube. |
| D. | none of these. |
| Answer» E. | |
| 5050. |
Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger ? |
| A. | 75% cut segmental baffle. |
| B. | 25% cut segmental baffle. |
| C. | Orifice baffle. |
| D. | Disk and doughnut baffle. |
| Answer» C. Orifice baffle. | |