The performance of a cascade of CSTR's can be improved by adding (A) A P.F. reactor in series (B) A P.F. reactor in parallel (C) More CSTR's in series (D) More CSTR's in parallel

The performance of a cascade of CSTR's can be improved by adding
(A) A P.F. reactor in series
(B) A P.F. reactor in parallel
(C) More CSTR's in series
(D) More CSTR's in parallel
by

1 Answer

Answer :

(C) More CSTR's in series
by

Related questions

Backmixing is most predominant in (A) A well stirred batch reactor (B) A plug-flow reactor (C) A single CSTR (D) CSTR's connected in series

Description : Backmixing is most predominant in (A) A well stirred batch reactor (B) A plug-flow reactor (C) A single CSTR (D) CSTR's connected in series

Last Answer : (C) A single CSTR

The sequence in which three CSTR's of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is (A) 15, 10, 5(B) 5, 10, 15 (C) 10, 5, 15 (D) 10, 15, 5

Description : The sequence in which three CSTR's of volumes 5, 10 and 15 m3 will be connected in series to obtain the maximum production in a second order irreversible reaction is (A) 15, 10, 5 (B) 5, 10, 15 (C) 10, 5, 15 (D) 10, 15, 5

Last Answer : (A) 15, 10, 5

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

Description : 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

Last Answer : (B) P.F.R. and batch reactor

For an autocatalytic reactor, the suitable reactor set up is(A) P.F. reactors in series (B) CSTR in series (C) CSTR followed by P.F. reactor (D) P.F. reactor followed by CSTR

Description : For an autocatalytic reactor, the suitable reactor set up is (A) P.F. reactors in series (B) CSTR in series (C) CSTR followed by P.F. reactor (D) P.F. reactor followed by CSTR

Last Answer : (C) CSTR followed by P.F. reactor

The introduction of interpoles in between the main pole improves the performance of d.c. machines, because (A) The interpole produces additional flux to augment the developed torque. (B) The flux waveform is improved with reduction in harmonics. (C) The inequality of air flux on the top and bottom halves of armature is removed. (D) A counter e.m.f. is induced in the coil undergoing commutation.

Description : The introduction of interpoles in between the main pole improves the performance of d.c. machines, because (A) The interpole produces additional flux to augment the developed torque. (B) The flux waveform is ... armature is removed. (D) A counter e.m.f. is induced in the coil undergoing commutation.

Last Answer : Ans: D Counter e.m.f is produced, it neutralizes the reactive emf.

Pick out the wrong statement: (A) Chemical reactions with high activation energy are very temperature sensitive (B) A flat velocity profile exists in a plug flow reactor (C) The residence time for all the elements of fluid in case of a P.F.R. need not be same (D) Half life of a reaction increases with increased initial concentration for reaction orders more than one

Description : Pick out the wrong statement: (A) Chemical reactions with high activation energy are very temperature sensitive (B) A flat velocity profile exists in a plug flow reactor (C) The residence ... D) Half life of a reaction increases with increased initial concentration for reaction orders more than one

Last Answer : (C) The residence time for all the elements of fluid in case of a P.F.R. need not be same

For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a (A) Batch reactor is preferred over a single CSTR for high yield (B) Tubular reactor is preferred over a single CSTR for high yield (C) Both (A) and (B) (D) Single CSTR is the most suitable

Description : For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a (A) Batch reactor is preferred over a ... a single CSTR for high yield (C) Both (A) and (B) (D) Single CSTR is the most suitable

Last Answer : (C) Both (A) and (B)

The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is: (A) ∞(B) 0 (C) 1 (D) > 1

Description : The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is: (A) ∞ (B) 0 (C) 1 (D) > 1

Last Answer : (C) 1

With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will (A) Increase (B) Decrease (C) Remain same (D) Data in insufficient; can't be predicted

Description : With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will (A) Increase (B) Decrease (C) Remain same (D) Data in insufficient; can't be predicted

Last Answer : (A) Increase

With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be (A) Higher in P.F. reactor (B) Higher in CSTR (C) Same in both the reactors (D) Data insufficient; can't be predicted

Description : With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be (A) Higher in P.F. reactor (B) Higher in CSTR (C) Same in both the reactors (D) Data insufficient; can't be predicted

Last Answer : (A) Higher in P.F. reactor

The speed of a squirrel-cage motor is usually changed by _____________. A. varying the frequency to the machine B. adding resistance in series with the stator windings C. adding resistance in parallel with the stator windings D. changing the number of connected poles in the stator

Description : The speed of a squirrel-cage motor is usually changed by _____________. A. varying the frequency to the machine B. adding resistance in series with the stator windings C. adding resistance in parallel with the stator windings D. changing the number of connected poles in the stator

Last Answer : Answer: D

If an antenna is too short for the wavelength being used, the effective length can be increased by adding: A. capacitance in series B. inductance in series C. resistance in parallel D. resistance in series

Description : If an antenna is too short for the wavelength being used, the effective length can be increased by adding: A. capacitance in series B. inductance in series C. resistance in parallel D. resistance in series

Last Answer : B. inductance in series

A circuit has a resistance of 200 ohms. The resistance of the circuit can be reduced to 120 ohms by adding which of the following to the circuit. w) 80 ohm resistor in series x) 150 ohm resistor in parallel y) 240 ohm resistor in series z) 300 ohm resistor in parallel

Description : A circuit has a resistance of 200 ohms. The resistance of the circuit can be reduced to 120 ohms by adding which of the following to the circuit. w) 80 ohm resistor in series x) 150 ohm resistor in parallel y) 240 ohm resistor in series z) 300 ohm resistor in parallel

Last Answer : ANSWER: Z -- 300 OHM RESISTOR IN PARALLEL

Fertility of soil can be improved by : [IAS 1989] (a) adding living earthworms (b) adding dead earthworms (c) removing dead earthworms (d) removing living earthworms and adding dead earthworms

Description : Fertility of soil can be improved by : [IAS 1989] (a) adding living earthworms (b) adding dead earthworms (c) removing dead earthworms (d) removing living earthworms and adding dead earthworms

Last Answer : Ans: (a)

Fertility of soil can be improved by? a. Adding living earthworms b. Adding dead earthworms c. Removing dead earthworms d. Removing dead earthworms and adding living earthworms e. None of these

Description : Fertility of soil can be improved by? a. Adding living earthworms b. Adding dead earthworms c. Removing dead earthworms d. Removing dead earthworms and adding living earthworms e. None of these

Last Answer : a. Adding living earthworms

Workability improved by adding (A) Air-entraining agent (B) Foaming agent (C) Oily-agent (D) All the above

Description : Workability improved by adding (A) Air-entraining agent (B) Foaming agent (C) Oily-agent (D) All the above

Last Answer : (D) All the abov

Workability improved by adding (A) Fly ash (B) Hydrated lime (C) Calcium chloride (D) All the above

Description : Workability improved by adding (A) Fly ash (B) Hydrated lime (C) Calcium chloride (D) All the above

Last Answer : Answer: Option D

The workability of concrete can be improved by adding (a) Hydrated lime (b) Fly ash (c) Calcium chloride (d) All the above

Description : The workability of concrete can be improved by adding (a) Hydrated lime (b) Fly ash (c) Calcium chloride (d) All the above

Last Answer : (d) All the above

The performance of an agent can be improved by __________ a) Learning b) Observing c) Perceiving d) None of the mentioned

Description : The performance of an agent can be improved by __________ a) Learning b) Observing c) Perceiving d) None of the mentioned

Last Answer : a) Learning

Dropping an unprofitable product immediately is the best strategy when 1. All advertising and promotional efforts have been exhausted 2. Losses are too great to prolong the product's life 3. The product's performance cannot be improved 4. There is low compatibility with the firm's business strategies 5. None of these

Description : Dropping an unprofitable product immediately is the best strategy when 1. All advertising and promotional efforts have been exhausted 2. Losses are too great to prolong the product's life 3. The ... improved 4. There is low compatibility with the firm's business strategies 5. None of these

Last Answer : Losses are too great to prolong the product's life

Dropping an unprofitable product immediately is the best strategy when A)all advertising and promotional efforts have been exhausted. B)losses are too great to prolong the product's life. C)the product's performance cannot be improved. D) there is low compatibility with the firm's business strategies.

Description : Dropping an unprofitable product immediately is the best strategy when A)all advertising and promotional efforts have been exhausted. B)losses are too great to prolong the product's life. C)the ... performance cannot be improved. D) there is low compatibility with the firm's business strategies.

Last Answer : B)losses are too great to prolong the product's life.

What describes a process of continuously measuring results and comparing those results to optimal performance so that actual performance may be improved? a. Performance b. Capacity planning c. Benchmarking d. Data cleansing

Description : What describes a process of continuously measuring results and comparing those results to optimal performance so that actual performance may be improved? a. Performance b. Capacity planning c. Benchmarking d. Data cleansing

Last Answer : c. Benchmarking

The academic performance of students can be improved if parents are encouraged to (A) supervise the work of their wards (B) arrange for extra tuition (C) remain unconcerned about it (D) interact with teachers frequently

Description : The academic performance of students can be improved if parents are encouraged to (A) supervise the work of their wards (B) arrange for extra tuition (C) remain unconcerned about it (D) interact with teachers frequently

Last Answer : (A) supervise the work of their wards

In flow reactors, the performance equations interrelate the rate of reaction to the (A) Feed rate (B) Reactor volume (C) Extent of reaction (D) All (A), (B) and (C)

Description : In flow reactors, the performance equations interrelate the rate of reaction to the (A) Feed rate (B) Reactor volume (C) Extent of reaction (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Pick out the wrong statement. (A) Cellulose acetate membranes are used in dialysis process (B) Elutriation process refers to when the soluble material is largely concentrated on the surface of an insoluble solid and is simply washed off by the solvent (C) 'Cascade' means a group of stages interconnected so that various streamflow from one to another(D) Zirconia probe is used for the humidity measurement

Description : Pick out the wrong statement. (A) Cellulose acetate membranes are used in dialysis process (B) Elutriation process refers to when the soluble material is largely concentrated on the surface of an ... that various streamflow from one to another (D) Zirconia probe is used for the humidity measurement

Last Answer : (D) Zirconia probe is used for the humidity measurement

Cascade control is (A) The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller (B) Used when changes in process conditions cause serious upsets in the controlled variable (C) Useful to control flow from temperature (D) All 'a', 'b' & 'c'

Description : Cascade control is (A) The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller (B) Used when changes in process conditions cause serious upsets in the controlled variable (C) Useful to control flow from temperature (D) All 'a', 'b' & 'c'

Last Answer : (D) All 'a', 'b' & 'c'

Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f? a. 40 W b. 90W c. 100W d. 120W

Description : Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f? a. 40 W b. 90W c. 100W d. 120W

Last Answer : b. 90W

A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is (A) d(VCA )/dt = -F (CAF - CA ) - kCA 2V (B) d(VCA )/dt = F (CAF - CA ) - kCA 2V (C) d(VCA )/dt = -FCA - kCA 2V (D) d(VCA )/dt = FCAF - kCA 2V

Description : A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume ... 2V (C) d(VCA )/dt = -FCA - kCA 2V (D) d(VCA )/dt = FCAF - kCA 2V

Last Answer : (D) d(VCA )/dt = FCAF - kCA 2V

Transient stability can be improved by a) By putting series capacitor b) By using dynamic resister c) Auto re-closers d) All of the above

Description : Transient stability can be improved by a) By putting series capacitor b) By using dynamic resister c) Auto re-closers d) All of the above

Last Answer : Ans: All of the above

For a fluidised bed reactor, the most suitable/relevant model is a __________ model. (A) Tank in series (B) Bubbling bed (C) Plug flow (D) None of these

Description : For a fluidised bed reactor, the most suitable/relevant model is a __________ model. (A) Tank in series (B) Bubbling bed (C) Plug flow (D) None of these

Last Answer : (B) Bubbling bed

Exothermic reactions are best carried out in (A) A CSTR (B) CSTR in series (C) A plug flow reactor followed by CSTR (D) CSTR followed by a plug flow reactor

Description : Exothermic reactions are best carried out in (A) A CSTR (B) CSTR in series (C) A plug flow reactor followed by CSTR (D) CSTR followed by a plug flow reactor

Last Answer : (D) CSTR followed by a plug flow reactor

N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions. (A) First (B) Second (C) Third (D) Any

Description : N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions. (A) First (B) Second (C) Third (D) Any

Last Answer : (D) Any

The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is (A) Backmix reactor (B) Plug flow reactor (C) Series of CSTR (D) PFR in series

Description : The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is (A) Backmix reactor (B) Plug flow reactor (C) Series of CSTR (D) PFR in series

Last Answer : A) Backmix reactor

The response curve for a step input signal from a reactor is called C￾curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to (A) m (B) 1/m (C) √m (D) m2

Description : The response curve for a step input signal from a reactor is called C￾curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to (A) m (B) 1/m (C) √m (D) m2

Last Answer : (B) 1/m

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

Description : 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

Last Answer : (D) Both (A) and (C) hold good

Autocatalytic reactions are best carried out in a (A) CSTR (B) CSTR in series (C) Plug flow reactor (D) Recycle reactor

Description : Autocatalytic reactions are best carried out in a (A) CSTR (B) CSTR in series (C) Plug flow reactor (D) Recycle reactor

Last Answer : (D) Recycle reactor

The conversion for a first order liquid phase reaction. A → B in a CSTRis 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

Description : The conversion for a first order liquid phase reaction. A → B in a CSTRis 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

Last Answer : (B) 75

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)

Description : 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)

Last Answer : (D) Single tubular flow reactor (v = 5 litres)

In a R-L series circuit the power factor P.F. is _________.

Last Answer : In a R-L series circuit the power factor P.F. is Leading.

If buying cheap causes a cascade of negative effects, what to do if you're on a budget?

Description : If buying cheap causes a cascade of negative effects, what to do if you're on a budget?

Last Answer : Interesting question. It makes me happy to see people being conscientious consumers. I have a lot of hope for our generation. One option might be to try to make as much stuff yourself as ... in the landfills, and no international repercussions. Good luck. I look forward to seeing more responses.

When is the best time of year to hike in the Cascade or Olympic mountain ranges?

Description : When is the best time of year to hike in the Cascade or Olympic mountain ranges?

Last Answer : The Olympic mountain range is a rainforest, and therefore wet - and cold - for much of the year. The Cascades get snow in the winter and the whole pacific northwest is pretty chilly from Sept/Oct thru ... Cascades, and have had great times doing it. I'd definately take bugs over snow and rain :)

What is cascade method ?

Description : What is cascade method ?

Last Answer : The method of connecting the output of an amplifier stage of a multistage amplifier to the input of the next amplifier stage through a coupling device is called cascade method.

What is the advantage of cascade refrigeration?

Description : What is the advantage of cascade refrigeration?

Last Answer : Advantage of cascade refrigeration system. This system has the following advantages compared to a two stage compression system. 1.Energy is saved because the system allows use of refrigerants that have ... for each of the higher temperature side. 2. It allows stable ultra low temperature operation.

Phosphoinositide cascade is activated on binding of catecholamines to (A) α1-Adrenergic receptors (B) α2-Adrenergic receptors (C) β1-Adrenergic receptors (D) β2-Adrenergic receptors

Description : Phosphoinositide cascade is activated on binding of catecholamines to (A) α1-Adrenergic receptors (B) α2-Adrenergic receptors (C) β1-Adrenergic receptors (D) β2-Adrenergic receptors

Last Answer : Answer : A

Enzymes are required in traces because they (A) Have high turnover number (B) Remain unused at the end of reaction and are re used (C) Show cascade effect (D) All correct

Description : Enzymes are required in traces because they (A) Have high turnover number (B) Remain unused at the end of reaction and are re used (C) Show cascade effect (D) All correct

Last Answer : Answer : D

Which of the following statement(s) is/are correct concerning the immunoinflammatory response to shock? a. The anaphylactoxins, C3a and C5a, are products of activation of only the classical pathway of the compliment cascade b. Eicosanoids, such as prostaglandins are stored in platelets and endothelial cells and released in response to inflammatory stimuli c. Thromboxane and PGI2 have similar effects d. Platelet-activating factor can be released by both circulating and fixed tissue cells

Description : Which of the following statement(s) is/are correct concerning the immunoinflammatory response to shock? a. The anaphylactoxins, C3a and C5a, are products of activation of only the classical pathway ... effects d. Platelet-activating factor can be released by both circulating and fixed tissue cells

Last Answer : Answer: d Inflammatory mediators have recently been recognized as playing a significant role in the clinical manifestations and progression of shock and the development ... increased pulmonary vascular resistance, bronchoconstriction, peripheral vasodilatation, and increased vascular permeability

The neurohormonal arm of the stress response is well defined. Less is known about the inflammatory arm mediated primarily by cytokines. Which of the following statement(s) is/are true concerning this arm of the surgical stress response? a. Cytokines primarily work locally via direct cell-to-cell communication b. Cytokines are never detectable in the systemic bloodstream c. Cytokines are produced only by immune cells attracted to the site of injury d. Cytokine release may stimulate the release of other cytokines leading to an important cascade of events

Description : The neurohormonal arm of the stress response is well defined. Less is known about the inflammatory arm mediated primarily by cytokines. Which of the following statement(s) is/are true ... Cytokine release may stimulate the release of other cytokines leading to an important cascade of events

Last Answer : Answer: a, d Cytokines, which are produced at the site of injury by endothelial cells and by diverse immune cells throughout the body, also occupy a pivotal position in the stress response ... act as hormones and spill over into the systemic circulation and become detectable in the bloodstream

Which of the following statements about the coagulation cascade is/are true? A. The intrinsic pathway of coagulation is the predominant pathway in vivo for hemostasis and coagulation. B. The intrinsic pathway beginning with the activation of factor XII is the predominant in vivo mechanism for activation of the coagulation cascade. C. Deficiencies of factor VIII and IX cause highly significant coagulation abnormalities. D. Deficiencies of factor XII cause severe clinical bleeding syndromes.

Description : Which of the following statements about the coagulation cascade is/are true? A. The intrinsic pathway of coagulation is the predominant pathway in vivo for hemostasis and coagulation. ... coagulation abnormalities. D. Deficiencies of factor XII cause severe clinical bleeding syndromes.

Last Answer : Answer: AC DISCUSSION: Although it was previously held that two somewhat distinct pathways existed for the activation of the coagulation cascade, it is now recognized that the predominant ... bleeding. This further emphasizes the secondary role that the intrinsic pathway plays in coagulation

Hemostasis and the cessation of bleeding require which of the following processes? A. Adherence of platelets to exposed subendothelial glycoproteins and collagen with subsequent aggregation of platelets and formation of a hemostatic plug. B. Interaction of tissue factor with factor VII circulating in the plasma. C. The production of thrombin via the coagulation cascade with conversion of fibrinogen to fibrin. D. Cross-linking of fibrin by factor XIII.

Description : Hemostasis and the cessation of bleeding require which of the following processes? A. Adherence of platelets to exposed subendothelial glycoproteins and collagen with subsequent aggregation of platelets and ... conversion of fibrinogen to fibrin. D. Cross-linking of fibrin by factor XIII.

Last Answer : Answer: ABCD DISCUSSION: Hemostasis requires the interaction of platelets with the exposed subendothelial structures at the site of injury followed by aggregation of more platelets in that area. ... form a stable clot that incorporates the platelet plug and fibrin thrombus into a stable clot