A trickle bed reactor is the one, which (A) Has altogether three streams either entering or leaving (B) Processes three reactants at different flow rates (C) Processes three reactants with same flow rate (D) Employs all the three phases (i.e. solid, liquid and gas)

A trickle bed reactor is the one, which
(A) Has altogether three streams either entering or leaving
(B) Processes three reactants at different flow rates
(C) Processes three reactants with same flow rate
(D) Employs all the three phases (i.e. solid, liquid and gas)
by

1 Answer

Answer :

(D) Employs all the three phases (i.e. solid, liquid and gas)
by

Related questions

Hydrogenation of oil takes place in a/an __________ reactor. (A) Autothermal (B) Trickle bed (C) Plug flow (D) None of these

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Last Answer : (B) Trickle bed

A backmix reactor (A) Is same as plug-flow reactor (B) Is same as ideal stirred tank reactor (C) Employs mixing in axial direction only (D) Is most suitable for gas phase reaction

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Last Answer : (B) Is same as ideal stirred tank reactor

Pick out the wrong statement. (A) In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time (B) In a semi-batch reactor, one reactant is charged batch wise, while the other reactant is fed continuously (C) In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system (D) In a continuous flow reactor, both the reactants and the products flow out continuously

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Last Answer : (C) In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system

Semibatch reactor is preferred, when a/an (A) A highly exothermic reaction is to be controlled (B) Undesirable side reaction (at high concentration of one of the reactants) is to be avoided (C) A gas is to be reacted with liquid (e.g. hydrogenation of fat) (D) All (A), (B), and (C

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

At __________ point, all the three phases (i.e. solid, liquid and gas) co exist. (A) Eutectic (B) Triple (C) Plait (D) Critical

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Last Answer : (B) Triple

Which of the following quantities need not be fixed before starting the design of a co-current absorber? (A) Heat gain or loss (B) Flow rate of entering liquid (C) Flow rate of gas (D) None of these

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Last Answer : (B) Flow rate of entering liquid

Which of the following is not fixed by the process requirements, in the design of absorbers? (A) Flow rate of the entering gas (B) Composition of the entering liquid (C) Terminal concentrations of gas stream (D) None of these

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The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point. (A) Freezing (B) Triple (C) Boiling (D) Boyle

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Last Answer : B) Triple

Which one of the following best defines the word “allotropes”? A Different structural forms of an element B A pair of substances that differ by H+ C Elements that possess properties intermediate between those of metals and nonmetals D Atoms of a given atomic number that have a specific number of neutrons E The different phases (solid, liquid or gas) of a substance

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Last Answer : A Different structural forms of an element 

The conversion in a mixed reactor/accomplishing a reaction A → 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second. (A) 0.5 (B) 1 (C) 2(D) 3

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Last Answer : (A) 0.5

A batch reactor is suitable for (A) Achieving cent percent conversion of reactants into products (B) Large scale gaseous phase reactions (C) Liquid phase reactions(D) Obtaining uniform polymerisation products in highly exothermicreactions

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Last Answer : (C) Liquid phase reactions

A coalescer in a mixer-settler liquid-liquid extraction column (A) Comprises of thin bed of substances of extended surface having high porosity (B) Helps in increasing the bubble size entering the settler (C) Helps in increasing the settling rate of the bubbles (D) All 'a', 'b', & 'c'

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

In a semi-batch reactor (A) Velocity of reaction can be controlled (B) Maximum conversion can be controlled (C) Both the reactants flow counter-currently (D) Residence time is constant

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Last Answer : (D) A batch reactor cannot be used to study the kinetics of catalytic reaction

Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter. (A) For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the Venturimeter(B) Discharge of fluid through a Venturimeter depends upon the gagedifference irrespective of the orientation of Venturimeter(C) Venturimeter occupies less space than an orificemeter(D) Venturimeter incurs less power loss compared to an equivalentorificemeter

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Last Answer : (C) Venturimeter occupies less space than an orificemeter

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

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Last Answer : (A) Stirred tank

One of the methods of purification of leach liquor is ion exchange, which involves (A) Exchange between two liquid phases (B) Exchange between a gaseous phase and a liquid phase (C) Exchange between a liquid phase and an organic resin phase (D) Exchange between a solid phase and a gas phase

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Last Answer : Conduction band electrons have more mobility than holes because they – (1) are lighter (2) experience collision less frequently (3) have negative charge (4) need less energy to move them

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Last Answer : The presence of ozone in the stratosphere is responsible for – (1) increasing the average global temperature in recent years (2) higher rate of photosynthesis (3) checking the penetration of ultra-violet rays to the earth (4) supplying oxygen for people travelling in jets

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Last Answer : The presence of ozone in the stratosphere is responsible for – (1) increasing the average global temperature in recent years (2) higher rate of photosynthesis (3) checking the penetration of ultra-violet rays to the earth (4) supplying oxygen for people travelling in jets

What is the name of the temperature and pressure conditions at which water can be in the solid, liquid and gas phases simultaneously?

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Last Answer : ANSWER: TRIPLE POINT 

Which of the following is the most suitable for very high pressure gas phase reaction? (A) Batch reactor (B) Tubular flow reactor (C) Stirred tank reactor (D) Fluidised bed reactor

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Which of the following will give maximum gas conversion? (A) Fixed bed reactor (B) Fluidised bed reactor (C) Semi-fluidised bed reactor (D) Plug-flow catalytic reactor

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Last Answer : (C) Semi-fluidised bed reactor

Pick out the correct statement. (A) For identical gas flow rates, less pressure drop occurs through a plate tower than through a packed tower (B) Plate column can handle greater liquid loads without flooding than packed column, but the liquid hold up is more in the case of plate column (C) For the same duty, plate columns weigh less than packed columns (D) All (A), (B) and (C)

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

A heterogeneous reactor is the one, in which the moderator and the (A) Coolant are different materials (B) Coolant are present in different phases (e.g., heavy water and graphite) (C) Fuel are present in different phases (e.g. uranium and heavy water) (D) None of these

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Last Answer : (C) Fuel are present in different phases (e.g. uranium and heavy water

A fast breeder reactor (A) Utilises fast neutrons for causing fission (B) Converts fertile material (e.g., U-238) into fissile material (Pu-239) (C) Normally employs molten sodium as coolant (D) All (A), (B) and (C)

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Natality refers to (a) death rate (b) birth rate (c) number of individuals leaving the habitat (d) number of individuals entering a habitat

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An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a ____________. A. magnetic amplifier B. ship's service alternator C. three-wire DC generator D. saturable core reactor

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Last Answer : Answer: B

Solid and liquid phases of a substance are in equilibrium at the (A) Critical temperature (B) Melting point (C) Freezing point (D) Both (B) and (C)

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

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

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

A fast breeder reactor employs (A) Graphite as moderator (B) Water as coolant (C) Molten sodium as coolant as well as moderator (D) U-235 as fuel

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For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor. (A) Fixed (B) Fluidised bed reactor followed by a fixed (C) Fixed bed reactor followed by a fluidised (D) Fluidised

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Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction?(A) Ash resistance (B) Gas film and pore surface diffusion resistances for reactants (C) Surface phenomenon resistance (D) Gas film and pore surface diffusion resistances for products

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Last Answer : (A) Ash resistance

A stable interface between solid _________ liquid ____________ and gaseous ___________ promotes high rate of electrode processes. a) Fuel, electrolyte, electrode b) Electrode, fuel, electrolyte c) Electrode, electrolyte, fuel d) Fuel, electrode, electrolyte

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Last Answer : c) Electrode, electrolyte, fuel

In a continuous flow stirred tank reactor, the composition of the exit stream (A) Is same as that in the reactor (B) Is different than that in the reactor (C) Depends upon the flow rate of inlet stream (D) None of these

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Last Answer : (A) Is same as that in the reactor

The term "cooling range" in a cooling tower refers to the difference in the temperature of (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air(B) Hot water entering the tower and the wet bulb temperature of thesurrounding air(C) Hot water entering the tower and the cooled water leaving the tower(D) None of these

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Last Answer : (C) Hot water entering the tower and the cooled water leaving the tower

The term "approach" in a cooling tower refers to the difference in the temperature of the (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air (B) Hot water entering the tower and the wet bulb temperature of the surrounding air (C) Hot water entering and the cooled water leaving the cooling tower (D) None of these

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Last Answer : (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air

In a gas-liquid absorption column, for obtaining the maximum absorption efficiency (A) Liquid stream should be distributed uniformly (B) Gas stream should be distributed uniformly (C) Both gas as well as liquid streams should be distributed uniformly (D) By passing should be completely avoided

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Last Answer : (C) Both gas as well as liquid streams should be distributed uniformly

When the stopper is removed from a partly filled bottle containing solid and liquid acetic acid at 16.7 and degC a strong vinegar like odor is noticeable immediately. How many acetic acid phases must?

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A segment manager’s task is to a. decide which products enter the segment. b. verify the products entering and leaving a segment, the margin potential for those products, capacity level and the distribution system as compared to competitors. c. review margin potential for each segment and evaluate the capacity for each segment compared to the competition. d. evaluate the capacity for each segment based on total demand and the competitor’s capacity; evaluate the margin potential of all products and the distribution systems. e. none of the above.

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Last Answer : b. verify the products entering and leaving a segment, the margin potential for those products, capacity level and the distribution system as compared to competitors.

Pick out the correct statement. (A) If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase (B) A process is irreversible as long as Δ S for the system is greater than zero (C) The mechanical work done by a system is always equal to∫P.dV (D) The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

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Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in __________ in conversion. (A) Decrease (B) Increase (C) No change (D) Either (A) or (B), depends on the type of reaction

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Last Answer : (C) No change

A batch reactor is (A) Suitable for gas-phase reactions on commercial scale (B) Suitable for liquid phase reactions involving small production rate (C) Least expensive to operate for a given rate (D) Most suitable for very large production rate

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Last Answer : (B) Suitable for liquid phase reactions involving small production rate

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

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Last Answer : (B) Back-mix reactor

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

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Last Answer : (B) Bubbling bed

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

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Last Answer : (C) Dead zone

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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Last Answer : (B) Be more in PFR than in CSTR